超声辅助—碱溶液提取火焰原子吸收分光光度法测定土壤和沉积物中的六价铬  

Ultrasound-assisted/Alkali Solution-Determination of Hexavalent Chromium in Soil and Sediment by Flame Atomic Absorption Spectrometry

作　　者：刘帅涛 尹学旺 韩婷婷 井小静 岳海丽 李明阳 Liu Shuaitao;Yin Xuewang;Han Tingting;Jing Xiaojing;Yue Haili;Li Mingyang(Henan Geological Bureau of CCGMB,Zhengzhou,Henan,410000,China)

机构地区：[1]中化地质矿山总局河南地质局,河南郑州450000

出　　处：《化工矿产地质》2024年第1期76-81,共6页Geology of Chemical Minerals

摘　　要：本文建立了超声辅助-碱溶液提取火焰原子吸收分光光度法测定土壤和沉积物中六价铬的方法,与国标HJ 1082-2019方法相比,采用pH=11的NH_(4)OH-NH4Cl溶液作为提取剂,98±2℃热水中超声辅助提取60min,离心机分离,再加入无水硫酸钠作为信号增强剂进行测定,避免了HJ1082-2019提取步骤繁琐、生成大量沉淀、分离效率低的缺点。该方法的检出限为0.49mg/kg,测定下限为1.96mg/kg,相对标准偏差(RSD,n=6)为2.9%~3.4%,加标回收率为94.2%~100.8%,具有操作简单、准确度高、批量处理样品效率高等优点。A method for the determination of hexavalent chromium in soil and sediment by ultrasonic-assisted flame atomic absorption spectrometry with alkali solution extraction has been established.NH_(4)OH-NH4Cl solution with pH=11 is used as extracting agent,ultrasonic-assisted extraction is performed in hot water at 98±2℃ for 60min,centrifuged for separation,and then anhydrous sodium sulfate is added as signal intensifier for determination.The drawbacks of cumbersome extraction steps,generating a large amount of precipitation,and low separation efficiency in HJ1082-2019 method are avoided.The detection limit of the method is 0.49 mg/kg,the determination limit is 1.96 mg/kg,the relative standard deviation(RSD,n=6)is 2.9%~3.4%,and the recovery rate of participating is 94.2-100.8%.The method has the advantages of simple operation,high accuracy and high efficiency of batch processing samples.

关 键 词：原子吸收 超声 碱溶液 六价铬 土壤和沉积物 

分 类 号：O657.31[理学—分析化学] X833[理学—化学]