Chemical Problems最新文献_第4页

CHEMOMETRIC ANALYSIS OF THE WATER OF SITNICA RIVER 锡尼察河水的化学计量学分析

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-305-316

V. Limani Hajnuni

{"title":"CHEMOMETRIC ANALYSIS OF THE WATER OF SITNICA RIVER","authors":"V. Limani Hajnuni","doi":"10.32737/2221-8688-2022-3-305-316","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-305-316","url":null,"abstract":"The purpose of this study is to determine the water quality of the Sitnica river through the research and determination of some physico-chemical parameters of this water and the degree of pollution with heavy metals and various effluents along the entire flow of the river, within the borders of Republic of Kosovo. The geographical positions of sampling spots were determined by GPS, make GARMIN GEKO, 12 сhannel. The number of sampling spots is 9, and samples in every sampling spot were taken to determine the chemical parameters.The tracking of heavy materials is done through the ICP-MS and ICP-OES method. Following the results of our analyses it found that the temperature is almost unchanged and it is between 11.5 and 12 degrees. Electrical conductivity, starting from the spring, is increasing and it reaches the maximum rate (840 μS/cm) at point S5 (Palaj) as a consequence of industrial water spill and other anthropogenic polluters and again after that it starts to drop down along the flow of the river. The pH of water is between 7.83 in S1(Jezerc) and 8.6 in S3 (Lipjan). The turbidity is also increasing in S5. Total hardness reaches the maximum rate in S4 (Lismir), but it drops again, while the alkalinity reaches the maximum rate in S5. At sampling spot S4, metals Ni, Co, Si, Zn are noted for the maximum concentration comparing to other points, except in sampling spot S9(Mitrovica), where the rate is over 250 μg/dm3 . At the sampling point S9, the maximum content of cadmium is observed, at the point S2( Rubovich) - iron, at the point S1 – chromium. According to the performed chemical analysis, it can be concluded that the pollution of the Sitnitsa River is caused by anthropogenic sources, especially at sampling points S4, S5, S6 (Plemetin) and S9. Namely, where the river Drenica flows into Sitnica, which carries the industrial waters of the ferronickel plant (S4), then S5 and S6, where industrial waters come from thermal plants, and S9, where industrial waters come from the ore smelter in Mitrovica.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90760497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

IR SPECTRA STUDY: ADVANTAGES OF METHANOL VAPOR FEEDING FOR NAFION® MEMBRANE STRUCTURE 红外光谱研究:甲醇蒸汽进料对nafion®膜结构的优势

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-297-304

D. D. Spasov, R. M. Mensharapov, N. A. Ivanova, V. Fateev

引用次数: 0

INTERACTION OF COBALT AND MANGANESE NITRATES WITH GRAPHITE UNDER HYDROTHERMAL CONDITIONS 水热条件下硝酸钴和硝酸锰与石墨的相互作用

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-1-35-39

A. A. Mammadova

引用次数: 0

RECYCLING SLAG FROM COMBUSTION OF MSW INTO COMPLEX MINERAL FERTILIZERS USING POOR PHOSPHORITE 将城市生活垃圾燃烧产生的炉渣利用差磷矿转化为复合矿质肥料

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-2-138-144

S. A. Geraybeyli

引用次数: 0

INVESTIGATION OF THE ISOMERIZATION REACTION OF BUTENE-1 TO BUTENES-2 ON BINARY TUNGSTEN-CONTAINING CATALYSTS 丁烯-1与丁烯-2在二元含钨催化剂上异构化反应的研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-256-263

