土壤监测中环境和农业行业标准分析方法的等效性评价

Equivalence of Environmental and Agricultural Standard Analysis Methods in Soil Monitoring

为评估土壤监测过程中环境和农业行业不同标准分析方法得到监测数据的可统筹性,运用多种统计方式,对土壤pH值、有机质、阳离子交换量、铜、锌、铅、镍、镉、铬、汞和砷共11个监测指标所采用的标准分析方法的等效性进行分析。技术规范比对结果显示:环境和农业行业,在土壤样品的采集、保存和制备过程所采用的技术规范,对分析结果的影响不大。方法性能指标结果显示:2类标准分析方法的精密度没有显著性差异。显著性检验结果显示:除pH值和汞外,其他9个指标均有显著性差异。等效性评价(等效边界为±20%)结果显示:测定pH值、有机质、阳离子交换量、铜、锌、镍、汞和砷8个指标的2类标准分析方法是等效的,所得监测数据可以共享。方法性能评价和显著性检验无法定量给出方法间差异的范围,而双单侧检验则弥补了这种不足,还避免了因样本量不足或精密度过高而引起的显著性误判,因此可根据该研究的评价结果对环境和农业行业土壤环境质量监测网络进行整合管理,有助于更加全面地掌握农用地土壤环境的污染现状。

To evaluate the comprehensibility of monitoring data obtained from different standard analysis methods in the environmental and agricultural fields during soil monitoring,this study used multiple statistical methods to analyze the equivalence of standard analysis methods used for 11 monitoring indicators,including soil pH value,organic matter,cation exchange capa-city,copper,zinc,lead,nickel,cadmium,chromium,mercury,and arsenic.The comparison results of technical specifications show that in the fields of environment and agriculture,the technical specifications used in the sampling,preservation,and preparation of soil samples have little impact on the analysis results.The results of method performance indicators show that there is no significant difference in precision between the two types of standard analysis methods.The significance test results show that except for pH value and mercury,there are significant differences in the other 9 indicators.When the equivalence boundary is±20%,the results of equivalence evaluation show that the two standard analysis method sets for measuring pH value,organic matter,cation exchange capacity,copper,zinc,nickel,mercury,and arsenic are equivalent,and the monitoring data obtained can be shared.The performance evaluation and significance testing of methods cannot quantitatively determine the range of differences between method sets,while the double unilateral test compensates for this deficiency and avoids misjudgment of significance caused by insufficient sample size or high precision.Therefore,the evaluation results of this study can be used to integrate and manage the soil env-ironmental quality monitoring network in the environmental and agricultural fields,which can achieve a more comprehensive understanding of the pollution status of agricultural soil environment.