测定煤矿区土壤中元素含量的火焰原子吸收法

Flame atomic absorption spectrometry study of determining element contents in soil in coal mining area

摘要: 火焰原子吸收法虽已应用于各个行业领域,但该法存在样品称样量大、加酸后消解时间长、实验干扰较多等问题,其实际应用受到局限。针对这一情况,考虑到煤矿区土壤样品的特点,经过反复摸索,建立了用火焰原子吸收分光光度计测定硝酸-高氯酸消解后的土壤样品中Zn、Cu、Fe、Mg、Ca、K和Na 7种元素含量的新方法。该方法简单、快速,灵敏度和准确度较高,相对标准偏差在2.9%以下,加标回收率在97.3%~112.5%,并应用于淮南煤矿区土壤样品,取得了令人满意的效果。

Abstract: FAAS(Flame Atomic Absorption Spectrometry) has already been widely used to many fields.However,due to several problems such as too many samples required,too long digested time and more interferers during the FAAS experiment,its use in practice is limited.In order to solve these problems,a new method using the FAAS to determine Zn、Cu、Fe、Mg、Ca、K and Na,seven element contents of soil samples in coal mining area after digested by HNO₃-HClO₄ is established in this paper after doing trial and error,combining with the characters of these samples.The method is easy and rapid with satisfied results.The relative standard deviations of these soil samples from Huainan coal mining area are less than 2.9%,while the recoveries of the additional standard are in the range of 97.3%~112.5%.