Fertilizers mineral

5.8.2 Control using standard samples Standard samples of approved
types, similar in composition to the analyzed mineral fertilizer, are used as control means. Error control using standard
samples consists in comparing the certified value C,%, with the result of
measuring IKTG by the method I/,%, established by this standard.
GOST 8.613-2012
5.8.3 Stability control 5.8.3.1
Measurement results obtained from error control can be applied to
(YU)
(9)
If condition (6) is not met, measurements are repeated using another sample. If condition (6) is not met again, the
reasons that led to unsatisfactory results are clarified,
1, %;
and is considered satisfactory if
The discrepancy between the results of parallel determinations:
Note - The most common reason for exceeding the error when measuring the mass fraction of moisture by the IR TG
method is incorrectly selected parameters of the measurement mode with a moisture meter of a particular type and non-compliance
with the sample preparation procedure.
(8)
B < A.
11 See also [5].
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Measurement range, %
Repeatability index (relative standard
deviation of repeatability) a0r
4
25
0.01 to 12
Accuracy index (limits within which the
relative measurement error with ÿ =
0.95 is located) ± 60
1.96
1) See [5].
7
Note - It is allowed to calculate the standard deviation of the error based on the results of previous periods to determine the
parameters of the control chart. In this case, the standard deviation of the error in the implementation of this method in a particular
laboratory should be less than the value obtained by formula (13).
Table 2 - Values of indicators of accuracy and repeatability in the implementation of the method of IR spectroscopy In percent