EPA Method 9031

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EPA Method 9031:
EXTRACTABLE SULFIDES

Summary:
If the sample contains solids that will interfere with agitation and homogenization of the sample mixture, or so much oil or grease as to interfere with the formation of a homogeneous emulsion in the distillation procedure, the sample may be filtered and the solids extracted with water at pH > 9 and < 11. The extract is then combined with the filtrate and analyzed by the distillation procedure. Separation of sulfide from the sample matrix is accomplished by the addition of sulfuric acid to the sample. The sample is heated to 70EC and the hydrogen sulfide (H2S) which is formed is distilled under acidic conditions and carried by a nitrogen stream into zinc acetate gas scrubbing bottles where it is precipitated as zinc sulfide.

Scope:
The extraction procedure described in this method is designed for the extraction of sulfides from matrices that are not directly amenable to the distillation procedure Method 9030. Specifically, this method is designed for the extraction of soluble sulfides. This method is applicable to oil, solid, multiphasic, and all other matrices not amenable to analysis by Method 9030. This method is not applicable for reactive sulfide.

Report Number:
SW-846 Ch 5