15.1.2 Reproducibility-The difference between two single and independent results obtained by different operators working in different laboratories on identical test material would in the long run in the normal and correct operation of the test method exceed the following values only in one case in twenty.
15.1.2.1 Existent inorganic sulfate- Reproducibility R between 1.0 and 20 mg/kg existent inorganic sulfate measured is calculated as follows
15.2 Bias-Since there was no generally accepted reference material available at the time of the interlaboratory testing no statement of bias can be made at this time.
15.3 Table 2 shows precision values calculated from Eq7 and Eq8