Abstract
Spectrophotometric method for the determination of phosphine (PH3) residues in coriander has been developed based on the reaction of phosphine with silver nitrate in 2% aqueous isopropanol. The yellow chromophore formed has an absorption maximum at 430 nm and the linear relation between the absorbances at 430 nm and the concentration of PH3 is obeyed in the range of 0.02 to 0.17 μg. The method is sensitive with a detection limit of 0.008 μg and can be applied for determination of 0.02 μg/g residue in coriander. Recovery of added PH3 from a closed system ranges from 96 to 101%.
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