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在含有高氯酸、磷酸、溴化钠、草酸的底液中,Pb~(2+)与Br~-的络合物能在滴汞电极上产生极灵敏的吸附催化波,体系抗干扰能力强。能有效地消除大量锡、砷、锑、锰的影响。另外,还对Al~(3+),Fe~(3+),Ca~(2+),Zn~(2+),F~-,Si(Ⅳ),Cl~-,Cr~(3+),WO_4~(2-),Hg~(2+),Cu~(2+),V~(5+),Bi~(3+),Ti~(4+),MoO_4~(2-),Co~(2+),Ag~+,Au~(3+),Cd~(2+),Zr~(4+),La~(3+),Nb~(5+),Ta~(5+),Ga~(3+),Ge~(4+),In~(3+),Tl~(3+),Te~(6+),pt~(2+),Pd~(2+)等30多种离子的影响作了试验,发现这些元素的离子均不影响铅的测定。本法灵敏度高,检测限达0.01微克铅/毫升。在0—300微克/50毫升铅,其浓度与催化波的峰电流成正比。分析操作简便、快速,适用于大批量试样中铅的测定。特别是化探试样中微量铅的测定。
In the bottom solution containing perchloric acid, phosphoric acid, sodium bromide and oxalic acid, the complex of Pb 2+ and Br ~ - can produce extremely sensitive adsorption catalytic wave on the droplet mercury electrode. The anti-interference ability of the system Strong. Can effectively eliminate a large number of tin, arsenic, antimony, manganese impact. In addition, the effects of Al 3+, Fe 3+, Ca 2+, Zn 2+, F ~ -, Si (Ⅳ), Cl ~ -, Cr ~ (3+ (2 +), Cu 2+, V 5+, Bi 3+, Ti 4+, MoO 4 2-, , Co ~ (2 +), Ag ~ +, Au ~ (3 +), Cd 2+, Zr 4+, La 3+, Nb 5+, Ta ~ (4 +), In ~ (3 +), Tl ~ (3 +), Te ~ (6 +), pt ~ (2 +), Pd ~ (2 +), Ga ~ +) And other more than 30 kinds of ions were tested and found that the ions of these elements do not affect the determination of lead. The law of high sensitivity, detection limit of 0.01 ug lead / ml. At 0-300 μg / 50 ml of lead, its concentration is proportional to the peak current of the catalytic wave. Analysis is simple, fast, suitable for the determination of lead in large quantities of samples. Especially the determination of trace lead in geochemical exploration samples.