Subjects -> CHEMISTRY (Total: 928 journals)
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CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 32)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 15)
ACS Catalysis     Hybrid Journal   (Followers: 57)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 26)
ACS Combinatorial Science     Hybrid Journal   (Followers: 13)
ACS Environmental Au     Open Access   (Followers: 10)
ACS Macro Letters     Hybrid Journal   (Followers: 29)
ACS Materials Letters     Open Access   (Followers: 7)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 45)
ACS Nano     Hybrid Journal   (Followers: 223)
ACS Photonics     Hybrid Journal   (Followers: 16)
ACS Symposium Series     Full-text available via subscription   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 38)
Acta Chemica Malaysia     Open Access   (Followers: 2)
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 4)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 12)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 13)
Advanced Functional Materials     Hybrid Journal   (Followers: 76)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 4)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 131)
Advances in Chemical Science     Open Access   (Followers: 52)
Advances in Chemistry     Open Access   (Followers: 37)
Advances in Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 13)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 34)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 49)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Sample Preparation     Open Access   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Aerosol Science and Engineering     Hybrid Journal   (Followers: 2)
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 2)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 8)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 45)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 21)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 169)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 275)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 20)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 8)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 248)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 24)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 85)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 61)
Bioorganic Chemistry     Hybrid Journal   (Followers: 7)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 25)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 11)
Carbohydrate Research     Hybrid Journal   (Followers: 23)
Carbon     Hybrid Journal   (Followers: 64)
Carbon Capture Science & Technology     Open Access   (Followers: 1)
Carbon Trends     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 12)
Cell Reports Physical Science     Open Access   (Followers: 1)
Cellulose     Hybrid Journal   (Followers: 8)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal   (Followers: 7)
Chem Catalysis     Hybrid Journal   (Followers: 1)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 83)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Physics Impact     Full-text available via subscription   (Followers: 1)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 212)
Chemical Science     Open Access   (Followers: 43)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 4)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 39)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 18)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 19)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 7)
Chemistry Education Review     Open Access   (Followers: 2)
Chemistry in Education     Open Access   (Followers: 5)
Chemistry Letters     Full-text available via subscription   (Followers: 43)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 5)
Chemistry of Materials     Hybrid Journal   (Followers: 186)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 3)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 21)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)

        1 2 3 4 | Last

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Journal Cover
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences
Number of Followers: 0  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2414-0597
Published by Mongolia Journals Online Homepage  [5 journals]
  • Editorial - No.9, 2021

    • Authors: Jargalsaikhan Lkhasuren
      Pages: i - ii
      Abstract: No in English
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1809
  • Optimization of electrocoagulation condition for the removal of As(V) ions
           from aqueous media

