MIL-DTL-85694A
4.4.1 Rotrode qualification testing. Testing of spectrometric oil standards shall be done as a
statistical analysis and performed on the data generated by the spectrometric analysis to provide
an accuracy index (AI) and repeatability index (RI) for each element involved.
4.4.1.1 Test method. The qualification testing of spectrometric oil standards shall consist of
ten replicates of each standard. The results shall be obtained with a Spectroil M/N spectrometer
or equivalent direct reading, rotating disk electrode, atomic emission spectrometer approved by
the Joint Oil Analysis Program-Coordinating Group (JOAP-CG).
4.4.1.1.1 Accuracy index (AI). The accuracy index (AI) of spectrometric oil standards shall
meet the requirements specified in Table IV for the appropriate ppm concentration level. If the
spectrometric oil standard does not meet the specified accuracy index then the spectrometric oil
standard shall be rejected.
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The accuracy index is as follows:
Where Y = nominal value of the SOS in ppm
= average measured value of the SOS in ppm
4.4.1.1.2 Repeatability index (RI). The repeatability index (RI) of the spectrometric oil
standards shall meet the requirements specified in Table IV for the appropriate ppm
concentration level. If the results are not satisfactory for the spectrometric oil standards, then
the spectrometric oil standard shall be rejected.
1
∑
The repeatability index is as follows:
∑
= individual analysis result
Where N = number of replicates = 10
Σ = summation of the analytical data
4.4.2 ICP qualification testing. Testing of spectrometric oil standards shall be done as a
statistical analysis and performed on the data generated by the spectrometric analysis to provide
an accuracy index (AI) for each element involved.
4.4.2.1 Test method. The qualification testing of spectrometric oil standards shall consist of
five replicates of each standard. Spectrometric oil standards shall be diluted on a weight-by-
weight basis with a suitable ICP solvent. Typically, spectrometric oil standards in concentrations
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