oa South African Journal of Chemistry - Study on the solid phase extraction and spectrophotometric determination of mercury in water and biological samples with 5-(p-aminobenzylidene)-thiorhodanine

Volume 58, Issue 1
  • ISSN : 0379-4350



This paper presents the synthesis and application of 5-(p-aminobenzylidene)-thiorhodanine (ABTR) as a new chromogenic reagent for the determination of mercury. Based on the rapid reaction of mercury(II) with ABTR and the solid phase extraction of the coloured chelate with a C disk, a highly sensitive, selective and rapid method for the determination of mercury has been developed. In the presence of pH 3.5 sodium acetate-acetic acid buffer solution and emulsifier-OP medium, ABTR reacted with mercury(II) to form a red chelate in a molar ratio 1:2 (mercury to ABTR). This chelate was enriched by solid phase extraction with a C disk and eluted from the disk with dimethyl formamide (DMF). An enrichment factor of 50 was achieved. The molar absorptivity of the chelate in DMF was found to be 1.21 x 105 L mol-1 cm-1 at 555 nm. Beer's law was obeyed in the range of 0.01~ 3 g mL-1. The relative standard deviation for eleven replicates with a concentration of 0.01 g mL-1 was 1.98%. This method was applied with good results to the determination of mercury in water and biological samples.

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