AbstractThe herbicides bentazone, 2,4‐D, MCPA, propanil, molinate, and tiocarbazil, and the insecticide phenthoate, were applied to ricefields in Sardinia at rates equivalent to maximum aqueous concentrations of 0.4‐2.8 mg kg−1, assuming the water to be 20 cm deep. Their concentrations in water were measured by high‐performance liquid chromatography. Residues in 162 water samples, collected from 16 ricefields 1, 4, 7, 10, 12, 18, 21 and 120 days after the last spraying, were all below the limit of determination (0.03 mg kg−1). Residues in 40 water samples taken from five drainage canals were also less than 0.0
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