    • Authors: Amarsanaa Altangerel, Damdin Nomin-Erdene, Davaasambuu Sarangerel
      Pages: 1 - 9
      Abstract: In recent years, the arsenic content of groundwater and soil due to the mining processes and natural and/or anthropogenic sources exceeds the permissible level, leading to adverse effects on human health and the ecosystem. The paper provides the optimized condition for the arsenic removal from the aqueous media using electrocoagulation, which is no additional reagents/chemicals, in situ generation of coagulants continuously, low energy consumption. The optimal conditions were found to be as follows: pH 7, electrolyte concentration NaCl 0.5 g L-1, current density 20 mA cm-2, and operational time 20 minutes, initial concentration of arsenic 50 mg L-1. Under the optimal condition, the maximum removal efficiency was 99.6%. Generally, the experimental results showed that the removal efficiency of As(V) from the aqueous medium was higher than 95% at pH = 4-8 ranges, 90% at the electrolyte concentration in the range of 0.25 g L-1 to 0.75 g L-1 , and 96% at the current density in the range of 15
      mA cm-2 - 60 mA cm-2 respectively. Considering the variation of oxidation-reduction potential and pH during the electrocoagulation and FTIR spectra of solid residue, we found that As(V) was removed through the chemical precipitation (FeAsO4) and adsorption (Fe(OH)3×HAsO42-). Усан орчноос As(V) ионы агуулгыг бууруулах электрокоагуляцийн зохистой нөхцөлийг тогтоох судалгаа Хураангуй: Сүүлийн жилүүдэд эрдэс түүхий эдийн олборлолт, арсен агуулсан эрдэс чулуулгийн өгөршилөөр гадаргын болон гүний усан дахь арсены (As) агуулга хүлцэх агууламжаас ихсэх тохиолдлууд гарч байна. Энэ судалгааны ажлаар коагулянтаа орчинд нь тасралтгүй үүсгэдэг, нэмэлт урвалж шаарддаггүй, цахилгааны зарцуулалт багатай электрокоагуляцийн аргаар усан уусмал дахь As(V)-ыг тунадасжуулах зохистой нөхцөлийг тогтоох ажлыг хийж, үр дүнг спектрофотометр, индукцийн холбоост плазм-масс спектрометр, потенциометрийн аргаар тодорхойллоо. Зохистой нөхцөлийг тодорхойлох туршилтын дүнгээс харахад, усан орчноос As(V)-ын тунадасжуулалт рН=4-8-ын утганд >95%, электролит&...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1811
  • Synthetic fatty acids from solid paraffin of Tsagaan-Els oil deposit

    • Authors: Byambasuren Gantsetseg, Bayanmunkh Myagmargerel, Murneren Tuya, Bayasgalan Khulan, Batchuluun Khongorzul
      Pages: 10 - 16
      Abstract: In this work, fatty acids, the raw materials for detergents, were obtained by the oxidation reaction of solid paraffin
      extracted from the Tsagaan-Els petroleum deposit of Mongolia. The oil fraction distilled from the crude oil at 350-450°C was 20.06 mass %, and the solid paraffin was extracted from the oil fraction by complexation with urea with a yield of 34.28 %. Extracted solid paraffin contained hydrocarbons of C17-C34 and was unimodal in molecular mass distribution. Optimal conditions for the oxidation reaction of solid paraffin extracted from the oil fraction were determined by mathematical modeling depending on various reaction parameters and found to be 0.6 l/min for catalyst amount and 0.1 mass % (from paraffin) for oxygen flow. The oxidation reaction of solid paraffin extracted from the Tsagaan-Els petroleum deposit resulted in a fraction of synthetic fatty acid with a yield of 44.09
      mass %. Infrared spectroscopic analysis of the synthetic fatty acids revealed that oxygen-containing compounds formed from the reaction were predominantly monocarboxylic acids and GC-MS studies have shown that these fatty acids are synthetic fatty acids containing carbon atoms of C7-C26. We report that it is possible to oxidize the solid paraffin of petroleum in our country to produce synthetic fatty acids, which are widely used in detergent production. Цагаан-Элсний ордын нефтийн хатуу парафинаас нийлэг тосны хүчил гарган авах Хураангуй: Энэхүү ажлын хүрээнд Монгол орны Цагаан-Элсний ордын нефтийн хатуу парафиныг исэлдүүлэн
      гадаргуугийн идэвхт үйлчлэлтэй угаагч бодисын гол түүхий эд болох нийлэг тосны хүчил гарган авах судалгааг явуулсан. Судлагдаж буй нефтийн 350-450°C-д нэрэгдэх тосны фракц нь 20.06 мас.% -ийг эзлэх бөгөөд тосны фракциас карбамидаар комплекс үүсгэх замаар хатуу парафиныг 34.28 хувийн гарцтайгаар ялган авав. Хатуу парафин нь найрлагандаа С17–С34 бүхий нүүрстөрөгчийн атом агуулсан, молекул массын тархалтаараа унимодаль шинжтэй байв. Нефтийн тосны фракцаас ялгасан н-парафиныг молекул хүчилтөрөгчөөр исэлдүүлэх процессын зохимжтой горимыг янз бүрийн параметрүүдээс
      хамааруулан м...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1813
  • Some results of studies on leaching of toxic elements in Asgat
           polymetallic concentrate

