Carbaryl Residues in Citrus Fruits (Kinnow mandarin) and Soil

Persistence of carbaryl residues on citrus fruits (kinnow mandarin) is reported employing an analytical methodology based on solid phase extraction and detection by High Performance Liquid Chromatography (HPLC) equipped with Photo Diode Array detector. Application of carbaryl (Sevin 50 WDP) at 0.2 (recommended) and 0.4% (double the recommended concentration), resulted in initial deposits of 7.54 and 11.80 mg kg⁻¹ respectively on the fruits. The residues declined slowly over time with respective half-life values in fruits of 13.15 and 16.00 days. The residues dissipated to below determination level on 40^th day. In soil, residues detected on 10^th day were 3.70 and 6.21 mg kg⁻¹ respectively at the two concentrations. At double the standard spray concentration the residues in soil were below determination limit on the 40^th day.