流动注射分光光度法测定海水中痕量重金属

Determination of Trace Soluble Heavy Metals in Seawater Based on Flow Injection Analysis and Spectrophotometry

针对水体中污染较重且含量较高的可溶态痕量重金属镉(Cd2+)、铜(Cu2+)、锌(Zn2+)、镍(Ni2+),提出采用流动注射分光光度法测定海水中痕量可溶性重金属。首先分析了四种重金属离子Cd2+、Cu2+、Zn2+、Ni2+在不同波长下的吸光光谱,然后建立了4水平4因素的正交校正集作为多元线性回归数据分析模型,最后搭建了重金属离子浓度测量装置,检测了海水中的可溶性Cd2+、Cu2+、Zn2+、Ni2+浓度,检测下限可达10-9(ppb)。

For the heavy pollution and high content of trace soluble heavy metals Cd^2＋、Cu^2＋、Zn^2＋、Ni^2＋ in waters, a determination method of trace soluble heavy metals in seawater is proposed based on flow injection analysis and spectrophotometry. Firstly, the absorption spectrums of four heavy metal ions are analyzed at different wavelengths. Then, an orthogonal correction set with 4 levels and 4 factors is established as the multiple linear regression analysis model. Finally, the measuring equipment of four heavy metal ions is set up, the concentration of soluble metals Cd^2＋、Cu^2＋、Zn^2＋、Ni^2＋ in waters is measured, and the detection limit at 10^-9（ppb） can be achieved.