流动注射光散射法测定水样中微量Pb(Ⅱ)

Flow injection and light scattering method determination of trace Pb(Ⅱ) in water sample

利用自制的流通池,提出了流动注射分析与光散射光谱法联用的技术;研究Pb^2＋与S^2-反应体系在470nm处散射光强度与溶液中Pb^2＋的浓度成线性关系,据此建立一种检测微量Pb（Ⅱ）的新方法;方法的线性范围为0-120μg/ml,相关系数r=0.9980,检出限为1.9989μg/ml,RSD=3.53%,测定频率为48次/h;测定结果表明本文所建立的方法简单快速,灵敏度高,化学试剂少。方法适用于测定水样中的微量铅,结果令人满意。

Using the self- made circulation pond, proposed the combination technique of flow injection analysis and light - scattering method; studied the reaction system of Pb^2＋ and S^2- , and there was a linear relationship between scattering intensily and concentration of Pb^2＋ in solution at the 470 nm wave length, based on this, a new method for determination Of trace Pb（ Ⅱ ） was presented; the linear range of this method was 0 - 120μg/ml, the ceeffocient of correlation r = 0.9980, the detection limit was 1. 9989μg/ml, RSD = 3.53%, the determination frequency was 48 times/h; the determination result showed that the method established in this paper was simple and quick, highly sensitive,less chemical reagents. This method can be applied to determine trace lead in water sample, the results were satisfactory.