微库仑法和离子色谱法测定土壤中可吸附有机卤素

Determination of Adsorbable Organic Halogen(AOX)in Soil by Microcoulometry and Ion Chromatography

采用振荡吸附处理土壤样品,用微库仑法和离子色谱法分别测定土壤中的可吸附有机卤素(AOX)。通过优化样品前处理条件以提高AOX的提取效率,上述两种方法检出限分别为15.3 mg/kg和16.3 mg/kg,4-氯苯酚作为标准物质的加标回收率分别为92.2%~95.0%和77.7%~80.2%。两种方法测定实际土壤样品中AOX,6次测定结果的RSD为5.4%~19.2%。GSS系列标准土壤试验结果表明,振荡吸附处理样品,用微库仑法和离子色谱法在测定样品中AOX时测定结果区别不大,土壤中AOX含量与卤素含量无直接关系。

Adsorbable organic halogens(AOX)in soil samples were pretreatment by oscillating adsorption,and determined by microcoulometry and ion chromatography,respectively.By optimizing sample pretreatment conditions to improve the extraction efficiency of AOX,the detection limits of the two methods were 15.3 mg/kg and 16.3 mg/kg,and the spiked recoveries of 4-chlorophenol reference material were from 92.2%to 95.0%and from 77.7%to 80.2%,respectively.The RSDs of 6 measurements of AOX in actual samples by the two methods ranged from 5.4%to 19.2%.The determination results of GSS series soil reference materials showed that there was no significant difference between the results by microcoulometry and ion chromatography,with oscillating adsorption pretreatment,and there was no direct relationship between AOX content and halogen content in soil.