Determination of target xenobiotics and unknown compound residues in food environmental and biological samples Xenobiotics are chemical compounds foreign to a given biological system. In animals and humans xenobiotics include drugs drug metabolites and environmental pollutants. In the environment xenobiotics include synthetic pesticides herbicides and industrial pollutants. Many techniques are used in xenobiotics residue analysis; the method selected depends on the complexity of the sample the nature of the matrix analytes and the analytical techniques available. This reference will help the analyst develop effective and validated analytical strategies for the analysis of hundreds of different xenobiotics on hundreds of different sample types quickly accurately and at acceptable cost