【摘要】 本文系统研究了海水、土壤、沉积物和生物中Cd、Pb和Zn用火焰原子吸收直接法测定时的干扰与背景校正。由于这些物质基体中含有大量Al、Na、K、Ca、Mg、Fe等元素 ,在火焰中形成MX、MO和MOH分子光谱与分析元素线重叠 ,经背景校正后可获得更准确的结果和更好的回收率 ,对检出限和精密度均有改善更多还原

【Abstract】 This paper describes interference and background correction problem of direct determination of Pb,Zn and Cd in soil,sediment,plants,halobios and sea water by FAAS.With the improvement of limit of detection(L.O.D) of instrument,Pb,Zn and Cd in same environmental and biological samples can be analyzed directly by FAAS,but it is worth taking attention that there are quantities of elements which lead to background interference in air-ethyne flame,such as Al,Na,K Ca,Mg and Fe.Compare with no background correction,limit of detection using D 2 lamp background correction is improved by 105—45 times,the recoveries and the relative standard deviation(R.S.D) are better,standard samples were also analyzed with satisfactory results.更多还原