title: [Determination of trace chloride in sodium sulfate of analytical reagent-grade by valve-switching ion chromatography].
abstract: A valve-switching ion chromatography system was developed for the determination of trace chloride in sodium sulfate using a single pump, a suppressor, two valves and three columns. Using this technique, the trace chloride was eluted from the concentrator column (IonPac TAC-ULP1, 23 mm x 5 mm) to the analytical column (IonPac AS18, 250 mm x 4 mm), and the sulfate flowed to the waste. Under the optimized separation conditions, the method showed good linearity (r2 > 0.999) in the range of 0.03 - 1 mg/L and the average recoveries of chloride were 98.0% - 103.0% with the relative standard deviation less than 2%. The limit of detection was 0.01 mg/L (S/N = 3). The results demonstrated that this system has the advantages of high sensitivity, facile automation and simple sample pretreatment, which might be a promising approach for the determination of trace chloride in high-purity reagents.
authors.affiliation: Shanghai Lab, Thermo Fisher Scientific Inc., Shanghai 201203, China. njuttingting@163.com
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.forename: Nani
authors.initials: N
authors.lastname: Wang
authors.forename: Mingli
authors.initials: M
authors.lastname: Ye
authors.forename: Zhongyang
authors.initials: Z
authors.lastname: Hu
authors.forename: Guangwen
authors.initials: G
authors.lastname: Pan