A spectrophotometric method has been developed for the determination of certain organophosphorus pesticides. It involves the reaction of 4-(4-nitrobenzyl)pyridine with the pesticide in an acetone-water-ethanol mixture at 100 °C to produce the dye precursor. The colour is produced after the addition of tetraethylenepentamine.
C. R. Turner, Analyst, 1974, 99, 431 DOI: 10.1039/AN9749900431
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