MIL-DTL-85694A
5 ppm, 10 ppm, 30 ppm, and 50 ppm shall be diluted tenfold. Spectrometric oil standards in
concentrations 80 ppm, 100 ppm, 120 ppm, 300 ppm, 500 ppm, 700 ppm, and 900 ppm shall be
diluted to an appropriate concentration for the given calibration curve. The results shall be
obtained with an inductively coupled plasma optical emission spectrometer approved by the Joint
Oil Analysis Program-Coordinating Group (JOAP-CG).
4.4.2.1.1 Accuracy index (AI). The accuracy index (AI) of spectrometric oil standards shall
meet the requirements specified in Table V 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 = formulation concentration of the SOS in ppm (see Table II)
= average measured value of the SOS in ppm
4.4.3 Extended storage stability test. Two 8 ounce samples for each type of spectrometric
oil standards shall be stored at room temperature maintained at 25 ±5 °C for the following
periods. Type D19-0: 30 months, Type D12-XXX: 30 months, Type D19-XXX: 12 months,
Type D3-100: 12 months, and Type D21-XXX: 12 months. At the midpoint and end of these
storage periods, the respective sample shall be examined for conformance to the requirements
specified in Table III.
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