Product Notes

Limitations of Test

Colored or turbid samples may obscure color change at the end point.  A pH meter may be used as an indicator in these situations with titration to pH 4.3.  The pH meter should be calibrated prior to use by an appropriate standard buffer. Free available chlorine in the sample may bleach the indicator.  This source of interference may be eliminated by treating the sample with one drop of 0.1N sodium thiosulfate.