The Experts below are selected from a list of 783 Experts worldwide ranked by ideXlab platform
Kuifu Zhao - One of the best experts on this subject based on the ideXlab platform.
-
simultaneous determination of nickel cobalt and mercury ions in water samples by solid phase extraction using multiwalled carbon nanotubes as adsorbent after chelating with Sodium Diethyldithiocarbamate prior to high performance liquid chromatography
Journal of Chromatography A, 2014Co-Authors: Qingxiang Zhou, An Xing, Kuifu ZhaoAbstract:Abstract Multiwalled carbon nanotubes (MWNTs) have been widely used for the enrichment of trace important pollutants in environment because of its large specific surface area, high extraction efficiency, and easy operation. In this study, a solid phase extraction method was established to determine nickel (Ni 2+ ), cobalt (Co 2+ ) and mercury (Hg 2+ ) ions using MWNTs as the adsorbent and Sodium Diethyldithiocarbamate (DDTC) as the chelating agent. The final analysis was performed on a high performance liquid chromatography (HPLC). The factors that may influence the extraction efficiency were optimized in detail including the type and volume of elution solvent, sample pH, volume of chelating agent solution, and volume of sample solution, etc. The experimental results indicated that good linear relationship between peak area and the concentration of the ions was achieved in the range of 0.1–100 μg L −1 , 0.1–50 μg L −1 , and 2.7–300 μg L −1 for Ni 2+ , Co 2+ , and Hg 2+ , respectively. The precision was determined by calculating the relative standard deviation (R.S.D.) values that were in the range of 6.2–11.7% under the optimal conditions. The detection limits of Ni 2+ , Co 2+ , and Hg 2+ were in the range of 0.04-0.9 μg L −1 (S/N = 3). The presented method was applied for the determination of the metal ions mentioned above in real water samples, and satisfied results were achieved. All these indicated that proposed method will be a good alternative tool for monitoring the target ions in environmental samples in the future.
Rusong Zhao - One of the best experts on this subject based on the ideXlab platform.
-
simultaneous determination of copper cobalt and mercury ions in water samples by solid phase extraction using carbon nanotube sponges as adsorbent after chelating with Sodium Diethyldithiocarbamate prior to high performance liquid chromatography
Analytical and Bioanalytical Chemistry, 2016Co-Authors: Lei Wang, Jiabin Zhou, Xia Wang, Zhenhua Wang, Rusong ZhaoAbstract:Recently, a sponge-like material called carbon nanotube sponges (CNT sponges) has drawn considerable attention because it can remove large-area oil, nanoparticles, and organic dyes from water. In this paper, the feasibility of CNT sponges as a novel solid-phase extraction (SPE) adsorbent for the enrichment and determination of heavy metal ions (Co(2+), Cu(2+), and Hg(2+)) was investigated for the first time. Sodium Diethyldithiocarbamate (DDTC) was used as the chelating agent and high performance liquid chromatography (HPLC) for the final analysis. Important factors which may influence extraction efficiency of SPE were optimized, such as the kind and volume of eluent, volume of DDTC, sample pH, flow rate, etc. Under the optimized conditions, wide range of linearity (0.5-400 μg L(-1)), low limits of detection (0.089~0.690 μg L(-1); 0.018~0.138 μg), and good repeatability (1.27~3.60 %, n = 5) were obtained. The developed method was applied for the analysis of the three metal ions in real water samples, and satisfactory results were achieved. All of these findings demonstrated that CNT sponges will be a good choice for the enrichment and determination of target ions at trace levels in the future.
M Chikhi - One of the best experts on this subject based on the ideXlab platform.
-
elimination of cu ii from aqueous solutions by liquid liquid extraction test of Sodium Diethyldithiocarbamate sddt as an extracting agent
Energy Procedia, 2012Co-Authors: S Meterfi, A H Meniai, M ChikhiAbstract:Abstract The presence of heavy metals in industrial wastewaters, can be an important source of pollution, and may be a severe health hazard, due to their toxicity and to the fact that they are not amenable to biological degradation. Copper is a typical environmental heavy metal pollutant. It is considered in the present study since at high concentration exceeding certain limits, it may cause severe mucosal and a central nervous irritations, necrotic changes in the liver and kidney, etc. So it is necessary to treat wastewaters containing this heavy metal to reduce its concentration before discharge. Different and traditional methods for the removal and recovery of copper from industrial waste streams do exist each having its lacks and shortcomings. One can cite precipitation, ion exchange, electrolysis, adsorption on activated carbon and liquid-liquid extraction which is used in the present work. The main objective of the present experimental work is the determination of the best conditions for the extraction of Cu(II) ions from aqueous solutions, using Sodium Diethyldithiocarbamate (SDDT) as the extracting agent and different organic solvents, such as chloroform and dichloromethane, as diluents. The analysis of the aqueous phase after separation was performed by means of an atomic absorption spectrophotometer. The obtained experimental results showed that high copper extraction yields are achieved for an added extracting agent mass greater than 7.5 mg, fixing the aqueous phase pH at 9. The results showed that the extraction process was more efficient when using dichloromethane rather than chloroform, although this latter is more used in practice.
