A new palladium chelate compound for determination of sulfide

Add time:07/31/2019    Source:sciencedirect.com

A new palladium chelate compound is described for the determination of sulfide in aqueous samples. The reagent, bis(2-aminobenzoate)palladium(II) (PdA2), was prepared by reaction of tetrachloropalladate (PdCl4−) with 2-aminobenzoic acid. The compound was characterized by infrared spectroscopy and CHN elemental analysis. The measurement was based on the selective reaction of PdA2 with sulfide in an aqueous medium, which quantitatively produced fluorescent 2-aminobenzoate (λex = 245 nm, λem = 410 nm). The analytical response was linear in the range 0.10–20.0 μmol (S2 −) L− 1 (r > 0.99), with a limit of detection of 0.075 μmol L− 1 and repeatability (RSD) of 3.4%. There was no interference from CO32 −, NO3−, Cl−, SO42 −, Br−, NO2−, K+, NH4+, Na+, citrate or S2O82 −. The fluorescence intensity decreased in the presence of H3CCOO−, PO43 − and SCN−, while OH− caused a positive interference. The new fluorescent compound was successfully applied for the determination of sulfide in synthetic wastewater and natural water sample. The advantages of the proposed palladium chelate are absence of toxic by-products, simple synthesis procedure of reagent and yield reaction of about 85%, easy handling and fast acquirement of analytical signal.

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