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LIQUID-LIQUID EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM USING o-HYDROXYTHIOPHENOLS 液-液萃取-邻羟基噻吩分光光度法测定钼
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V10I8.6687
A. Zalov, K. Gavazov
{"title":"LIQUID-LIQUID EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM USING o-HYDROXYTHIOPHENOLS","authors":"A. Zalov, K. Gavazov","doi":"10.24297/JAC.V10I8.6687","DOIUrl":"https://doi.org/10.24297/JAC.V10I8.6687","url":null,"abstract":"27 liquid-liquid extraction-chromogenic systems containing Mo(VI), o-hydroxythiophenol derivative {HTPDs: 2-hydroxy-5-chlorothiophenol (HCTP), 2-hydroxy-5-bromothiophenol (HBTP) or 2-hydroxy-5-iodothiophenol (HITP)} and aromatic amine (AA) were studied. Aniline (An), N-methylaniline (mAn), N,N-dimethylaniline (dAn), o-toluidine (o-Tol), m-toluidine (m-Tol), p-toluidine (p-Tol), 3,4-xylidine (o-Xyl), 2,4-xylidine (m-Xyl), and 2,5-xylidine (p-Xyl) were the examined AAs. Optimization experiments for molybdenum extraction-spectrophotometric determination were performed and the following parameters were found for each of the systems: organic solvent (opt), pH (opt), C HTPD (opt), C AA (opt), shaking time (opt), l (max) and e (max). Under the optimum conditions, the molar ratio of the reacting Mo(V), HTPD and AA was 1:2:2 and the degrees of Mo extraction were R³98.4%. Linear relationships involving the spectral characteristics of the extracted complexes (l max or e max ) and some fundamental properties of the halogen substituent in the HTPD were discussed. The effect of foreign ions was examined and two sensitive, selective and precise procedures for extraction-spectrophotometric determination of molybdenum were proposed. The relative standard deviations for Mo content of (3-5)´10 –4 mass % were 4% (HCTP-An procedure) and 3% (HBTP-An procedure).","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"117 1","pages":"3003-3011"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81048904","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: 5
Investigation of the Effect of Natural Extract on Corrosion Behavior of Tin in Na2CO3 Solution 天然萃取物对锡在Na2CO3溶液中腐蚀行为影响的研究
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V5I3.6593
E. Azzouyahar, L. Bazzi, M. Essahli, M. Belkhaouda, L. Bammou, A. Lamiri
{"title":"Investigation of the Effect of Natural Extract on Corrosion Behavior of Tin in Na2CO3 Solution","authors":"E. Azzouyahar, L. Bazzi, M. Essahli, M. Belkhaouda, L. Bammou, A. Lamiri","doi":"10.24297/JAC.V5I3.6593","DOIUrl":"https://doi.org/10.24297/JAC.V5I3.6593","url":null,"abstract":"The inhibition effect of eugenol oil (EO) on the corrosion of tin in 0.1 M Na 2 CO 3 has been studied by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization technics. The effect of temperature on the corrosion behavior of tin in 0.1 M Na 2 CO 3 with and without addition of eugenol oil was studied in the temperature range 278-308 K. This compound inhibits the corrosion of tin at low concentration. At 4g/L eugenol oil the inhibition efficiency calculated by potentiodynamic polarization and EIS techniques is 70% and 82%, respectively. The inhibition efficiency increased with increase of the inhibitor concentration and decreased with increase of medium temperature. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition. Polarization curves reveal that EO acts as a mixed-type inhibitor in corrosive solution. The results obtained from the different corrosion evaluation techniques are in good agreement.","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"30 1","pages":"800-809"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86767822","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
The Kinetics of Electron Transfer Reaction of Methylene Blue and Titanium Trichloride in different Solvents 亚甲基蓝与三氯化钛在不同溶剂中的电子转移反应动力学
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V6I2.6583
R. Saeed
{"title":"The Kinetics of Electron Transfer Reaction of Methylene Blue and Titanium Trichloride in different Solvents","authors":"R. Saeed","doi":"10.24297/JAC.V6I2.6583","DOIUrl":"https://doi.org/10.24297/JAC.V6I2.6583","url":null,"abstract":"","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"46 1","pages":"940-957"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79142986","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: 4
Theoretical study of Aniline-Thiophene based Polymers 苯胺-噻吩基聚合物的理论研究
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V6I2.6582
P. Zamora, M. B. Camarada, F. Diaz, M. A. Valle, L. Cattin, G. Louarn, M. Soler, J. Bernède
