Zhang G, Li J, Fu D, Hao D, Xiang P
Dept. of Chem., Henan Normal University, Xin Yiang, Henan, 453002, P.R. China.
Talanta. 1993 Mar;40(3):409-13. doi: 10.1016/0039-9140(93)80253-n.
A three-coil tungsten wire is used as electrode for the preconcentration of cadmium, which is then placed in a graphite tube for atomization and atomic absorption measurement. The heating parameters of the graphite furnace are optimized using the Modified and Weighted Centroid Simplex Method (MWCS), and computer program for automatic calculation. Sulphuric acid is selected as the supporting electrolyte for electrodeposition. The linear range of the calibration graph is 0.00-0.55 ng/ml. The detection limit is 0.01 ng/ml. For 0.1 ng/ml cadmium the coefficient of variation is 3.35% for ten parallel determinations. No interference occurs in the presence of more than 20 coexisting ions. Traces of cadmium in urine of normal people and in river water and the recoveries for cadmium are determined. The results are satisfactory.
采用三线圈钨丝作为电极对镉进行预富集，然后将其置于石墨管中进行原子化和原子吸收测量。使用改进加权质心单纯形法（MWCS）和自动计算的计算机程序对石墨炉的加热参数进行优化。选择硫酸作为电沉积的支持电解质。校准曲线的线性范围为0.00 - 0.55 ng/ml。检测限为0.01 ng/ml。对于0.1 ng/ml的镉，十次平行测定的变异系数为3.35%。在存在20多种共存离子的情况下无干扰。测定了正常人尿液、河水中的痕量镉以及镉的回收率。结果令人满意。
