北京市重金属污染土壤成分分析标准物质研制

Preparation of Heavy Metal Contaminated Soil Reference Materials of Beijing for Chemical Composition Analysis

为了更好地配合全国农用地土壤污染详查计划,使测试数据质量得到监控。研制了3个北京市重金属污染土壤成分分析标准物质,样品采自北京市通州区永乐店镇德仁务村、平谷区刘家店孔城峪村、昌平区南口镇南口农场三分场,样品类型覆盖了北京市农用地土壤的主要类型。经检验表明样品的均匀性和稳定性良好。选择不同系统具有国家级计量认证资质的11家实验室参与定值测试工作,定值元素64项,尽量选用2种以上不同原理的已知准确的可靠的分析方法,按照规范要求对数据进行统计处理和异常值剔除,给出了3个候选物样品的推荐值和不确定度结果。

In order to better coordinate with the national soil pollution survey plan,the quality of test results can be monitored.Three reference materials for the analysis of soil composition of heavy metal pollution in Beijing were developed.Samples were collected from Derenwu Village of Tongzhou District,Kongchengyu Village of Pinggu District and Nankou Farm of Changping District.The sample types covered the main types of Beijing agricultural land soil.The test results showed that the homogeneity and stability of the samples were good.The results from 11 laboratories which had the national level measurement authentication qualification were combined to confirm certified values and uncertainty of 64 components.The certified values and uncertainties of three candidate samples were given by using two or more known,accurate and reliable analysis methods with different principles.According to the requirements of the specification,the results were statistically processed and outliers were removed,and the recommended values and uncertainties of 3 candidate samples were given.