Challenges and Advances in Chemical Science Vol. 4最新文献

The Calculation of the Stability Constant of Nickel Fulvate, using an Average Molecular Weight of Active Associate of Fulvic Acids at pH = 8 利用pH = 8时黄腐酸活性缔合物的平均分子量计算黄腐酸镍的稳定常数

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/10399d

T. Makharadze, G. Makharadzé

{"title":"The Calculation of the Stability Constant of Nickel Fulvate, using an Average Molecular Weight of Active Associate of Fulvic Acids at pH = 8","authors":"T. Makharadze, G. Makharadzé","doi":"10.9734/bpi/cacs/v4/10399d","DOIUrl":"https://doi.org/10.9734/bpi/cacs/v4/10399d","url":null,"abstract":"Fulvic acids play an important role in complicated formation processes and determine how heavy metals migrate in natural waterways. Despite investigation, experimental data on the stability constants of complex fulvic acid-heavy metal complexes (including nickel) is heterogeneous and differs in various ways from one another. One of the sources of this problem is the failure to consider the average molecular weight of fulvic acid partners, which leads to incorrect results. The solubility method was used to investigate the complex formation process between Ni (II) and fulvic acids at pH=8.0. The suspension of Ni(OH)2 was used as a solid phase. The adsorption–chromatographic approach was used to separate fulvic acids from Paravani Lake. The active charcoal was used as a sorbent. In this chapter is shown that, during complex formation process every 0,29 part of an associate of fulvic acids(Mw=6260), inculcates into nickel’s inner coordination sphere as an integral ligand, so it may assume, that the average molecular weight of the associate of fulvic acids which takes part in complex formation process equals to 1815. This component of the fulvic acid association was previously referred to as a \"active associate.\".The average molecular weight of the “active associate” was used for determination the composition of nickel dyhydroxo fulvate complex (1:1), the concentration of free ligand and average stability constant, which equals to (beta) = 7,95x105; lg (beta)=5,90","PeriodicalId":9826,"journal":{"name":"Challenges and Advances in Chemical Science Vol. 4","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73332932","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

Research on Adsorption of Chromium (VI) from Wastewater by Anion Exchange Resin 阴离子交换树脂吸附废水中六价铬的研究

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/9843d

J. Rashid, M. Barakat, M. Alghamdi

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Determination of Thermal Runaway in Sealed Nickel-Cadmium Batteries 密封镍镉电池热失控的测定

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/11821d

N. Galushkin, N. Yazvinskaya, D. Galushkin

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Study on Synthesis, Characterization and Applications of Ternary Metal Complexes 三元金属配合物的合成、表征及应用研究

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/3157f

A. Faheim

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Study on Spectrophotometric Determination of Uranium in Ore and Commercial Samples 分光光度法测定矿石和商品样品中铀的研究

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/3873f

Yadav Dilip, Janwadkar Suhas, Rana Paritosh

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Green Synthesis of L-DOPA Coated Gold Nanoparticles from a Natural Source 天然来源的左旋多巴包覆金纳米颗粒的绿色合成

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/12139d

Ragni N. Vora, A. Joshi, N. Joshi

引用次数: 0

A Detailed Computational Investigation on the Structural and Spectroscopic Properties of Some Pyran Compounds 一些吡喃类化合物的结构和光谱性质的详细计算研究

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/12295d

K. Raja

引用次数: 0

Dynamic Aging of Dislocations in Materials with a High Crystalline Relief: Competition of Diffusion and Dragging Impurities 高缓晶材料中位错的动态时效:扩散和拖拽杂质的竞争

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/2371f

B. Petukhov

{"title":"Dynamic Aging of Dislocations in Materials with a High Crystalline Relief: Competition of Diffusion and Dragging Impurities","authors":"B. Petukhov","doi":"10.9734/bpi/cacs/v4/2371f","DOIUrl":"https://doi.org/10.9734/bpi/cacs/v4/2371f","url":null,"abstract":"A model of the dynamic interaction of dislocations with the impurity subsystem of crystals that have a high lattice potential relief (Peierls barriers) has been developed. Such materials include metals with a body-centered cubic structure, semiconductors, and many others. The constructed theory of the dynamic interaction of dislocations with the impurity subsystem of the crystal takes into account the inverse effect of impurities entrained by moving dislocations on the dynamics of the dislocations themselves. It is justified that the impurity kinetics during atmosphere formation includes two stages. The first (initial) stage is fast and substantially nonequilibrium; it is followed by the second stage, characterized by a slower approach to equilibrium. The initial stage manifests itself at a sufficiently fast dislocation motion and may lead to an anomalous increase in the driving force (or the yield strength of the material) with an increase in the temperature in some range. The consequences of the self-consistent nature of the process are the occurrence of instability of the movement of dislocations in a certain speed range and immobilization of dislocations at stresses with values below a certain threshold. Blocking of the dislocation motion by impurities may cause inverse brittle–ductile transition, which is observed in some materials with an increase (rather than the usual decrease) in temperature.","PeriodicalId":9826,"journal":{"name":"Challenges and Advances in Chemical Science Vol. 4","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78243301","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

Development and Validation of a Novel LC Method for the Simultaneous Determination of Montelukast and Doxofylline in Bulk and Pharmaceutical Dosage Forms 同时测定散装和药用剂型中孟鲁司特和多索茶碱的新型液相色谱法的建立和验证

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/2182f

Gadapa Nirupa, U. Tripathi

引用次数: 0

Determining the Effect of 1, 3, 5-trimethyl-2, 6-diphenyl Piperidin-4-one Oxime on the Electrochemical Behaviour of Mild Steel in HCl Medium 1,3,5 -三甲基- 2,6 -二苯哌啶-4-一肟对低碳钢在盐酸介质中电化学行为影响的测定

Challenges and Advances in Chemical Science Vol. 4 Pub Date : 2021-08-07 DOI: 10.9734/bpi/cacs/v4/3691f

K. Tharini

{"title":"Determining the Effect of 1, 3, 5-trimethyl-2, 6-diphenyl Piperidin-4-one Oxime on the Electrochemical Behaviour of Mild Steel in HCl Medium","authors":"K. Tharini","doi":"10.9734/bpi/cacs/v4/3691f","DOIUrl":"https://doi.org/10.9734/bpi/cacs/v4/3691f","url":null,"abstract":"Weight loss experiments, electrochemical methods, and SEM studies in 1M hydrochloric acid (HCl) medium against mild steel (MS) were used to evaluate the corrosion inhibiting ability of a synthetic heterocyclic compound, namely 1, 3, 5-trimethyl-2, 6-diphenyl piperidin-4-one oxime (TPO). The weight loss trials were carried out at three distinct temperatures: 30°C, 40°C, and 50°C for two hours at varied concentrations (0, 25, 50, 100, 200, and 300 ppm).The study discovered that increasing TPO concentration had a positive link with inhibition efficiency while raising temperature had a negative correlation.TPO physically adsorbs on mild steel surfaces, following Temkin’s isotherm. Tafel plot was used to determine electrochemical parameters such as corrosion potential (Ecorr), corrosion current (icorr), and Tafel slopes (ba & bc). TPO significantly reduces corrosion current and acts as a mixed mode inhibitor, according to the findings. The charge transfer resistance (Rct) and double layer capacitance (Cdl) were calculated using the AC impedance measurement determined by the Nyquist plot, whose results complimented each other. TPO's ability to form films in HCl medium was revealed by SEM studies. The values of Rct increase with increase of TPO concentration showed TPO as good inhibitor.","PeriodicalId":9826,"journal":{"name":"Challenges and Advances in Chemical Science Vol. 4","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83013867","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