用GC-ECD测定水中痕量溴酸根的方法

研究了用GC-ECD测定水中痕量溴酸盐浓度的方法,优化了用工程丙酮作溴酸根衍生化试剂的反应条件.在最佳衍生反应条件下、溴酸根浓度为3.8～92 μg·L-1范围内,溴酸根浓度和相应溴代衍生物的峰面积有良好的线性关系(R2=0.9954).本方法的检出限为0.75 μg·L-1,测定系列浓度溴酸根水溶液的相对偏差(RSD)均小于5%,样品加标平均回收率为105.1%～107.6%.在正常臭氧氧化时间内测定臭氧氧化后的过滤水中的溴酸根浓度时,只要臭氧投量与TOC比值大于0.8 mg·mg-1,溴酸根的测定就不受本底天然有机物的影响.

Determination of trace bromate in water with GC-ECD

A novel method for the determination of trace bromate in water is proposed which employ GC-ECD. The derivative process with acetylacetone is optimized. Under the optimal conditions, a good linear relationship (R2=0.9954) between the bromate concentrations (3.8~92 g·L-1) and the peak-areas of the bromo-derivatives is obtained. The detection limit (MDL) of this method is 0.75 g·L-1. The average recovery rates for the samples are 105.1%~107.6% with relative standard deviation (RSD) less than 5%. With respect to the examination of the bromate in the filtrated surface water after ozonation, the natural organic matters would have less negative effect on the examination, when the ratio of ozone dose to TOC is higher than 0.8mg·mg-1 under the normal ozonation time.