This method is for the determination of N-methylcarbamates from soil, solid, and waste matrices by using high performance liquid chromatography (HPLC).
The soil, soild or waste sample is extracted with acetonitrile and solvent exchanged to methanol/ethylene glycol. The extract is passed through a C-18 cartridge for cleanup, filtered, and then eluted on a C-18 analytical column for separation. After separation, the analytes are hydrolyzed and derivitized post column and quantitated with a flourescence detector.
Per the method, no confirmation analysis is needed due to the specificity of the analysis.
N-methylcarbamates are sensistive to alkaline hydrolysis so store the sample out of direct sunlight.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 7 days from collection to extraction; 40 days from extraction to analysis |
| Preservatives: | Store at 4°C in the dark |
| Required Preps: | None |
| Collection Method: | Grab sampling, SW-846 Chapter 9 |
| Analytical Methodology: | HPLC with fluorescence detector |
| Documentation: | 
8318A
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Propoxur (Baygon) | C11H15NO3 |
114-26-1 |
17 |
µg/kg |
| Aldicarb (Temic) | C7H14N2O2S |
116-06-3 |
12 |
µg/kg |
| Carbofuran | C12H15NO3 |
1563-66-2 |
22 |
µg/kg |
| Aldicarb sulfone | C7H14N2O4S |
1646-88-4 |
44 |
µg/kg |
| 3-Hydroxycarbofuran | C12H15NO4 |
16655-82-6 |
10 |
µg/kg |
| Methomyl (Lannate) | C6H12N2O3S |
16752-77-5 |
12 |
µg/kg |
| Methiocarb (Mesurol) | C11H15NO2S |
2032-65-7 |
32 |
µg/kg |
| Promecarb | C12H17NO2 |
2631-37-0 |
17 |
µg/kg |
| Carbaryl (Sevin) | C12H11NO2 |
63-25-2 |
31 |
µg/kg |
| Dioxacarb | C11H13NO4 |
6988-21-2 |
50 |
µg/kg |
* 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.