Abstract
The compound 3-nitrosalicylaldehyde thiosemicarbazone (3-NSTS) is proposed as a new photometric reagent for the extractive spectrophotometric determination of Co (II). It reacts with Co (II) and form a stable colored complex in the pH range 5.5 to 6.5. This was well extracted in n-butanol. The absorption spectrum of Co (II): (3-NSTS) complex in n-butanol shows maximum absorbance at 460 nm. The system obeyed Beer's law up to 2–6 μg cm−3. The molar extinction coefficient was found to be 8.846 × 103 L mol−1cm−1 and the sensitivity of the method as defined by Sandell's sensitivity was 6.688 × 10−3 μg cm−2. The Composition of the extracted species was determined by Job's continuous variation method, mole ratio method and slope ratio method and it was found to be 1:2. The proposed reagent is satisfactorily applied for the determination of trace amount of Co (II) from synthetic and commercial samples.
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