Spectrophotometric determination of phosphine residues in rice.
Phosphine residues were determined in 2 types of rice samples, raw polished and parboiled. The yellow chromophore due to phosphine from raw polished rice had 2 absorption maxima, a strong one at 370-380 nm and a weaker one at 400-410 nm. The chromophore from parboiled rice also had 2, one at 390-400 nm and the other at 410-420 nm. A closed system containing rice and a phosphine tablet or powder yielded 93-99% recovery of fortified phosphine. At any given dose of phosphine, parboiled rice retained a higher amount of residue after aeration than did raw polished rice.
D002849:Chromatography, Gas; D005506:Food Contamination / Q000032:analysis; D012275:Oryza / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010720:Phosphines / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
D010573:Pesticide Residues; D010720:Phosphines