K.X. Aghayeva, V. Baghiyev

{"title":"INVESTIGATION OF THE ISOMERIZATION REACTION OF BUTENE-1 TO BUTENES-2 ON BINARY TUNGSTEN-CONTAINING CATALYSTS","authors":"K.X. Aghayeva, V. Baghiyev","doi":"10.32737/2221-8688-2022-3-256-263","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-256-263","url":null,"abstract":"The activity of tungsten-containing catalysts in the reaction of isomerization of butene-1 to butenes-2 was studied in the work. The results obtained showed that the ^ introduction of the second element into the composition of the tungsten oxide catalyst had a different effect on its activity in the butene-1 isomerization reaction. It was established that an increase in the amount of molybdenum in the composition of a binary tungsten-containing catalyst at low temperatures leads to a decrease in the degree of butene-1 isomerization while at high temperatures it leads to an increase in the rate of butene-1 isomerization. It found that the addition of titanium to the composition of the tungsten oxide catalyst leads to an increase in the butene-1 isomerization rate. When copper is added to the composition of the tungsten oxide catalyst, the total yield of butene-2 passes through a maximum, and on samples rich in copper, the isomerization of butene-1 practically does not occur. It revealed that the activity of binary tungsten oxide catalysts in the isomerization reaction of butene-1 to butenes-2 changes in the following order: Ti-W-O > Mo-W-O > Cu-WO.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87694863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

BIOSTABLE LUBRICANT COMPOSITION FOR MARINE, LOCOMOTIVE AND STATIONARY DIESELS 船用、机车和固定式柴油机用生物稳定润滑油组合物

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-242-248

Y. B. Ramazanova

引用次数: 0

PHASE COMPOSITION AND OXIDATION DEGREE OF VANADIUM IN CATALYSTS FOR OXIDATIVE DEHYDROGENATION OF PROPANE 丙烷氧化脱氢催化剂中钒的相组成及氧化程度

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-358-365

А.М. Sardarly

引用次数: 1

BIOCIDAL ACTIVITY OF AMINOMETHYL DERIVATIVES OF 2-MERCAPTOBENZOXAZOLE 2-巯基苯并恶唑胺甲基衍生物的杀生活性

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-366-373

L. Safarova

{"title":"BIOCIDAL ACTIVITY OF AMINOMETHYL DERIVATIVES OF 2-MERCAPTOBENZOXAZOLE","authors":"L. Safarova","doi":"10.32737/2221-8688-2022-3-366-373","DOIUrl":"https://doi.org/10.32737/2221-8688-2022-3-366-373","url":null,"abstract":"The biocidal activity of the aminomethyl derivatives of 2-mercaptobenzoxazole synthesized by us and being of interest as potential antimicrobial additives to petroleum products and cutting fluids, was studied. The aminomethylation reaction proceeded with the participation of methylene-bis-amines. As a result, the appropriate N-substituted benzoxazolin-2-thiones were obtained. Their structure was proved by NMR 1H. Due to the poor solubility of the synthesized compounds in petroleum products, their salts with petroleum naphthenic acid were obtained for microbiological testing. The results of tests in lubricating oil M-8 show that the naphthenic salts of the synthesized compounds exhibit biocidal activity and their fungicidal properties are higher than bactericidal ones. The petroleum naphthenic acid used in the test in its pure form in the composition of the M-8 lubricating oil is not biostable and is affected by microorganisms. N-piperidinomethylbenzoxazolin-2-thione in the composition of the coolant proved to be a biocide, and its bactericidal properties are higher than fungicidal ones. The results of a microbiological study of an aqueous solution of this compound showed high bactericidal properties in the absence of effectiveness against mold fungi.","PeriodicalId":10015,"journal":{"name":"Chemical Problems","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81797117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SUPERBASES IN ORGANIC SYNTHESIS 有机合成中的超碱

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-325-340

B. Trofimov, E. Schmidt

引用次数: 0

PREPARATION OF HYDROXYAMINO DERIVATIVES OF POLYCYCLIC BRIDGING HYDROCARBONS AND THEIR ANTIMICROBIAL PROPERTIES 多环桥接烃羟基氨基衍生物的制备及其抗菌性能研究

Chemical Problems Pub Date : 2022-01-01 DOI: 10.32737/2221-8688-2022-3-271-276

M.B. Alaskarova

引用次数: 0