Saleh Alwasel - One of the best experts on this subject based on the ideXlab platform.
-
novel functionally substituted esters based on Sodium Diethyldithiocarbamate derivatives synthesis characterization biological activity and molecular docking studies
Bioorganic Chemistry, 2020Co-Authors: Alverdi Karimov, And A. Orujova, And V. Sujayev, Parham Taslimi, Nastaran Sadeghian, Bahtiyar Mammadov, Halide Sedef Karaman, Vagif Farzaliyev, Recep Tas, Saleh AlwaselAbstract:Abstract Alkylation of Sodium Diethyldithiocarbamate with allyl-2-chloroacetate, allyl-3-chloropropionate, chloromethyl-2-(tetrahydrofuran-2-yl)acetate, and 4-(chloromethyl)-1,3-dioxolane in the aqueous medium synthesized functionally substituted esters of N, N-dietyleditiocarbamic acid (M1-M4). Most active compounds were docked into the catalytic active site of the enzyme. We identified that acetate moiety for inhibition of hCA I, hCA II, and α-glycosidase and dioxolane and thiocarbamic acid moieties for inhibition of AChE and BChE enzymes are very important. The hCA I isoform was inhibited by these novel functionally substituted esters based on Sodium Diethyldithiocarbamate derivatives (M1-M4) in low micromolar levels, the Ki of which differed between 48.03 ± 9.77 and 188.42 ± 46.08 µM. Against the physiologically dominant isoform hCA II, the novel compounds demonstrated Kis varying from 57.33 ± 6.21 to 174.34 ± 40.72 µM. Also, these novel derivatives (M1-M4) effectively inhibited AChE, with Ki values in the range of 115.42 ± 12.44 to 243.22 ± 43.65 µM. For BChE Ki values were found in the range of 94.33 ± 9.14 to 189.45 ± 35.88 µM. For α-glycosidase the most effective Ki values of M4 and M3 were with Ki values of 32.86 ± 7.88 and 37.63 ± 4.08 µM, respectively.
Qingxiang Zhou - One of the best experts on this subject based on the ideXlab platform.
-
simultaneous determination of nickel cobalt and mercury ions in water samples by solid phase extraction using multiwalled carbon nanotubes as adsorbent after chelating with Sodium Diethyldithiocarbamate prior to high performance liquid chromatography
Journal of Chromatography A, 2014Co-Authors: Qingxiang Zhou, An Xing, Kuifu ZhaoAbstract:Abstract Multiwalled carbon nanotubes (MWNTs) have been widely used for the enrichment of trace important pollutants in environment because of its large specific surface area, high extraction efficiency, and easy operation. In this study, a solid phase extraction method was established to determine nickel (Ni 2+ ), cobalt (Co 2+ ) and mercury (Hg 2+ ) ions using MWNTs as the adsorbent and Sodium Diethyldithiocarbamate (DDTC) as the chelating agent. The final analysis was performed on a high performance liquid chromatography (HPLC). The factors that may influence the extraction efficiency were optimized in detail including the type and volume of elution solvent, sample pH, volume of chelating agent solution, and volume of sample solution, etc. The experimental results indicated that good linear relationship between peak area and the concentration of the ions was achieved in the range of 0.1–100 μg L −1 , 0.1–50 μg L −1 , and 2.7–300 μg L −1 for Ni 2+ , Co 2+ , and Hg 2+ , respectively. The precision was determined by calculating the relative standard deviation (R.S.D.) values that were in the range of 6.2–11.7% under the optimal conditions. The detection limits of Ni 2+ , Co 2+ , and Hg 2+ were in the range of 0.04-0.9 μg L −1 (S/N = 3). The presented method was applied for the determination of the metal ions mentioned above in real water samples, and satisfied results were achieved. All these indicated that proposed method will be a good alternative tool for monitoring the target ions in environmental samples in the future.