ASTM-D7303 Standard Test Method for Determination of Metals in Lubricating Greases by Inductively Coupled Plasma Atomic Emission Spectrometry

ASTM-D7303 - 2017 EDITION - CURRENT
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Standard Test Method for Determination of Metals in Lubricating Greases by Inductively Coupled Plasma Atomic Emission Spectrometry
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Scope

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 2005,2 is aluminum (10 to 600), antimony (10 to 2300), barium (50 to 800), calcium (20 to 50 000), iron (10 to 360), lithium (300 to 3200), magnesium (30 to 10 000), molybdenum (50 to 22 000), phosphorus (50 to 2000), silicon (10 to 15 000), sodium (30 to 1500), sulfur (1600 to 28 000), and zinc (300 to 2200), 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.

TABLE 1 Precision of Grease Analysis

Note 1: X is the mean concentration in mg/kg.

Element

Range,
mg/kg

Repeatability

Reproducibility

Aluminum

10–600

0.2163 X0.9

6.8156 X0.9

Antimony

10–2300

0.3051 X0.8191

4.6809 X0.8191

Barium

50–800

0.3165 X0.7528

2.9503 X0.7528

Calcium

20–50 000

2.2853 X0.7067

3.0571 X0.7067

Iron

10–360

0.8808 X0.7475

2.5737 X0.7475

Lithium

300–3200

0.0720 X1.0352

0.1476 X1.0352

Magnesium

30–10 000

0.6620 X0.6813

2.6155 X0.6813

Molybdenum

50–22 000

0.1731 X0.9474

0.4717 X0.9474

Phosphorus

50–2000

1.2465 X0.6740

4.0758 X0.6740

Silicon

10–15 000

1.3859 X0.9935

4.8099 X0.9935

Sodium

30–1500

6.5760 X0.5

11.571 X0.5

Sulfur

1600–28 000

1.0507 X0.8588

1.5743 X0.8588

Zinc

300–2200

0.1904 X0.8607

0.5912 X0.8607

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 development of the technique behind this test method is documented by Fox.3

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

1.5 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.

1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Keywords

additive elements; aluminum; antimony; barium; calcium; emission spectrometry; grease; ICP; inductively-coupled plasma emission spectrometry; internal standard; iron; lithium; lubricating grease; magnesium; molybdenum; phosphorus; silicon; sodium; sulfur; zinc;; ICS Number Code 75.100 (Lubricants, industrial oils and related products)

To find similar documents by ASTM Volume:

05.04 (Petroleum Products and Lubricants (IV): D6973 - latest)

To find similar documents by classification:

75.100 (Lubricants, industrial oils and related products Including mineral oils, fluids for metal working and for temporary protection against corrosion Lubrication systems, see 21.260 Insulating oils, see 29.035.40)

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Document Number

ASTM-D7303-17

Revision Level

2017 EDITION

Status

Current

Modification Type

Revision

Publication Date

June 15, 2017

Document Type

Test Method

Page Count

7 pages

Committee Number

D02.03