Determination of the Sulfate Ion Concentration in Rain Water by Flow Injection Analysis Incorporated with a Barium Chloranilate Reaction Column

• Published in: Analytical Sciences Vol. 6; no. 5; pp. 711 - 714
• Main Authors: YAKATA, Kenshi, SAGARA, Fumio, YOSHIDA, Isao, UENO, Keihei
• Format: Journal Article
• Language: English
• Published: Tokyo The Japan Society for Analytical Chemistry 1990; Japan Society for Analytical Chemistry; Japan Science and Technology Agency
• Subjects: Analysis methods; Applied sciences; barium chloranilate reaction column; Exact sciences and technology; Flow injection analysis; natural water; Natural water pollution; Pollution; rain water; sulfate ion; Water treatment and pollution; Chemical analysis; Chemical reaction; Barium Compounds; Interelement effect; Organic salt; Rain water; Ions; Sulfates; Packed column; Photometry; Flow injection
• ISSN: 0910-6340; 1348-2246
• DOI: 10.2116/analsci.6.711

The concentration of sulfate ions in rain water was determined by a flow-injection method using a reaction column packed with barium chloranilate powder. Aqueous ammonium chloride (0.5%) containing 50% ethanol was used as a carrier at a flow rate of 1.9ml/ min. The chloranilate ion concentration, which corresponds to the sulfate ion concentration, in the carrier from the reaction column was monitored by a photometric detector at 530nm. Interferences by multivalent cations were eliminated with the use of a cation-exchange column inserted in the upper stream of the reaction column. The concentrations of sulfate ions in rain water (4-100ppm) were quickly determined (one sample per minute) with high reproducibility. The results agreed well with those obtained by the standard manual method.