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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 52, Number 2
JKCSEZ 52(2)
April 20, 2008 

Preconcentration of Ultra Trace Amounts Bismuth in Water Samples Using Cloud Point Extraction with Na-DDTC and Determination by Electrothermal Atomic Absorption Spectrometry (ET-AAS)

Na-DDTC로 흐림점 추출을 사용한 물시료에서 초미량 비스머스의 예비농축
Ali Moghimi*

Ali Moghimi*
흐림점 추출, 비스머스, 전열 원자 흡수 분광법, Natrium diethyldithiocarbaminat (Na-DDTC), 수도물 , Cloud Point Extraction, Bismuth, Electrothermal Atomic Absorption Spectrometry, Natrium Diethyldithiocarbaminat(Na-DDTC), Tap Water
흐림점 추출- 전열 원자 흡수 분광법에 대한 새로운 시도가 비스머스 측정에 사용되었다. 수용액 분석물은 황산으로 산성화하였다(pH 3.0-3.5). Triton X-114는 계면활성제로 가하였고, natriumdiethyldithiocarbaminat(Na- DDTC)는 착체 시약으로 사용했다. 혼합물의 흐림점 분리를 기저로한 50℃에서 상분리 후에 많은 계면활성제는 tetrahydrofuran(THF)로 희석했다. 농축 용액의 20 μL와 화학개질제로 0.1% (w/v) Pd(NO3)2를 10 μl 그라파이트 튜브 안으로 분산시켰다. 분석물은 전열 원자 흡수 분광법으로 측정했다. 추출 조건과 기기 파라메타의 최적화 후에 195의 예비 농축 인자를 10mL의 시료에서 얻었다. 검출한계는 0.04 ng ml1 분석곡선은 0.04-0.70 ng mL1의 농도범위에서 선형을 얻 었다. 상대표준편차는 5% 보다 적었다. 이 방법은 성공적으로 추출과 물시료에서 비스머스 추출과 검출에 적용되었다.

A new approach for a cloud point extraction-electrothermal atomic absorption spectrometric method was used for determining bismuth. The aqueous analyte was acidified with sulfuric acid (pH 3.0-3.5). Triton X-114 was added as a surfactant and natriumdiethyldithiocarbaminat (Na-DDTC) was used as a complexing agent. After phase separation at 50℃ based on the cloud point separation of the mixture, the surfactant-rich phasen was diluted using tetrahydrofuran (THF). Twenty microliters (20 μL) of the enriched solution and 10 μl of 0.1% (w/v) Pd(NO3)2 as chemical modifier were dispersed into the graphite tube and the analyte determined by electrothermal atomic absorption spectrometry. After optimizing extraction conditions and instrumental parameters, a preconcentration factor of 195 was obtained for a sample of only 10 mL. The detection limit was 0.04 ng ml-1 and the analytical curve was linear for the concentration range of 0.04-0.70 ng mL-1. Relative standard deviations were <5%. The method was successfully applied for the extraction and determination of bismuth in water samples.

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