石墨炉原子吸收光谱法和电感耦合等离子体发射光谱法测定土壤中铅和镉的方法比较被引量：11

Comparison of graphite furnace atomic absorption spectrometry and inductively coupled plasma optical emission spectrometry in the determination of Pb and Cd in soil

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摘要目的分别采用石墨炉原子吸收光谱法(GF-AAS)和电感耦合等离子体发射光谱法(ICP-OES)测定同一土壤样品中的铅(Pb)和镉(Cd),并比较2种测定方法的优劣。方法采用盐酸-硝酸-氢氟酸-高氯酸全消解的方法,彻底破坏土壤的矿物晶格,使样品中的待测元素全部进入消化液中。然后分别以标准溶液和样品消化液为样品,确定2种测定方法的最优参数设置后测定标准样品。结果仪器参数优化并基体匹配后,两法的标准曲线相关系数均>0.999。GF-AAS测定Pb、Cd的相对标准偏差(RSD)分别为1.55%~5.10%和2.75%~5.54%;ICP-OES的RSD分别为1.15%~2.21%和1.35%~3.42%。GF-AAS测定标样Pb、Cd回收率分别为80.6%~92.4%和75.3%~100.5%;ICP-OES分别为91.0%~102.9%和85.0%~110.1%。结论2种测定方法均可用于土壤中Pb、Cd测定,且校准曲线基体匹配后,ICP-OES法测定土壤中Pb、Cd元素结果的准确性和精密度均优于GF-AAS法。 Objective Lead(Pb)and cadmium(Cd)in the digested solution of the same soil sample were determined by graphite furnace atomic absorption spectrometry(GF-AAS)and inductively coupled plasma optical emission spectrometry(ICP-OES),so as to compare the advantages and disadvantages of the two methods.Methods Hydrochloric acid-nitric acid-hydrofluoric acid-perchloric acid digestion method was used to completely destroy the mineral lattice of the soil,so that all the elements in the sample were put into the digestive juice.Then,the standard samples and sample digests were used as samples to determine the optimal parameters of the two methods and the standard samples were determined by the two methods simultaneously.Results After the instrument parameters were optimized and the matrix was matched,the correlation curves of the two methods were greater than 0.999.The relative standard deviations(RSDs)of Pb and Cd for GF-AAS ranged from 1.55%to 5.10%and 2.75%to 5.54%,respectively,while the RSDs for ICP-OES were within 1.15%-2.21%and 1.35%-3.42%,respectively.The recovery rates of Pb and Cd for GF-AAS were within 80.6%-92.4%and 75.3%-100.5%,respectively and the recovery rates of Pb and Cd for ICP-OES were within 91.0%-102.9%and 85.0%-110.1%,respectively.Conclusion Both methods can be used for the determination of Pb and Cd in soil.After the calibration curve matrix is matched,the accuracy and precision for ICP-OES are better than that for GF-AAS.

作者魏竞智郭磊磊李徐凤 WEI Jing-zhi;GUO Lei-lei;LI Xu-feng(Jintan District Center for Disease Control and Prevention,Changzhou,Jiangsu 213200,China)

机构地区常州市金坛区疾病预防控制中心

出处《中国卫生检验杂志》 CAS 2020年第7期797-801,共5页 Chinese Journal of Health Laboratory Technology

关键词铅镉石墨炉原子吸收光谱法电感耦合等离子体发射光谱法土壤 Lead Cadium Graphite furnace atomic absorption spectrometry Inductively coupled plasma optical emission spectrometry Soil

分类号 O657.31 [理学—分析化学]