    • Authors: Garnaad Ariunaa, Gunchin Burmaa, Shirchinnyamjil Nyamdelger, Batnasan Altansukh, Muratbek Nazgul, Tumen-Ulzii Narangarav
      Pages: 17 - 25
      Abstract: Extended ICP-OES and AAS analysis of floated polysulphide concentrate from the Asgat polymetallic ore revealed that the concentrate contains 0.91% of silver, 18.2% of copper, 19.4% antimony, 2.03% arsenic and 1.6% of bismuth together with other elements. The prevailing minerals in the concentrate are tetrahedrite, bismuthinite, chalcopyrite, arsenopyrite and pyrite and non-ore minerals i.e. siderite, muscovite and quartz. The content of above minerals was estimated by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analysis. An optimum condition for antimony leaching from the tetrahedrite by alkaline-sulphide solution was studied comprehensively. In optimized condition, the 99.25% of Sb, 89.0% of As and 44.50% of Bi were dissolved from the concentrate into the alkaline-sulphide solution, successfully. The solid residue contains non-ore sulphide minerals as well as chalcopyrite (CuFeS2), covellite (CuS), chalcocite (Cu2S), pyrite (FeS) and argentite (Ag2S). Chalcopyrite and pyrite are not soluble in alkaline-sulphide solution. The covellite and chalcocite are the product of tetrahedrite decomposition. The activation energy for antimony leaching from the tetrahedrite by alkaline-sulphide solution was calculated as 81.43kJ/mol that indicates the leaching process occurred by chemical reaction. Асгатын полиметаллын баяжмал дахь хортой элементүүдийг уусгах аргаар ялгаж авах судалгааны зарим үр дүн Хураангуй: Асгатын полиметаллын хүдрийг флотацийн аргаар баяжуулан гаргаж авсан полисульфидын баяжмалд 0.91% мөнгө, 19.20% зэс, 19.40% сурьма, 2.03% хүнцэл, 1.60% висмут болон бусад дагалдах элемент агуулагдаж байгааг атом шингээлтийн (AAS) болон индукцийн холбоот плазмын спектроскоп (ICP-OES)-ын аргуудаар тодорхойлсон. Баяжмалын эрдэс бүрдлийн найрлагыг рентгендифрактометр (XRD), электрон микроскоп, энергийн сарнилын спектрометр (SEM-EDS)-ийн аргуудаар тодорхойлоход тетраэдрит, висмутин, халькопирит, арсенопирит, пирит зэрэг үндсэн эрдсүүдээс гадна сидерит, мусковит, кварц зэрэг хүдрийн бус эрдсүүд агуулагдаж байв. Баяжмалыг шүлт-сульфидын (Na2S+NaOH) холимогт уусгаж, хортой бүрдэл болох &#...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1814
  • Effect of inherent minerals on Na catalyzed gasification activity of
           Tavantolgoi coal

