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we compare me amount oi pesticide residue in the test solution with a known amount of standard and convert our findings to parts per million on the original apple sample.”
The search gets harder every year as the field of pesticides is constantly changing toward less residual pesticides and the laboratories are finding less and less residue. The amount of each pesticide allowable on food is set by the Food and Drug Administration based on its toxicity and how much should remain when used as directed on a particular crop.
“With apples,” says Cox, “we check for many pesticides with very small tolerances; using DDT as an example, the tolerance allows any amount up to 7 parts per million. By law, this is the maximum that will be tolerated on apples. However, we find very
92.2%