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关于微量铅的测定,常见的有原子吸收法、分光光度法、阳极溶出伏安法等.关于络合物极话吸附法测定微量铅也有报道,但铅(Ⅱ)一向红菲步啉体系的极谱行为研究尚未见报道.该法灵敏度高,选择性较好,简单、快速.其线性范围为1.0×10~(-7)~4.0×10~(-6)mom/L,用于化妆品及牙膏中微量铅的测定,结果满意.2 实验部分2.1 试剂与仪器 1.00×10~(-2)mol/L 铅标准溶液:按常规方法配制(介质为0.2 mol/L HAc溶液);1.00×10~(-2)mol/L向红菲啰啉(BPT)溶液;l mol/LHAc溶液;l mol/L NaAc溶液.JP-3 型示波极谱仪,参比电极为饱和甘汞电极.
About the determination of trace lead, there are common atomic absorption spectrophotometry, anodic stripping voltammetry, etc. About the determination of trace lead by complex polar absorption method has also been reported, but the lead (Ⅱ) The study of polarographic behavior has not been reported yet.The method has the advantages of high sensitivity, good selectivity, simplicity and rapidity.The linear range is 1.0 × 10 -7 -4 4.0 × 10 -6 mom / L, And toothpaste trace lead determination with satisfactory results.2 Experimental 2.1 Reagents and equipment 1.00 × 10 -2 mol / L lead standard solution: prepared by conventional methods (medium is 0.2 mol / L HAc solution); 1.00 × 10 ~ (-2) mol / L BPP solution; l mol / LHAc solution; l mol / L NaAc solution.JP-3 oscillopolarography, the reference electrode for the saturated calomel electrode .