固体直接进样-石墨炉原子吸收法测定环境土壤中的铅和镉  

Determination of Lead and Cadmium in Environmental Soil by Solid Direct Injection Graphite Furnace Atomic Absorption Method

作　　者：赵丽娜 Zhao Lina(Luoyang Xinjiu Environmental Protection Technology Co.,Ltd.,Luoyang 470003,China)

机构地区：[1]洛阳市欣久环保科技有限公司,河南洛阳470003

出　　处：《山东化工》2024年第16期271-274,共4页Shandong Chemical Industry

摘　　要：为了更加高效、精准地对环境土壤中的铅和镉含量进行定量分析,研究了固体直接进样-石墨炉原子吸收法在测定环境土壤中铅和镉含量方面的应用。通过将德国耶拿公司的SSA600型全自动固体进样装置与ZEEnit700P型原子吸收光谱仪进行联用,实现了土壤样品的直接进样测定。通过控制变量方法对实验的灰化温度、原子化温度和取样量进行了优化,在最佳条件下,Pb和Cd的检出限分别为0.15μg/g和0.01μg/g,显示出该方法的高灵敏度。通过对GSS-29~35农业土壤成分分析样品国家标准物质的测定,验证了方法的准确度,相对误差在±10%以内。精密度实验表明,该方法具有良好的一致性。与传统电热板酸溶-石墨炉原子吸收法的比对分析显示,两种方法测定结果具有显著的线性相关性(Pb的R^(2)为0.941,Cd的R^(2)为0.84),证实了新方法的可靠性。In order to quantitatively analyze the content of lead and cadmium in environmental soil more efficiently and accurately,the application of solid direct injection graphite furnace atomic absorption method in determining the content of lead and cadmium in environmental soil was studied.The direct injection determination of soil samples was achieved by combining the SSA600 fully automatic solid sampling device from Jena,Germany with the ZEEt700P atomic absorption spectrometer.The ashing temperature,atomization temperature,and sampling amount of the experiment were optimized by controlling the variables.Under the optimal conditions,the detection limits for Pb and Cd were 0.15μg/g and 0.01μg/g,respectively,demonstrating the high sensitivity of this method.The accuracy of the method was verified by measuring the national standard substances of GSS-29-35 agricultural soil composition analysis samples,with a relative error within±10%.The precision experiment shows that this method has good consistency.The comparative analysis with the traditional electric heating plate acid dissolution graphite furnace atomic absorption method shows a significant linear correlation between the two methods R^(2)0.941,R^(2)of Cd 0.84 confirms the reliability of the new method.

关 键 词：固体直接进样 石墨炉原子吸收 环境土壤 铅 镉 

分 类 号：O657.3[理学—分析化学] X833[理学—化学]