| Geochemical sampling with special reference to environmental risk assessment |
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| 引用本文： | Weidong YANG Baojin ZHAO William Pulle. Geochemical sampling with special reference to environmental risk assessment[J]. 中国地球化学学报, 2006, 25(B08): 25-26 |
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| 作者姓名： | Weidong YANG Baojin ZHAO William Pulle |
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| 作者单位： | [1]Department of Geology, Universlty of Fort Hare, Private Bag X1314, Alice, 5700, South Africa [2]Pulles Howard ＆ De Lange Inc.Auckland Park, Johannesburg, 2006, South Africa |
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| 摘 要： | We usually conduct environmental investigation through sample study. Therefore, it is essential that samples should be representative, at all time, and of the object be studied. However, the issues of sample representativeness and sampling errors are often neglected by investigators. Based on modem geo-statistics and sampling theory, this paper addresses these issues in more detail and presents a case study related to environmental risk assessment. The issue of sample representativeness can be measured in the following three aspects： （1） whether the sample numbers are large enough to reflect the characteristics of the initial object being studied）; （2） whether the sample mass （or sample volume） is large enough to represent the original site （the local segment being sampled）; （3） whether assay portion is prepared well enough to depict the initial sample. Sample numbers are dictated by the confidence level, the variance of population and the acceptable estimation error as well as the homogeneity and the spatial continuity of population.
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| 关 键 词： | 地球化学 环境危险评估 取样质量 环境调查 |
Geochemical sampling with special reference to environmental risk assessment |
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| Abstract: | |
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| Keywords: | geochemical sampling environmental risk assessment sample number sample mass sample preparation error |
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