Intercalibration 9105. pH, conductivity, alkalinity, nitrat + nitrite, chloride, sulfate, calcium, magnesium, sodium, potassium and total organic carbon (ICP Waters report)

Abstract

21 laboratories in 15 countries participated in intercalibration 9105. Basedon the general target accuracy of +/- 20 %, 90 - 100 % of the results were acceptable for all the main components, only 0-2 result pairs lying outside the accuracy limit. Most results are even lying within much narrower limits. For pH only 35 % of the result pairs were acceptable in relation observed for pH are caused by systematic errors.