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MODIFICATION OF METHODS 9030 AND 9031 FOR THE ANALYSIS OF SULFIDE BY SPECIFIC ION ELECTRODE
Citation:
Hillman, D. AND P. Nowinski. MODIFICATION OF METHODS 9030 AND 9031 FOR THE ANALYSIS OF SULFIDE BY SPECIFIC ION ELECTRODE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/4-90/024 (NTIS PB90274135), 1990.
Description:
Two OSW SW-846 methods (Method 9030 and 9031) used for the determination of sulfide have been modified to include the use of sulfide specific ion electrodes (SIE). urrently in both methods sulfide is converted to hydrogen sulfide and distilled into a scrubber solution for subsequent determination by iodometric titration. n the modified methods, the hydrogen sulfide in the scrubber is determined by sulfide SIE. ingle lab evaluation was performed to determine the operating characteristics. he sulfide SIE is linear over the range 0.25-6000 mg/L sulfide with a detection limit is about 0.2 mg/L sulfide. ver the range 5-6000 mg/L, the relative precision of the SIE is 2-4 percent. he accuracy (expressed as percent recovery) over the range 0.25-6000 mg/L varies from 75-103 percent. he sulfide SlE is very selective for the sulfide dianion and in the scrubber solution, there are no interferences. ecoveries in real samples spiked with 17.5 mg/L sulfide varied from 68-77 percent before distillation and 93-98 percent after distillation. he results from the evaluation indicate that the sulfide SIE provides an alternate technique to determine sulfide in environmental samples after distillation.
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MODIFICATION OF METHODS 9030 AND 9031 FOR THE ANALYSIS OF SULFIDE BY SPECIFIC ION ELECTRODE