Abstract

Md. Faridur Rahman^1*, Aniruddha Chakraborty² and Tanmoy Das¹

DOI : http://dx.doi.org/10.13005/ojc/310471

Thiophene-2-carboxaldehyde thiosemicarbazone has been successfully applied as an analytical reagent for micro level solid phase spectrophotometric determination of As (III) at pH 3.5. Here it can be seen that arsenic reacts with the new chelating ligand in acidic medium to form the As (III)-tctsc complex. The complex showed maximum absorbance at λ _max 281 nm for As (III) ions. The Beer’s law range was 0.1-1.0 mg/L. Job’s method and Mole-ratio method showed that As (III)-ligand ratio in the complex is 1:2. The Molar absorptivity and Sandell’s sensitivity were 5.96 x 10⁴ L mol^-1 cm^-1 and 0.01μg/cm² respectively for As (III) ions. The proposed method has been successfully applied to the determination of arsenic in drinking water samples of Kaliachak, in the district of Malda, West Bengal, India.

Arsenic-tctsc Complex; Drinking Water Samples; Solid Phase Spectrophotometric (SPS) Determination

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