14. Precision and Bias
14.1 Precision - The precision of this test as determined by the statistical examination of interlaboratory test results is as follows:
14.1.1 Repeatability - The difference between successive results obtained by the same operator with the same apparatus under constant operating conditions 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 (see table in 14.1.2):
repeatability = 0.15 X
where:
X = the average of two results in mg/kg.
14.1.2 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, exceed the following values only in one case in twenty (see table below):
reproducibility = 1.0 X
where:
X = the average of two results in mg/kg.
14.2 Bias - Since there is no acceptable reference material suitable for determining the bias for the procedure in this test method (D5303) for measuring carbonyl sulfide, bias has not been determined.
15. Keywords
15.1 carbonyl sulfide; flame photometric detector; gas chromatography; propylene