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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 51, Number 4
JKCSEZ 51(4)
August 20, 2007 

 
Title
Direct and Derivative Spectrophotometric Determination of Cobalt (II) in Microgram Quantities with 2-Hydroxy-3-methoxy Benzaldehyde Thiosemicarbazone

2-Hydroxy-3-methoxy Benzaldehyde Thiosemicarbazone를 사용하여 마이크로 그램 코발트(II)의 직접 및 유도 분광광도법에 의한 정량
Author
A. Praveen Kumar, P. Raveendra Reddy*, V. Krishna Reddy

A. Praveen Kumar, P. Raveendra Reddy*, V. Krishna Reddy
Keywords
분광광도법, 코발트 정량, HMBATSC , Spectrophotometry, Determination of cobalt, HMBATSC
Abstract
분석 시약으로 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC)를 사용하여 코발트 (II) 정량을 위하여 빠르고 간단하고 민감한 분광광도법을 개발하였다. 액상에서 금속이온이 pH 6.0에서 HMBATSC와 갈색의 착물을 형성하였다. 이 착물은 375 nm와 390 nm에서 두 개의 최대 흡수 피크를 보였다. 375 nm에서 많은 흡 수를 보였고, 반면 390 nm에서는 분명한 흡수를 보이지 않았다. Beer’s 법칙에서 Co(II)는 0.059-2.357 μg ml-1 범위를 보였다. 이 방법의 몰 흡수와 Sandall’s 민감도는 각각 2.74×104 l mol-1 cm-1와 0.0024 μg cm-2 였다. 여러 가지 다른 이온들에 간섭에 대해서도 연구하였다. 화학양론적으로 착체는 1:2 [Co(II)- HMBATSC] 이 였다. 이차 유도 분광광도 법에 의한 Co(II)의 정량방법에 대해서도 제안하였다. 제안된 방법을 alloy steels, 비타민 B12와 생물학 시료에 있는 Co(II)의 정량에 적용하였다.

A rapid, simple and sensitive spectrophotometric method was developed for the determination of cobalt(II) using 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC) as a analytical reagent. The metal ion in aqueous medium forms a brown coloured complex with HMBATSC at pH 6.0. The complex has two absorption maxima at 375 nm and 390 nm. At 375 nm, the reagent shows considerable absorbance, while at 390 nm the reagent does not shows appreciable absorbance. Hence, analytical studies were carried out at 390 nm. Beer’s law is obeyed in the range of 0.059-2.357 μg ml-1 of Co(II). The molar absorptivity and Sandall’s sensitivity of the method are 2.74×104 l mol-1 cm-1 and 0.0024 μg cm-2 respectively. The interference of various diverse ions has been studied. The complex has 1:2 [Co(II)- HMBATSC] stoichiometry. A method for the determination of cobalt(II) by second order derivative spectrophotometry has also been proposed. The proposed methods were applied for the determination of cobalt(II) in alloy steels, vitamin B12 and in some biological samples.

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