Measurement uncertainty in the pH measuring procedure

摘要

A measured value without even only an approximate knowledge of the uncertainty is worthless. The specification of the uncertainty is part of every measured value and every analytical procedure. The uncertainty makes the value independent of its origin. The basis for the estimation of the uncertainty is the "Guide to the expression of Uncertainty in Measurement". However, for some procedures such as the pH measurement procedure, a number of problems arise in practice. This article describes a practical and low-cost way of calculating the uncertainty of pH values.