平台石墨炉原子吸收光谱法测定水中的重金属

Direct Determination of the Heavy Metal in Waterwith Platform Furnace Graphite by AAS

利用STPF技术,直接测定水样中10种重金属元素。通过对灰化温度、背景扣除、基体改进剂等三方面的研究,得出了各被测重金属元素的最佳灰化温度,确定了测定海水或其它水样中重金属元素的方法,即用硝酸调节水样的pH值为1,在最佳灰化温度下,用D2扣除背景,用氩气作保护气进行测定。该方法测定各重金属的加标回收率为91.3—108.4%,相对标准偏差为3.49—9.12%,具有准确度和精确度高等优点。

This paper studied three respects:matrix modifier, background absorption and ashing temperature,and determinates ten heavy metal in sea-water directly by using nitric acid as matrix modifier, correcting background with deuterium lamp and using argon gas as sheath gas. All percent recoveries of the ten heavy metal are about 91.3-108.4%, and the relative standard deviations are 3.49-9.12%.