| Sample matrix | Sample preparationa | Assay procedurea | Limit of detection | Reference |
|---|---|---|---|---|
| Water | Filter; inject into reversed-phase HPLC column; separate analytes using gradient elution chroma- tography; hydrolyse with 0.05 N NaOH; react with ortho-phthal- aldehyde and 2-mercaptoethanol | HPLC/FL | 1.0 µg/l (2.0)b | US Environmental Protection Agency (1989a) |
| Drinking-water | Adsorb on Amberlite XAD-2 resin; elute with acetone | HPLC/UV | 1µg/l | Narang & Eadon (1982) |
| Crops, animal tissue | Extract with acetone/water (3:1); add peracetic acid to oxidize residues to sulfone; clean-up on activated Florisil column | GC/FPDc | 0.01–0.05 ppm (mg/kg) | US Food and Drug Administration (1989a) |
| Milk | Precipitate solids with phosphoric acid and filter; add peracetic acid to oxidize residues to sulfone; extract into chloroform; clean-up on activated Florisil column | GC/FPDc | 0.001 ppm (mg/l) | US Food and Drug Administration (1989a) |
| Cotton-seed | Grind sample; extract and oxidize with acetonitrile/peracetic acid solution; clean-up on activated Florisil column | GC/FPDc | 0.02 ppm (mg/kg) | US Food and Drug Administration (1989a) |
| Grapes, potatoes | Extract with methanol; clean-up by liquid-liquid partitioning and column chromatography | LC/FL | Not reported | Association of Official Analytical Chemists (1985) |
| Formulations | Extract and dilute with dichloro- methane; measure absorbance at 5.75 µm and compare with standard | IR | Not reported | Romine (1974); Williams (1984) |
Abbreviations: GC/FPD, gas chromatography/flame photometric detection; HPLC/FL, high-performance liquid chromatography/fluorescence detection; HPLC/UV, high-performance liquid chromatography/ultraviolet detection; IR, infrared spectroscopy; LC/FL, liquid chromatography/fluorimetric detection
Estimated limit of detection for aldicarb sulfone and aldicarb sulfoxide
Total residues of aldicarb and its carbamate metabolites are determined as aldicarb sulfone
From: Aldicarb
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