石墨炉原子吸收法测定土壤中的镉  

Determination of Trace Cadmium in Soil Samples by GFAAS

作　　者：李雪晴[1] 李洪刚 

机构地区：[1]东北农业大学食品学院,哈尔滨150030 [2]黑龙江省地质调查研究总院齐齐哈尔分院,齐齐哈尔161005

出　　处：《现代科学仪器》2016年第5期115-117,共3页Modern Scientific Instruments

摘　　要：基体改进剂，进行了研究，快速、准确，在高温炉中灼烧去除试样中的有机成分，样品经氢氟酸-盐酸-硝酸-高氯酸混合酸一次加入溶解，不添加用石墨炉原子吸收光谱法直接测定土壤样品中的痕量镉。对样品的预处理方法、加酸方法、灰化、原子化温度优化了仪器工作条件。方法检出限为0．006mg kg-1，测定值的相对标准偏差（RSD，n=5）低于7％。方法简单、适用于大批量土壤样品中痕量镉的分析。The organic compounds in the soil samples were removed by heating in the high temperature furnaces. Samples were dissolved with mixed acids of HF-HCl-HNO3-HClO4, and trace cadmium was directly determined by GFAAS without any matrix modifier. The instrumental parameters were optimized and some influencing factors such as sample pretreatment, adding acid method, temperature of ashing and atomization in GFAAS determination were studied. The detection limit of the method for cadmium is 0.006mg kg-1 with precision of less than 7.0% RSD （n=5） . The method provides the advantages of simple operation, high efficiency, accuracy, and suitable for the determination of trace cadmium in soil samples.

关 键 词：石墨炉原子吸收光谱法 镉 土壤 氖灯扣背景 

分 类 号：O657.31[理学—分析化学]