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本文建立微量Sb~(3+)、Pb~(2+)、Cu~(2+)、Bi~(3+),Fe~(3+)的分光光度联合测定法,系在6M盐酸中,分别在2550、2700、2850、3270、3600(?)测量混合溶液的吸光度,然后用计算式,计算各离子的含量。单组分在下列范围内遵从比耳定律:Sb~(3+)、Pb~(2+)、Bi~(3+)离子浓度各为1～35ppm;Cu~(2+)、Fe~(3+)离子浓度各为1～40ppm。此法精密度良好,受放置时间、温度等影响小。由一些混合物的分析结果表明:各组分含量在5～20 ppm范围内,其误差不超过±10％。Ca~(2+)、Mg~(2+)、Zn~(2+)、Cd~(2+)、Mn~(2+)、Ni~(2+)、Al~(3+)、OAc~-、PO_4~(3-)、SO_4~(2-)等单个离子的浓度在10克·升~(-1)以下时不干扰此法。MoO_4~(2-)及VO_3~-离子干扰此法,但用N-苯甲酰N-苯羟胺(BPHA)-氯仿从6MHCl溶液萃取分离后,便可消除干扰。
In this paper, the determination of trace Sb ~ (3 +), Pb ~ (2 +), Cu ~ (2 +), Bi ~ (3 +) and Fe ~ (3+) Respectively at 2550,2700,2850,3270,3600 (?) Measurement of the absorbance of the mixed solution, and then use the formula to calculate the content of each ion. Beer’s law is obeyed for the single component in the following ranges: Sb ~ (3 +), Pb ~ (2 +) and Bi ~ (3 +) ions concentration of 1 ~ 35ppm each; Cu ~ (2 +), Fe ~ 3+) ion concentration of 1 ~ 40ppm each. This method is good precision, by placing time, temperature and other small impact. The analysis results of some mixtures showed that the content of each component was in the range of 5-20 ppm with an error of not more than ± 10%. Ca2 +, Mg2 +, Zn2 +, Cd2 +, Mn2 +, Ni2 +, Al3 +, OAc ~ ~, PO_4 ~ (3 -), SO_4 ~ (2-) and other single ion concentrations below 10 g · L -1 do not interfere with this method. MoO_4 ~ (2-) and VO_3 ~ - ions interfere with this method, but with N-benzoyl N-benzene hydroxylamine (BPHA) - chloroform extraction from the 6MHCl solution, you can eliminate interference.