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2005•Journal of Yunnan University for NationalitesRequires access

Spectrophotometric Determination of Cobalt in Water with 2-(2-Quinolinlazo)-4,5-Dimethylhydroxybenzen

Mei‐Xiang Wang

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Abstract

The color reaction of cobalt(II) with 2-(2-Quinolinlazo)-4,5-Dimethylhydroxybenzen was studied. In the presence of pH = 3.6 HAc-NaAc buffer solution and SDSmedium, QADMP reacts with cobalt (Ⅱ) to form a stable 2∶1 complex. In the measured solution, the molar absorption is1. 2.31×10~4 L·mol~(-1)·cm~(-1). at λ_(max)=575nm. Beer's law was obeyed in range of 0～20.0μg/25mL. This method can be applied to the determination of cobalt in water with satisfactory results.

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What this paper is about

The color reaction of cobalt(II) with 2-(2-Quinolinlazo)-4,5-Dimethylhydroxybenzen was studied. In the presence of pH = 3.6 HAc-NaAc buffer solution and SDSmedium, QADMP reacts with cobalt (Ⅱ) to form a stable 2∶1 complex. In the measured solution, the molar absorption is1. 2.31×10~4 L·mol~(-1)·cm~(-1). at λ_(max)=575nm. Beer's law was obeyed in range of 0～20.0μg/25mL. This method can be applied to the determination of cobalt in water with satisfactory results.

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Available abstract

The color reaction of cobalt(II) with 2-(2-Quinolinlazo)-4,5-Dimethylhydroxybenzen was studied. In the presence of pH = 3.6 HAc-NaAc buffer solution and SDSmedium, QADMP reacts with cobalt (Ⅱ) to form a stable 2∶1 complex. In the measured solution, the molar absorption is1. 2.31×10~4 L·mol~(-1)·cm~(-1). at λ_(max)=575nm. Beer's law was obeyed in range of 0～20.0μg/25mL. This method can be applied to the determination of cobalt in water with satisfactory results.

Key concepts: Cobalt, Chemistry, Buffer solution, Spectrophotometry, Molar ratio, Color reaction, Absorption (acoustics), Nuclear chemistry

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