    • Authors: Tuvdendorj Baasanjargal, Byamba Bum-Ayush, Byambajav Enkhsaruul
      Pages: 26 - 32
      Abstract: Steam gasification of weathered (deposit overlay) and energy (depth of ≥300 m) coal samples of Tavantolgoi deposit situated in Tsogttsetsii soum, Umnugovi aimag were performed in this study. Relationship between coal inherent minerals and catalysts (Fe, Na, binary Fe-Na) in the gasification was investigated in a flow of Ar and steam (1:1) mixture with a rate of 200ml/min at temperature of 800°C for 1h using a fixed bed stainless reactor. Conversion of organic matter was 81.8% for the weathered coal sample, and 21.5% for the energy coal sample during non-catalytic gasification of Tavantolgoi coal. Large amount of inherent calcium minerals included in the weathered coal showed a catalytic effect on gasification activity. However, these minerals reacted actively with sodium catalysts (Na or binary Na-Fe) in stages of pyrolysis and gasification, consequently the catalysts lost their activities. Moreover, Fe ore did not have influence of catalyst in steam gasification of both weathered and energy coal samples. Moreover, an inherent Ca content of the energy coal sample was 10 times smaller than that of weathered coal sample. Gasification activity of the energy coal increased significantly with Na catalyst, and the amount of syngas increased 4.6 times compared to that evolved in noncatalytic gasification of the energy coal. Тавантолгой ордын нүүрсний натри, төмөр катализатортай хийжүүлэлтийн идэвхэд эх эрдсийн үзүүлэх нөлөө Хураангуй: Энэхүү судалгааны ажлаар Өмнөговь аймгийн Цогтцэций сумын нутагт орших Тавантолгойн ордын овоолгын исэлдсэн нүүрс болон 300 метрээс доош гүнд байрлах эрчим хүчний чулуун нүүрсний хийжүүлэлтийн идэвхэд эх эрдсүүдийн нөлөө, мөн Fe, Na болон хосолсон Fe+Na катализаторуудын үзүүлэх нөлөөг тодорхойлох туршилтыг хийж гүйцэтгэв. Тавантолгойн ордын чулуун нүүрсний уурын хийжүүлэлтийн идэвхийн туршилтыг хөдөлгөөнгүй үет ган реакторт, 800ºС температурт, 200 мл/мин урсгал хурдтай аргон хий ба усны уурын 1:1 молийн харьцаа бүхий хийн холимогоор 1 цагийн турш хийжүүлсэн. Катализаторгүй үед Тавантолгойн исэлдсэн нүүрсний органик массын хувирал нь 81.8%, эрчим хүчний...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1815
  • Water quality analysis of tuul river around the Ulaanbaatar city area

    • Authors: Battulga Daariimaa, Gombosuren Odontuya, Andarai Tsiiregzen, Dolgorjav Oyuntsetseg, Amarjargal Ichinnorov, Ganpurev Dulamsuren, Zolboot Buyanjargal, Otgonbaatar Khureldavaa, Badgaa Amarsanaa
      Pages: 33 - 39
      Abstract: This study purposed to evaluate the water quality of 10 points located between the Terelj national park and the Lun soum in Tuv province along the Tuul River, depending on assessing detailed Physico-chemical and seasonal (except than winter) pollution indicators. The chemical data of water samples from the Tuul River illustrated the water type from neutral to slightly alkaline and belonged to the HCO3-- Ca2+; HCO3-, SO42--Na+ and HCO3-- Ca2+, Mg2+. The point of Terelj or, moreover, starting points water belongs to excellent water, but water mineralization in the mid of Ulaanbaatar city increased up to 1.2 times. However, mineralization, anions and cations of T6 mixed with wastewater from the Central Wastewater Treatment Plant (CWTP) increased significantly. These parameters decreased along the downstream river at T9, T10 points in the zone of Lun soum. As nutritional polluting constituents like NH4-N, NO2-N, PO4-P, COD concentrations met the permissibility of National Standard (MNS 4586:98) requirements at T1-T5 points in Terelj and Ulaanbaatar city. On the contrary, ranges are overrated by permissible concentration of MNS 4586:98 at T6 point mixed with wastewater from CWTP. In T9, T10 points case, nutritional pollution is being decreased gradually along the river, but natural self-treatment did not process completely. Water quality index (WQI) of Terelj and mid of the city (T1-T5 points) designated as ‘excellent’ and ‘good’ (I-II), inappropriately at the point T6 appointed as ‘very poor’ to ‘unsuitable’ water (IV-V) categories. Interestingly, T7 to T10 issues contributed as ‘poor’ to ‘very poor’ water (III-IV) categories. Улаанбаатар хот орчмын Туул голын усны чанарын судалгаа Хураангуй: Туул голын урсгалын дагуу Тэрэлжээс Төв аймгийн Лүн сум хүртэлх 10 цэгээс улирал тутам дээж цуглуулан физик-химийн болон бохирдлын үзүүлэлтийг тодорхойлон, усны чанарын судалгааг явуулсаны үндсэн дээр бохирдлын түвшинг тогтоон дүгнэлт өгөх зорилгоор энэхүү ажлыг хийж гүйцэтгэсэн болно. Туул голын ус нь саармагаас бага шүлтлэг орчинтой, HCO3-- Ca2+; HCO3-, SO42--Na+ ; HCO3-- Ca2+, Mg2+. төрлийн холимог найрлагатай усны ангилалд хамаарагдаж байна. Голын эх буюу Тэрэлжийн бүс нэн цэнгэг усны ангилалд хамаарагдаж байсан бол Улаанбаатар хот орчмын бүсийн голын усны эрдэсжилт ойролцоогоор 1.2 дахин нэмэгдсэн байна. Харин Төв цэ&#...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1816
  • Evaluation of biological activity and toxicity of extracts from Cuscuta

