催化极谱法测定水中铅

Determination of Pb in Water by Catalytic Polarography

对铅的碘化物在弱酸性底液中的极谱行为进行了初步的试验,通过加钒(Ⅳ)作为氧化剂产生催化波,找到了一种灵敏度较高,选择性、稳定性较好的底液。经过十余种元素的试验表明,该底液在一定范围内均不干扰铅的测定。极谱峰电位为-4V(VS.SCE),铅浓度在0.002～1.2mg/L范围内与峰电流有良好的线性关系,检测下限为0.010mg/L,铅的波形清晰,重现性好。加标回收回收率为99%～102%,相对误差<4.3%,方法准确、简便、快速,应用于水样中铅的测定,得到满意结果。

Have carried on the preliminary test to the lead＇s polarography behavior in a weak acid supporting electrolyte of iodide, through adding vanadium （ Ⅳ ） as oxidant to produce catalysis wave , find a relatively high sensitivity, better selecivity and stability supporting eletrolyte. After test for more than ten kinds of elements, the results indicate that they do not interfere lead＇s determination within the specific limits. The peak potential of about -4V （VS. SCE）. The peak height is in good linear relationship with the concentration of Pb in the range of 0.002～1.2mg/L. The detection limit is 0.010 mg/L. The adsorptive waves are well-defined and good in reproducibility. The recoveries are 99% ～102% for Pb. The relative errors are less than 4.3%. The determination results indicate that the analysis of Pb in water by catalytic oscillopolarography is a simple, accurate and time-saving method. It can be applied to the determination of trace Pb in water with satisfactory results.