{"title":"Theoretical study of Aniline-Thiophene based Polymers","authors":"P. Zamora, M. B. Camarada, F. Diaz, M. A. Valle, L. Cattin, G. Louarn, M. Soler, J. Bernède","doi":"10.24297/JAC.V6I2.6582","DOIUrl":"https://doi.org/10.24297/JAC.V6I2.6582","url":null,"abstract":"In this work, two kinds of novel thiophene-aniline polymers, were studied through theoretical protocols in order to find new insights about the polymerization mechanism, the chemical structure and optical properties exhibited by this kind of conducting materials. The dual descriptor—a local reactivity descriptor derived from conceptual density functional theory— and the condensed electrophilic Fukui index were used to describe the most probable sites of polymerization. Frontier orbitals energies were calculated to predict the band gap of both polymeric films. All results demonstrated how theoretical protocols help in the understanding of chemical polymerization mechanism and in the prediction of relevant properties, which can accelerate the synthesis process of new monomers.","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"1 1","pages":"982-989"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89849010","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
Structural and Electrical properties of ZnO Nanorod based dye sensitized solar cell ZnO纳米棒染料敏化太阳能电池的结构与电学性能
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V12I8.6096
R. Krithivasan, S. Brahadeeswaran, K. Santha, S. Krishnan
{"title":"Structural and Electrical properties of ZnO Nanorod based dye sensitized solar cell","authors":"R. Krithivasan, S. Brahadeeswaran, K. Santha, S. Krishnan","doi":"10.24297/JAC.V12I8.6096","DOIUrl":"https://doi.org/10.24297/JAC.V12I8.6096","url":null,"abstract":"","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"95 1","pages":"4275-4280"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83499472","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
Homocysteine and Asymmetric Dimethylarginine (ADMA) in Neurological Diseases 同型半胱氨酸和不对称二甲基精氨酸(ADMA)在神经系统疾病中的作用
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V6I2.6584
J. Dorszewska, Anna Oczkowska, M. Lianeri, W. Kozubski
{"title":"Homocysteine and Asymmetric Dimethylarginine (ADMA) in Neurological Diseases","authors":"J. Dorszewska, Anna Oczkowska, M. Lianeri, W. Kozubski","doi":"10.24297/JAC.V6I2.6584","DOIUrl":"https://doi.org/10.24297/JAC.V6I2.6584","url":null,"abstract":"Homocysteine (Hcy) is formed from methionine (Met) and is distributed in two metabolic pathways: in the process of remethylation to Met and in the process of transsulfuration to cysteine. Hyperhomocysteinemia (HHcy) is a risk factor for cardiovascular and neurological diseases such as: Alzheimer’s and Parkinson’s diseases, multiple sclerosis, and stroke. Increased Hcy level may lead to endothelial dysfunction due to impaired bioavailability of endothelium-derived nitric oxide (NO). The molecular mechanism decreasing the levels of NO in HHcy conditions is incompletely understood, but it seems that asymmetric dimethylarginine (ADMA), an endogenous inhibitor of NO synthase, may be a key factor. ADMA is formed from L-arginine by enzymes in the family of protein N-methyltransferases (PRMT) and may undergo hydrolysis to L-citrulline and dimethylamine with the participation of dimethylaminohydrolase (DDAH). In pathological conditions such as neurodegenerative diseases, Hcy may lead to increased ADMA concentrations by inhibiting the activity of DDAH. Several drugs, such L-dopa, antiepileptic drugs, and lipid-lowering drugs, may interfere with the metabolic pathways of thiols, leading to an alteration of plasma Hcy and ADMA levels. It seems that administration of L-arginine, in conjunction with B vitamins, to patients with HHcy may be a new method in the treatment of neurodegenerative diseases.","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"8 1","pages":"931-939"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78801679","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
THE INHIBITION AND ADSORPTION PROPERTIES OF DTPMP – TSC ON STAINLESS STEEL IN ACIDIC MEDIUM DTPMP - TSC在酸性介质中对不锈钢的缓蚀和吸附性能
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/jac.v6i1.6588
P. S. Kumar
{"title":"THE INHIBITION AND ADSORPTION PROPERTIES OF DTPMP – TSC ON STAINLESS STEEL IN ACIDIC MEDIUM","authors":"P. S. Kumar","doi":"10.24297/jac.v6i1.6588","DOIUrl":"https://doi.org/10.24297/jac.v6i1.6588","url":null,"abstract":"","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"106 1","pages":"887-908"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80371931","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
Magnetic Solid Phase Extraction of Au(III) using Fe3O4 Nanoparticles Prior to its Flame Atomic Absorption Spectrometric Determination Fe3O4纳米颗粒在火焰原子吸收光谱测定前的磁固相萃取金(III
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V6I2.6581
Z. M. Khoshhesab
