Residue of paraquat in noni fruits

A.M. Khairatul, C.K. Ma, N.Y. Lo and J. Jamiah

Abstract

The residue of paraquat in noni (mengkudu) fruits was investigated using spectrophotometric method. Recovery study using paraquat fortified noni fruit produced satisfactory percentage recoveries of 78.5% and 81.7% for noni spiked with 0.25 µg/g and 0.50 µg/g respectively, demonstrating that the analytical method used was effective. In the field treatment, paraquat was applied at the rate of 0.941 kg/ha on three repeated applications and two controls were designated for comparative purposes. No paraquat residue was detected in the samples collected from both control and treated plots at all sampling periods except for samples from the treated plot at 60 days after last application (DALA). At 60 DALA, a paraquat concentration of 0.14 ppm was detected.

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