Norm

ASTM D7303-12

Standard Test Method for Determination of Metals in Lubricating Greases by Inductively Coupled Plasma Atomic Emission Spectrometry

54,27

Over deze norm

Status Definitief
Aantal pagina's 7
Commissie D02.03
Gepubliceerd op 01-06-2012
Taal Engels

1.1 This test method covers the determination of a number of metals such as aluminum, antimony, barium, calcium, iron, lithium, magnesium, molybdenum, phosphorus, silicon, sodium, sulfur, and zinc in unused lubricating greases by inductively coupled plasma atomic emission spectrometry (ICP-AES) technique.

1.1.1 The range of applicability for this test method, based on the interlaboratory study conducted in 2005, is aluminum (10600), antimony (102300), barium (50800), calcium (2050 000), iron (10360), lithium (3003200), magnesium (3010 000), molybdenum (5022 000), phosphorus (502000), silicon (1015 000), sodium (301500), sulfur (160028 000), and zinc (3002200), all in mg/kg. Lower levels of elements may be determined by using larger sample weights, and higher levels of elements may be determined by using smaller amounts of sample or by using a larger dilution factor after sample dissolution. However, the test precision in such cases has not been determined, and may be different than the ones given in Table 1.

1.1.2 It may also be possible to determine additional metals such as bismuth, boron, cadmium, chromium, copper, lead, manganese, potassium, titanium, etc. by this technique. However, not enough data is available to specify the precision for these latter determinations. These metals may originate into greases through contamination or as additive elements.

1.1.3 During sample preparation, the grease samples are decomposed with a variety of acid mixture(s). It is beyond the scope of this test method to specify appropriate acid mixtures for all possible combination of metals present in the sample. But if the ash dissolution results in any visible insoluble material, the test method may not be applicable for the type of grease being analyzed, assuming the insoluble material contains some of the analytes of interest.

1.2 Elements present at concentrations above the upper limit of the calibration curves can be determined with additional appropriate dilutions of dissolved samples and with no degradation of precision.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in Sections 8 and 10.

TABLE 1 Precision of Grease Analysis

Note—X is the mean concentration in mg/kg.

ElementRange,
mg/kg
RepeatabilityReproducibility
Aluminum106000.2163 X0.96.8156 X0.9
Antimony1023000.3051 X0.81914.6809 X0.8191
Barium508000.3165 X0.75282.9503 X0.7528
Calcium2050 0002.2853 X0.70673.0571 X0.7067
Iron103600.8808 X0.74752.5737 X0.7475
Lithium30032000.0720 X1.03520.1476 X1.0352
Magnesium3010 0000.6620 X0.68132.6155 X0.6813
Molybdenum5022 0000.1731 X0.94740.4717 X0.9474
Phosphorus5020001.2465 X0.67404.0758 X0.6740
Silicon1015 0001.3859 X0.99354.8099 X0.9935
Sodium3015006.5760 X0.511.571 X0.5
Sulfur160028 0001.0507 X0.85881.5743 X0.8588
Zinc30022000.1904 X0.86070.5912 X0.8607

Details

ICS-code 75.100
Nederlandse titel Standard Test Method for Determination of Metals in Lubricating Greases by Inductively Coupled Plasma Atomic Emission Spectrometry
Engelse titel Standard Test Method for Determination of Metals in Lubricating Greases by Inductively Coupled Plasma Atomic Emission Spectrometry

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