R. Golombek, G. Schwedt
1986
Citations
0
Influential Citations
10
Citations
Journal
Journal of Chromatography A
Abstract
Abstract 2,4-Dihydroxybenzoic acid has been studied as an eluent for single column ion chromatography with indirect UV detection. The advantages of this eluent are discussed. Only low concentrations of 2,4-dihydroxybenzoic acid in the mobile phase are needed. Eighteen anions could be detected. The early eluting anions such as silicate and fluoride show well separated peaks and can be determined simultaneously with other common anions. The detection limit is e.g., 150 ppb for silicate (as Si) and 50 ppb for fluoride. It is shown that this method can be applied to the determination of anions in tap- and mineral-water samples. A baseline separation is obtained in about 20 min. Many other applications are possible because of the high resolution of this system, thus also silicate, phosphate and arsenate can be separated. The loss of ion-exchange capacity poses no problem since a decrease in the concentration of 2,4-dihydroxybenzoic acid results in almost the same chromatogram as before.