Indirect atomic absorption spectrometric determination of dimethoxydithiophosphate with back-extraction

摘要: Two methods for the indirect determination of dimethoxydithiophosphate (DDTP) are described, based on extraction complexes formed by this species with copper and bismuth; these were subsequently back-extracted into an aqueous medium to determine metals atomic absorption spectrometry. The Cu(DDTP)2 complex was extracted CHCl3 a 0.2 M NH4+-NH3 buffer (pH 10), Bi(DDTP)3 CCl4 10–2M solution ammonium oxalate. precision, detection limit final recovery method involving 0.8%, 4.4 × 10–3µmol DDTP (4.4 10–7M in solution) 92.7%, respectively, while those bismuth 0.9%, 2.2 10–2µmol (2.2 10–6M 95.8%, respectively. potential interference some cationic other pesticides also investigated. Both applied malathion, derivative, agricultural formulation.