ASTM WK63902

    Revision of D5185 - 18 Standard Test Method for Multielement Determination of Used and Unused Lubricating Oils and Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)

    (What is a Work Item?)

    Active Standard: D5185 - 18

    Developed by Subcommittee: D02.03 | Committee D02 | Contact Staff Manager



    WK63902

    1. Rationale

    The current requirements for check standard recovery defined in statements 11.2 and 15.2 are stated to be +/- 5% of the expected concentration for all elements. This requirement was listed in the original round robin instruction (RR D02-1282, 1991) from which the current precision is defined. Results obtained from this round robin indicate a much wider expected variability for several of the elements including Cu, Pb, P, K, Mg, Mo. This was further echoed when reviewing results obtained for only the 3 NIST reference samples that were part of the study. In many cases over half of the obtained results for individual elements found in the NIST materials would not meet the +/- 5% requirement. Recommend modifying the requirements for check standard recovery to be in alignment with defined precision stemming from the round robin or 95% - 105% recovery whichever is greater.


    Keywords

    additive-elements; aluminum; barium; boron; calcium; chromium; copper; emission-spectrometry; ICP; inductively coupled plasma atomic emission spectrometry; iron; lead; lubricating oils; magnesium; manganese; molybdenum; nickel; phosphorous, potassium; silicon; silver; sodium; sulfur; tin; titanium; vanadium; wear metals; zinc;;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    06-12-2018

    Technical Contact:
    Shawn Dubecky

    Status:
    Draft Under Development