The ion-selective electrode method is an EPA-approved test procedure to directly read sulfide in waste water.  Laboratory productivity is improved with quick, uncomplicated determinations.  Use of the SAOB frees sulfur from hydrogen ion (by buffering at a pH above 12), prevents oxidation of sulfide, ensures that samples and standards have similar ionic strength and reduces the effect of interfering ions.  This procedure conforms to EPA-approved test procedures from Standard Methods and ASTM.

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