Method NCASI RSC-02.02

Reduced Sulfur Compounds by Direct Injection GC/FPD


This method is for the determination of reduced sulfur compounds in wastewaters from pulp and paper mills.  The reduced sulfur compounds mentioned in the method are listed below. 

An aliquot of the samples if acidified and injected into the GC with a split injection.

A separate sample must be collected for total sulfide analysis because it is preserved differently than the other reduced sulfur compounds.


(NCASI)

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Method Data

Hold Times, Preservatives, Preps, Collection, Analytical & Documentation
Holding Time:   14 days from sample collection to analysis if properly preserved.
Preservatives:   Add 5mL of zinc acetate to a 40mL VOA vial for total sulfide analysis. pH of the sample should be >10. Adjust with 1N NaOH if necessary. Add 120mg of ascorbic acid to a 40mL VOA vial and adjust pH to <2.5 with phosphoric acid for other reduced sulfurs. Keep samples at 4°Cf from sample collection to analysis.
Required Preps:   40mL Amber VOA vial with Teflon-lined lid
Collection Method:   Grab sampling
Analytical Methodology:   GC/FPD
Documentation:   RSC-02.02

Analyte List*

Analyte Formula CAS Number Detection Limit
Sulfide
S(-2)
18496-25-8
32
 µg/L
Dimthyl trisulfide
C2H6S3
3658-80-8
20
 µg/L
Dimethyl disulfide
C2H6S2
624-92-0
20
 µg/L
Methyl mercaptan
CH4S
74-93-1
20
 µg/L
Dimethyl sulfide
C2H6S
75-18-3
20
 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.