1. Central Food Laboratories, Ministry of Public Health, Doha 42, Qatar
2. Central Lab. Of Residue Analysis of Pesticides and Heavy Metals in Foods (QCAP), Agricultural Research Center, Ministry of Agriculture and Land Reclamation, 7 Nadi El- Said Street, Dokki, Giza, 12311, Egypt
3. Department of Environmental Science, Faculty of Science, Port Said University, Port Said, 42522, Egypt