A new method of simultaneous determining Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Mn(Ⅱ), Co(Ⅱ)and Ni(Ⅱ) with a single sweep polarography was developed. The experiment condition was studied and the results shou that the optimum base...A new method of simultaneous determining Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Mn(Ⅱ), Co(Ⅱ)and Ni(Ⅱ) with a single sweep polarography was developed. The experiment condition was studied and the results shou that the optimum base solution is that the residue got from evaporating 25 mL mixed solution, 2.5 mL 1.0 mol/L ethylenediamine, 3.0 mL 1 .0 mol/L ammonia-ammonium chloride,5.0mL, 10 % sodium sulfite and 0.5 mL 0.5 % gelatin were mixed and diluted to 25 mL, with water.Under the condition of this base solution, the polarography wave shapes of the six cations are ideal and without overlap of the peaks. In this base solution, Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Mn(Ⅱ). Co(Ⅱ) and Ni(Ⅱ)in synthetic samples were determined with relative errors 0.4-9.4 % and relative standard deviations 0.8%- 12.2%. Under this experiment condition, one fold of Pb(Ⅱ), Cr(Ⅵ) and Mo(Ⅵ ) do not interere with the determination for Cu(Ⅱ). This method has been used to the simultaneous determination of the amount of the six cations in the samples of soil and Beiqi Tea. The relative standard deviations were 0.1%-2.1 % and recoveries were 93.5%-99.0 %.展开更多
A spectrophotometric method for the determination of cysteine was developed basing on the reaction of cysteine with cobalt (Ⅱ) in NH 4Cl NH 4OH. The molar absorptivity is 7.98×10 3 L·mol -1 ·cm...A spectrophotometric method for the determination of cysteine was developed basing on the reaction of cysteine with cobalt (Ⅱ) in NH 4Cl NH 4OH. The molar absorptivity is 7.98×10 3 L·mol -1 ·cm -1 at 284 nm. Beer′s law is obeyed for cysteine in the range of 0～2.0×10 -4 mol·L -1 . The method was applied to the assay of cysteine in urine.展开更多
N, N, N′,N′-ethylenediaminetetrakis(methylenephosphonic acid), EDTPO, was synthesized and char-acterized by element analysis. The reaction of EDTPO with Cu(Ⅱ) formes a stable blue complex with a molarabsorptivity o...N, N, N′,N′-ethylenediaminetetrakis(methylenephosphonic acid), EDTPO, was synthesized and char-acterized by element analysis. The reaction of EDTPO with Cu(Ⅱ) formes a stable blue complex with a molarabsorptivity of 2. 88 × 10￣3 L· mol￣(-1)· cm￣(-1) at 285. 1nm. The composition of the complex is determined tobe 1: 1 . The concentration of Cu (Ⅱ)obeys the Beer′s law from 12. 7μg/ml to 50. 8 μg/ml .Co(Ⅱ), Mn(Ⅱ), Pb(Ⅱ), Cd(Ⅱ), Ca(Ⅱ), Mg (Ⅱ), Cr (Ⅱ) cause a negligible interference except forFe(Ⅱ), Zn(Ⅱ) in the determination of Cu (Ⅱ) with EDTPO. The spectrophotometric determinationof Cu(Ⅱ) is developed. This method is successfully used in determination of Cu(Ⅱ)in anolyte of electrolyticnickel.展开更多
文摘A new method of simultaneous determining Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Mn(Ⅱ), Co(Ⅱ)and Ni(Ⅱ) with a single sweep polarography was developed. The experiment condition was studied and the results shou that the optimum base solution is that the residue got from evaporating 25 mL mixed solution, 2.5 mL 1.0 mol/L ethylenediamine, 3.0 mL 1 .0 mol/L ammonia-ammonium chloride,5.0mL, 10 % sodium sulfite and 0.5 mL 0.5 % gelatin were mixed and diluted to 25 mL, with water.Under the condition of this base solution, the polarography wave shapes of the six cations are ideal and without overlap of the peaks. In this base solution, Cu(Ⅱ), Zn(Ⅱ), Fe(Ⅱ), Mn(Ⅱ). Co(Ⅱ) and Ni(Ⅱ)in synthetic samples were determined with relative errors 0.4-9.4 % and relative standard deviations 0.8%- 12.2%. Under this experiment condition, one fold of Pb(Ⅱ), Cr(Ⅵ) and Mo(Ⅵ ) do not interere with the determination for Cu(Ⅱ). This method has been used to the simultaneous determination of the amount of the six cations in the samples of soil and Beiqi Tea. The relative standard deviations were 0.1%-2.1 % and recoveries were 93.5%-99.0 %.
文摘A spectrophotometric method for the determination of cysteine was developed basing on the reaction of cysteine with cobalt (Ⅱ) in NH 4Cl NH 4OH. The molar absorptivity is 7.98×10 3 L·mol -1 ·cm -1 at 284 nm. Beer′s law is obeyed for cysteine in the range of 0～2.0×10 -4 mol·L -1 . The method was applied to the assay of cysteine in urine.
文摘N, N, N′,N′-ethylenediaminetetrakis(methylenephosphonic acid), EDTPO, was synthesized and char-acterized by element analysis. The reaction of EDTPO with Cu(Ⅱ) formes a stable blue complex with a molarabsorptivity of 2. 88 × 10￣3 L· mol￣(-1)· cm￣(-1) at 285. 1nm. The composition of the complex is determined tobe 1: 1 . The concentration of Cu (Ⅱ)obeys the Beer′s law from 12. 7μg/ml to 50. 8 μg/ml .Co(Ⅱ), Mn(Ⅱ), Pb(Ⅱ), Cd(Ⅱ), Ca(Ⅱ), Mg (Ⅱ), Cr (Ⅱ) cause a negligible interference except forFe(Ⅱ), Zn(Ⅱ) in the determination of Cu (Ⅱ) with EDTPO. The spectrophotometric determinationof Cu(Ⅱ) is developed. This method is successfully used in determination of Cu(Ⅱ)in anolyte of electrolyticnickel.
