原子吸收法测定水中镉的质量控制指标研究

摘要

通过全国多家实验室的大量监测数据,研究分析了镉测定的质量控制指标,并与《水质镉的测定双硫腙分光光度法》（GB/T 7471-1987）和《环境水质监测质量保证手册》（第二版）进行了比较,旨在为环境监测工作提供质量控制依据和质量控制指标。研究表明,标准样品的精密度质量控制指标范围：RSD≤5.0%和RSD’≤8.0%;准确度质量控制指标范围：RE≤±10.0%、重复性限和再现性限分别为0.003 24~0.021 4 mg/L和0.010 9~0.102 mg/L;空白样品、标准样品和实际样品的加标回收率范围分别为100.0%~120%、90.0%~110%和90.0%~110%。%On the basis of a large number of monitoring data from many laboratories nation-widely,we analyzed the quality control index of the Cd in water by atomic absorption spectrometry method,and compared with the QC index in GB/T 7471-1987 and environmental monitoring of water quality assurance manual（the second edition）.The purpose of which was to provide the QC reference and QC index for the people in the monitoring area.Studies indicate that the within-laboratory relative standard deviation contro1 limit was less than 5% and the between-laboratory relative standard deviation control limit was less than 8% of standard samples.The relative error of the standard samples was limited 10%,The repeatability limit was 0.003 24~0.021 4 mg/L and the reproducibility limit was 0.010 9~0.102 mg/L.The corresponding recovery rates was less than 100%~120%（blank sample） and 90~110%（standard samples and actual samples）.