{"title":"Magnetic Solid Phase Extraction of Au(III) using Fe3O4 Nanoparticles Prior to its Flame Atomic Absorption Spectrometric Determination","authors":"Z. M. Khoshhesab","doi":"10.24297/JAC.V6I2.6581","DOIUrl":"https://doi.org/10.24297/JAC.V6I2.6581","url":null,"abstract":"A simple solid phase extraction procedure has been proposed for determination of Au(III) based on separation and preconcentration using magnetite nanoparticles (MNPs) prior to its determination by flame atomic absorption spectrometry. The influences of experimental parameters including sample pH, sorbent mass, contact time, volume and type of eluent, and interference of some ions with extraction of Au(III) ions were investigated using batch procedure. The maximum adsorption capacity of the sorbent for Au(III) was found to be 45.0 mg g-1. The sorption of Au(III) ions was quantitative in the pH range of 4.0–5.0 and quantitative desorption was achieved using 10 mL of thiourea (0.5 mol L-1)/hydrochloric acid (1 mol L-1) solution. In the initial solution, the calibration curve was linear in the range of 8.8 - 666.0 I¼g L-1 with R2 = 0.9994 (n = 8), the detection limit (3Sb, n = 8) was 6.2 I¼g L-1, relative standard deviation (R.S.D) of 20 I¼g mL-1 of Au(III) was 3.9% (n = 8), and the preconcentration factor was 30. The proposed method has been applied to the determination of Au(III) in water and wastewater samples with good recoveries in the range of 95% –103%.","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"69 1","pages":"990-998"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76230809","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
Kinetic Study of the Dissolution of Tunisian Natural Phosphate or Francolite in Industrial Phosphoric Acid 突尼斯天然磷酸盐或方铅矿在工业磷酸中溶解动力学研究
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-24 DOI: 10.24297/JAC.V6I1.6585
A. Chaabouni
{"title":"Kinetic Study of the Dissolution of Tunisian Natural Phosphate or Francolite in Industrial Phosphoric Acid","authors":"A. Chaabouni","doi":"10.24297/JAC.V6I1.6585","DOIUrl":"https://doi.org/10.24297/JAC.V6I1.6585","url":null,"abstract":"A kinetic study of dissolution of Tunisian natural phosphate or francolite whose particles have a mesoporous texture in industrial phosphoric acid is carried out. Therefore, We focused on the study of the influence of certain parameters that are close to those used in plants producing phosphoric acid which are the stirring speed (300, 500 and 700 rounds per minute), concentration of phosphoric anhydride (25, 30 and 35 percent of P 2 O 5 ), and the temperature (60, 70 and 80 degrees Celsius); we note that the rate of dissolution of this phosphate rises by increasing the precedent parameters. Because of the complexity of the study of the dissolution of phosphate in mineral acids. Several different published kinetic models giving different expressions of speed versus time. The shrinking core model is the appropriate model used in our work in a solution where there is no calcium sulfate to calculate the rate constant k and the activation energy E a  = 3.3946 Kcal/mol of this phosphate.","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"2 1","pages":"908-916"},"PeriodicalIF":0.0,"publicationDate":"2017-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81280250","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: 12
Investigation of using bleaching earth and activated carbon mixturein sunfloweroilrefining 漂白土与活性炭混合物在葵花籽油精制中的应用研究
JOURNAL OF ADVANCES IN CHEMISTRY Pub Date : 2017-04-20 DOI: 10.24297/JAC.V13I12.5972
Guliyev Nihad Gudret, Ibrahim Jamal, Alekperov Jamil Arif, A. Ali, Ibrahimova Zenfira Meherrem
{"title":"Investigation of using bleaching earth and activated carbon mixturein sunfloweroilrefining","authors":"Guliyev Nihad Gudret, Ibrahim Jamal, Alekperov Jamil Arif, A. Ali, Ibrahimova Zenfira Meherrem","doi":"10.24297/JAC.V13I12.5972","DOIUrl":"https://doi.org/10.24297/JAC.V13I12.5972","url":null,"abstract":"Adsorption is one commonly used technique for treatment of sunflower oil. In this study, activated carbon and bleaching earth as a bleaching agent mixed with certain proportions and1% of the mixture added to sunflower oil in the bleaching process. The combination of bleaching earth and activated carbon produced higher adsorption capacity than the single bleaching earth. This article focuses more particularly on heavy metals and polycyclic aromatic hydrocarbons (PAHs) removal. It was detected that, the mixture is an excellent adsorbent in the adsorption of PAHs and metals from sunflower oil with the highest adsorption capacity. The results showed that, the adsorption of metals and PAHs depend strongly on activated carbon and decreased with increasing activated carbonin mixture and the maximum adsorption was reached after using B5 (95 % bleaching earth and 5 % activated carbon combination).","PeriodicalId":14904,"journal":{"name":"JOURNAL OF ADVANCES IN CHEMISTRY","volume":"14 1","pages":"5932-5936"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89986796","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
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