การวิเคราะห์แอนไอออนบางชนิดที่มีซัลเฟอร์เป็นองค์ประกอบในขณะเดียวกันด้วยเทคนิคไอออนโครมาโทกราฟี / อุมาพร สุขม่วง = Simultaneous determination of some sulphur containing anions by ion chromatography / Umaporn Sukmoung
The analytical methods for determination of some anions containing Sulphur atom namely sulphide , sulohite , sulphate , thiosulphate and thiocyanate by ion chromatography were investigated. Two types of anion exchange column, PRP-X 100 and IC-PAK A were used throughout the experiments hydroxybenzoate solution, sodium benzenesulfonate solution and the solvent mixture system of gluconate-borate were employed. The various parameters for the suitable separation of these ions by each type of column e.g., the concentration and pH of the eluent, the amount of organic modifiers added and the flow rate were investigated. In addition, the interferences of common anions usually present in water for example, chloride, fluoride, bromide, iodide, nitrate and nitrite were also investigated. In this study, the optimal conditions for chromatographic separation applicable to the determination of these five anions simultaneously were the solvent system of gluconate-borate containing 1.0 mM gluconate, 1.1 mM borate, 90.0 mM boric acid, 54.0 mM glycerol, 0.02 mM EDTA disodium salt and 16.0 % acetonitrile, the IC-PAK A column, the pH value of 7.35 and the flow rate of 1.2 mL per minute. The accuracy and precision of the analyses are in the range of 93.75 to 99.88 % and 1.14 to 10.19 % respectively.