Jan 01, 2018 · Determination of Phosphine Residues in Wheat and Yellow Corn with a New Developed Method Using Headspace and SIM Mode GC-MS. Thabit TMAM(1), Elgeddawy DIH(2). Author information: (1)Agricultural Research Center, Central Agricultural Pesticides Laboratory, Giza 12611, Egypt; Saudi Arabia Grains Organization, Riyadh 11471, Kingdom of Saudi Arabia.