【摘要】 通过国内多家实验室测定的大量数据,研究了分光光度法测定水中六价铬的质量控制指标,旨在为环境监测工作提供质量控制指标和依据。研究表明:样品质量浓度在0.04～0.5mg/L范围内,标准样品室内相对标准偏差(RSD)≤4%,室间相对标准偏差(RSD’)≤15%,相对误差(RE)≤±10%(低浓度可适当放宽)。实际样品质量浓度在0.004～0.8mg/L范围时,相对偏差≤10%。空白加标回收率为80%～95%,标准样品和实际样品的加标回收率为80%～115%。更多还原

【Abstract】 On the basis of a large number of monitoring data from many national laboratories , the quality control index of the Cr(Ⅵ)were studied. The purpose was to provide QC index for environmental monitoring. This Study showed that the RSD (within-laboratory relative standard deviation) was less than 4.0%; RSD′(inter-laboratory relative standard deviation) was less than 15%; and the relative error was controlled within ±10% (low concentrations could be appropriately larger) when the concentration was between 0.04mg/L and 0.5mg/L. Relative deviation of actual samples whose concentrations were between 0.004 mg/L and 0.8mg/L was controlled within 10%. The corresponding recovery of the blank sample ranged from 80% to 95%, while the corresponding recovery of the standard samples and the actual samples ranged from 80% to 115%.更多还原