This method is for the determination of N-methylcarbamoyloximes and N-methylcarbamates in finished drinking waters. The collected sample is filtered and an aliquot up to 100uL is injected into a high performance liquid chromatograph (HPLC) equipped with a reversed phase (C18) column. After the analytes elute from the column, the analytes are hydrolyzed in a postcolumn reaction with 0.075 N sodium hydroxide (NaOH) at 80 to 100°C to form methyl amine. Methyl amine is reacted with o-phthalaldehyde (OPA) and 2-mercaptoethanol (or N,N-dimethyl-2-mercaptoethylamine) to form a highly fluorescent isoindole which is detected by a fluorescence detector.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 28 days from collection to analysis to analysis if samples are properly preserved. |
| Preservatives: | Sample should not exceed 10°C after the first 48 hours after collection. Store samples at 6°C. Protect from sample from light. Add potassium dihydrogen citrate to yield a concentration in the sample of 9.2 to 9.5 g/L. Add sodium thiosulfate to yield a sample concentration in the range of 80 to 320 mg/L. |
| Required Preps: | 40 or 60mL Amber glass bottle with Teflon-lined lid |
| Collection Method: | Grab sampling |
| Analytical Methodology: | HPLC with fluorescence detection |
| Documentation: | 
531.2
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Propoxur (Baygon) | C11H15NO3 |
114-26-1 |
0.5 |
µg/L |
| Aldicarb (Temic) | C7H14N2O2S |
116-06-3 |
0.5 |
µg/L |
| Carbofuran | C12H15NO3 |
1563-66-2 |
0.5 |
µg/L |
| Aldicarb Sulfoxide | C7H14N2O3S |
1646-87-3 |
0.5 |
µg/L |
| Aldicarb sulfone | C7H14N2O4S |
1646-88-4 |
0.5 |
µg/L |
| 3-Hydroxycarbofuran | C12H15NO4 |
16655-82-6 |
0.5 |
µg/L |
| Methomyl (Lannate) | C6H12N2O3S |
16752-77-5 |
0.5 |
µg/L |
| Methiocarb (Mesurol) | C11H15NO2S |
2032-65-7 |
0.5 |
µg/L |
| Oxamyl (Vydate) | C7H13N3O3S |
23135-22-0 |
0.5 |
µg/L |
| Carbaryl (Sevin) | C12H11NO2 |
63-25-2 |
0.5 |
µg/L |
| 1-Naphthol | C10H8O |
90-15-3 |
0.5 |
µg/L |
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.