EPA Method 1659

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EPA Method 1659:
The Determination of Dazomet in Municipal and Industrial Wastewater

Summary:
A 50-mL sample is adjusted to pH 10 to 12 and allowed to stand for 3 hours to hydrolyze dazomet to MITC. After hydrolysis, the sample is saturated with salt and extracted with 2.5 mL of ethyl acetate. Gas chromatographic conditions are described that permit the separation and measurement of MITC in the extract by wide-bore, fused-silica capillary column with nitrogen-phosphorus detector (GC/NPD).

Scope:
This method covers the determination of dazomet (CAS 533-74-4) by base hydrolysis to methyl isothiocyanate (MITC; CAS 556-61-6) and subsequent determination of MITC by wide bore, fused-silica column gas chromatography (GC) with a nitrogen-phosphorus detector (NPD).

Report Number:
821/R-93-010-A