摘要
采用火焰原子吸收分光光度法(FAAS)测定土壤和沉积物中铜Cu、锌Zn、铅Pb、镍Ni、铬Cr,根据测定结果分析该方法的标准曲线相关系数R、检出限MDL、精密度和正确度(包括准确度和加标回收率)等性能参数.实验结果表明,FAAS分析测定Cu、Zn、Pb、Ni和Cr含量在0～2.5 mg/L范围内线性关系较好.FAAS测定Cu、Zn、Pb、Ni和Cr的方法检出限分别为1,0.3,2,2,1 mg/kg;测定下限分别为4,1.2,8,8,4 mg/kg;FAAS测定Cu、Zn、Pb、Ni和Cr精密度在0.7％～17.2％.FAAS测定土壤和沉积物中Cu、Zn、Pb、Ni和Cr标准样品的总体相对误差范围为-2.7％～1.1％,表现出较高的准确度.FAAS的实际样品加标回收测试中,加标回收率范围为80％～119％,满足标准方法要求.
Abstract
Flame Atomic Absorption Spectrophotometry(FAAS)was used to determine Cu,Zn,Pb,Ni and Cr in soil and sediment,and the performance parameters of the method,such as correlation coefficients of the standard curves,limits of detection,precision and accuracy,were analyzed according to the results.The experimental results showed that the linearity of FAAS analysis for the determination of Cu,Zn,Pb,Ni and Cr content was good in the range of 0 mg/L to 2.5 mg/L.The method detection limits of FAAS for the determination of Cu,Zn,Pb,Ni and Cr were 1,0.3,2,2 and 1 mg/kg,respectively;and the lower limits of determination were 4,1.2,8,8 and 4 mg/kg,respectively;and the precision of Cu,Zn,Pb,Ni and Crmeasoried was in the range of 0.7％～17.2％.The overall relative errors of FAAS for the determination of Cu,Zn,Pb,Ni and Cr standard samples in soil and sediment were in the range of-2.7％～1.1％,which demonstrated a high accuracy.In the astual sample spiking recovery test of FA AS,the spirking recorery rate ranges from 80％to 119％.
基金项目
国家环境保护重金属污染监测重点实验室开放基金(SKLMHM202216)
NETL
NSTL
万方数据