Intercalibration 9004. pH and alkalinity (ICP Waters report)
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- NIVA-rapport 
Eleven laboratories in ten countries participated in intercalibration 9004, especially designed for testing of pH and alkalinity determination. The estimate of a total error of +/- 0.2 pH units seems to be a reasonable assessment of the accuracy of routine determination of pH. Measurement without stirring the solution is recommended. Regarding the determination of alkalinity, the Gran plot titration method is strongly recommended.
Convention on long-range transboundary air pollution
UtgiverNorsk institutt for vannforskning
ICP Waters report