A Novel Simplified Column-Switching Technique for the Determination of Traces of Bromate in High Concentration Matrices

摘要

The column-switching technique has been widely used to determine trace level ions in the presence of high concentration matrix.A novel simplified column-switching method is proposed where bromate(as a model compound)was determined using this technique.The switching time window was confirmed by the retention time of determined ions.This technique can completely carry out the same function as the other column-switching technique do,but only one extra ten-way injection valve coupled to ion chromatograph was used.By using column-switching technique,it is possible to determine 0.2 mu gL~(-1)bromate in the presence of 100 mgL~(-1)chloride by direct injection of 2000 mu L without any pretreatment and the relative standard deviation(RSD)of the peak height for the eleven successive injections of 0.2 mu gL~(-1)bromate solution is 23.1%.The detection limit for bromate is 0.09 mu gL~(-1),which showed the method was very sensitive.The technique has been applied to the determination of bromate in drinking water,and the spike recovery is in the range of 96-104%.