In both plants and animals zinc phosphide is hydrolysed to phosphine. In animals, the
phosphine formed is either expired or slowly oxidised to hypophosphite, phosphite and
phosphoric acid Zinc phosphide releases phosphine on hydrolysis. As the analytical methods employed to
measure residues of metallic phosphides in plant and animal tissues are based on the
determination of phosphine, the residue definition for zinc phosphide should be the same as
for other metal phosphides,