    • Authors: Janchivmaa Dorjbat, Myagmarsuren Byambadolgor, Baatarkhuu Amarjargal, Bazarvaani Nasantogtokh, Jigmed Sukhdolgor, Damdindorj Lkhagvasuren, Tuvaanjav Suvdmaa
      Pages: 40 - 46
      Abstract: As the world's population grows, so do the many infectious and non-communicable diseases that follow, and there is an urgent need to find ways to treat and cure them. In particular, it is very important to study low-toxic, highly therapeutic substances from natural raw materials such as plants, animals and microorganisms and introduce them for use as medicines and food supplements. In our study, we studied the chemical composition of Cuscuta chinensis grown in Mongolia and obtained a group of extracts to determine the DPPH free radical inhibitory activity and calculated the IC50 value for hexane extract 32.09 μg/ml, chloroform extract 31.35 μg/ml, ethyl acetate extract 7.23 μg/ml, n-butanol extract 53.35 μg/ml, aqueous extract 84.46 μg/ml, and chloroform extract S.aureus, P.aeruginosa, B.subtilis, ethyl-acetate extract S.aureus, P.aeruginosa, B.subtilis, E.faecalis were active in inhibiting the growth of bacteria. Also evaluated toxicity of extracts for Brine shrimp lethality assay. Нангиад ороонго (Cuscuta chinensis Lam)-ын биологийн идэвх, хорон чанарын судалгаа Хураангуй: Бид судалгаандаа Монгол оронд ургадаг Нангиад ороонго /Cuscuta chinensis/-ын химийн найрлагыг судлан, бүлэг хандуудыг гарган авч, DPPH чөлөөт радикал саатуулах идэвхийг тодорхойлон IC50 утгыг тооцоход гексаны ханд 32.09 мкг/мл, хлороформын ханд 31.35 мкг/мл, этил-ацетатын ханд 7.23 мкг/мл, н-бутанолын ханд 53.35 мкг/мл, усан ханд 84.46 мкг/мл утгатай буюу бусад бүлэг хандаас этил-ацетатын ханд нь хамгийн өндөр идэвхтэй, бактерийн эсрэг идэвхийг тодорхойлоход хлороформын ханд Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus subtilis, этил-ацетатын ханд S.aureus, P.aeruginosa, B.subtilis, Enterococcus faecalis бактериудын өсөлтийг дарангуйлах идэвхтэй байв. Мөн хорон чанарыг Artemia salina хавчийн авгалдайд 1 мг/мл, 100 мкг/мл, 10 мкг/мл, 1 мкг/мл концентрацтайгаар тодорхойлон, LC50 утгыг тооцож Кларксоны хорон чанарын индексээр үнэлэхэд н-бутанолын ханд 1619.4 мкг/мл, усан ханд 1888.5 мкг/мл буюу хоргүl...
      PubDate: 2021-12-30
      DOI: 10.5564/bicct.v4i9.1817
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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