ICP-AES测定饮用水中5种重金属元素

Determination of Five Heavy Metal Elements in Drinking Water by ICP-AES

应用电感耦合等离子体-原子发射光谱法(ICP-AES)直接测定饮用水中砷、镉、铬、汞和铅5种痕量重金属元素。为了降低光谱分析检出限,在水样品中加入一定体积的有机添加剂,以提高光谱的信背比。实验结果发现,当加入6%的正丙醇以后,光谱信背比增加幅度是最大的,元素砷、镉、铬、汞和铅的光谱信背比比无添加剂时分别提高了177.4%、45.2%、38.9%、354.7%和83.8%。定量分析结果表明,各元素的相对标准偏差(RSD)在4.5%—8.0%之间,回收率为96.7%—107.1%。

Arsenic,cadmium,chromium,mercury and lead in drinking water were determined directly by inductively coupled plasma-atomic emission spectrometry.In order to decrease detection limit of spectral analysis,different volume of organic additives were added in drinking water sample to improve signal-to-background ratios of spectrum.Signal-to-background ratios of arsenic,cadmium,chromium,mercury and lead were increased 177.4%,45.2%,38.9%,354.7%,and 83.8% after adding 6% n-propanol,respectively.The quantitative analysis results showed that the relative standard deviations （RSD） are 4.5%—8.0%,and recovery rates are 96.7%—107.1%.