Total nitrogen nitrites Metal contaminants (Cadmium, Lead, Mercury, Arsenic, Tin) Residues of nitrofuran metabolites (AOZ-AMOZ) Waste phenicols (Chloramphenicol) Organochlorine Pesticide Residues Detection of Listeria monocytogenes Determination of E. coli O157 Coagulase positive Staphylococcus count Method: