离子色谱法测定饮用水和面包中的溴酸根

THE DETERMINATION OF BROMATE IN DRINKING WATER AND BREAD BY ION CHROMATOGRAPHY

选用AS9-HC高容量阴离子交换色谱柱,不需预处理除去干扰离子,可直接进样。测定了两种水样,其中一种检出溴酸根。方法检出限0.005mg·1^(-1),水样加标回收率91.3—93.4％,采用全新的自动化样品处理技术——加速溶剂萃取(Accelerated Solvent Extraction)萃取面包中的溴酸根,经AS9-SC阴离子交换色谱柱分离,选择最佳淋洗条件,电导检测。方法检出限0.07mg·1^(-1),对十二种市售面包进行测定,均未检出溴酸根,样品加标回收率79.9—114％。

The development and application of two methods for determining bromate in drin-king water and bread by ion chromatography are described. Without pretreatment to remove chloride. We can using AS9-HC column to determine bromate in drinking water by direct injection. The detection limit was 0. 005mg · l-1. Of the two drinking water samples, one was detected to contain bromate while another was not. The spiked recoveries were in the range of 91. 3-93. 4%. Using AS9-SC column,we developed opti-mum eluent to determine bromate in bread, The detecion limit was 0. 07mg · l-1. All of the twelve bread samples contained less than the detection limit of bromate. The spiked recoveries were in the range of 79.6-114%. Bromate was extracted from bread with water and required no further pretreatment. Conventional manual extraction was con-trasted with a new technique——accelerated solvent extraction (ASE). The resultssuggested that ASE had good recoveries.