摘要:
介绍了松花江哈尔滨段水系沉积物环境标准样品的研制方法,对其中21个无机元素进行定值。采集的水系沉积物样品经自然阴干、研磨、筛分、混匀、装瓶和灭菌等加工处理后,分层随机抽取18瓶样品,在0.25 g样品取样量条件下,以铜、铅、锌、砷、汞、铁和铝为代表元素进行均匀性研究,结果表明样品均匀性良好。在室温避光保存条件下,以铜、铅、锌、砷和汞为代表元素,采用线性模型进行稳定性研究,在15个月研制期间样品未观察到不稳定性。由11家协作实验室对水系沉积物标准样品中的21个无机元素进行定值研究,经统计检验分析评定出20个元素的标准值和不确定度,1个元素给出参考值。研制成的标准样品已应用于土壤或水系沉积物样品中无机元素的监测。
Abstract:
The development of an Environmental Reference Material for the analysis of inorganic elements in stream sediment is described. The stream sediments were collected from the Songhuajiang River in Haerbin and processed as follows: shady-dried, ground, sieved, blended, packed and radiation-sterilized. The homogeneity was verified by analyzing Cu, Pb, Zn, As, Hg, Fe and Al from 18 bottles selected randomly from different strata with sampling at 0.25 g sample size. The results indicate that the sample is homogeneous. Under the preservation conditions of room temperature and avoidance of light, the stability was studied by analyzing Cu, Pb, Zn, As and Hg. Data were treated using a linear model and no instability was observed for the past 15 months. The certified concentration values and uncertainties for 20 inorganic elements and reference values for 1 inorganic element were obtained by statistical analysis of the results from 11 qualified in-network laboratories. The relative uncertainties (k=3) were smaller than 15%. This method has been successfully applied to the determination of inorganics in soils and stream sediments.
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