This method is for the determinations of certain N-methylcarbamoyloximes and N-methylcarbamates in ground water and finished drinking water. The water sample is filtered and a 400 µL aliquot is injected into a reverse phase HPLC column. The analytes are separated using gradient elution chromatography. After elution from the HPLC column, the analytes are hydrolyzed with 0.05 N sodium hydroxide (NaOH) at 95°C. The methyl amine formed during hydrolysis is reacted with o-phthalaldehyde (OPA) and 2-mercaptoethanol to form a highly fluorescent derivative 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: | Samples must be preserved at pH ≤ 3. Add 1.8 mL of monochloroacetic acid buffer per 60mL prior to collection. Add 80 mg of sodium thiosulfate/L prior to collection if residual chlorine is present. Samples must be iced or refrigerated at 4°C from the time of collection to analysis. |
| Required Preps: | 60mL Amber glass bottle with Teflon-lined cap. |
| Collection Method: | Grab sampling |
| Analytical Methodology: | HPLC with fluorescence detection |
| Documentation: | 
531.1
|
| 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 |
* 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.