摘要
通过合理选择工作标准溶液绘制校准曲线,优化了直接吸入原子吸收分光光度法测定清洁地表水中铜、铅、镉的方法.铜、铅、镉的检出限分别为 0.002 5、0.013 1、0.001 2 mg/L,相对标准偏差RSD均小于 5%;测试低浓度溶液,相对偏差RD均小于20%.该方法操作简便快捷,精密度和准确度高,可满足地表水铜Ⅰ类、铅Ⅲ类、镉Ⅱ类标准限值及以下的定量测定要求.
Abstract
In this paper,a method for determining copper,lead,and cadmium in clean surface water by direct inhalation atomic absorption spectrophotometry was optimized by selecting appropriate working standard solutions to construct a calibration curve.The detection limits for copper,lead,and cadmium were 0.002 5,0.013 1,and 0.001 2 mg/L,respectively,with relative standard deviations(RSD)all less than 5％.For testing low-concentration solutions,the relative deviations(RD)were all less than 20％.This method is simple,fast,and has high precision and accuracy,meeting the quantitative determination requirements for copper(Class Ⅰ),lead(Class Ⅲ),and cadmium(Class Ⅱ)standard limits and below in surface water.
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