연속적 공침 선농축-수소화물 발생법을 이용한 ICP-AES에서의 비소의 감도 개선

Abstract

In a stream of aqueous sample, trace arsenic ions were quantitatively coprecipitated and detected in ICPAES through hydride generation. In was used as a coprecipitating reagent. The precipitate was collected on a filter and dissolved by HCl. The eluted As was sent into the reaction coil to generate hydrides and analyzed by ICP. With optimal conditions, and with a sample of 0.3 mL, an enrichment of 70 was obtained with the sampling speed of 10/hr. When compared with coprecipitation and hydride generation technique, the sensitivity was increased by 7 and 10 times, respectively. The limit of detection limit(3σ) was 0.020 μg L-1 and the precision was 7-10%. Separation of As3+ and As5+ were possible using citric acid in hydride generation.