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ASTM D7751-12
Standard Test Method for Determination of Additive Elements in Lubricating Oils by EDXRF Analysis
STANDARD published on 1.12.2012
The information about the standard:
Designation standards: ASTM D7751-12
Note: WITHDRAWN
Publication date standards: 1.12.2012
SKU: NS-39064
The number of pages: 6
Approximate weight : 18 g (0.04 lbs)
Country: American technical standard
Category: Technical standards ASTM
Annotation of standard text ASTM D7751-12 :
Keywords:
additive elements, additives, calcium, chlorine, EDXRF, energy dispersive, lubricating oil, magnesium, molybdenum, phosphorus, spectrometry, sulfur, X-ray, XRF, zinc, ICS Number Code 75.100 (Lubricants, industrial oils and related products)
Additional information
| Significance and Use | |
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5.1 Lubricating oils are formulated with organo-metallic additives, which act, for example, as detergents, antioxidants, antifoaming, or antiwear agents, or a combination thereof. Some of these additives contain one or more of the following elements: magnesium, phosphorus, sulfur, chlorine, calcium, zinc, and molybdenum. This test method provides a means of determining the concentrations of these elements, which in turn provides an indication of the additive content of these oils. 5.2 Additive packages are the concentrates that are used to blend lubricating oils. 5.3 This test method is primarily intended to be used for the monitoring of additive elements in lubricating oils. 5.4 If this test method is applied to lubricating oils with matrices significantly different from the calibration materials specified in this test method, the cautions and recommendations in Section 6 should be observed when interpreting the results. |
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| 1. Scope | |
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1.1 This test method covers the quantitative determination of additive elements in unused lubricating oils and additive packages, as shown in Table 1. The pooled limit of quantitation of this test method as obtained by statistical analysis of interlaboratory test results is 0.02% for magnesium, 0.003 % for phosphorus, 0.002 % for sulfur, 0.001 % for chlorine, 0.003 % for calcium, 0.001 % for zinc, and 0.002 % for molybdenum. Element |
Concentration Range in mass % |
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Magnesium |
0.02 to 0.4 |
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Phosphorous |
0.003 to 0.25 |
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Sulfur |
0.002 to 1.5 |
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Chlorine |
0.001 to 0.4 |
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Calcium |
0.003 to 1.0 |
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Zinc |
0.001 to 0.25 |
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Molybdenum |
0.002 to 0.05 |
1.2 Additive packages require dilution with a contamination free diluent (base oil) prior to analysis. The dilution factor has to be calculated from the expected concentrations to bring the concentrations for all elements into the ranges listed in Table 1.
1.3 Some lubrication oils will contain higher concentrations than the maximum concentrations listed in 1.4 This test method is limited to the use of energy dispersive X-ray fluorescence (EDXRF) spectrometers employing an X-ray tube for excitation in conjunction with the ability to separate the signals of adjacent elements by using a high resolution semiconductor detector.
1.5 This test method uses inter-element correction factors calculated from a fundamental parameters (FP) approach or from another matrix correction method.
1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6.1 The preferred concentration units are mg/kg or mass %.
1.7 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.
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Standard Practice for Manual Sampling of Petroleum and Petroleum Products |
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Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance (Includes all amendments and changes 12/12/2023). |
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Standard Guide for Elemental Analysis by Wavelength Dispersive X-Ray Fluorescence Spectrometry |
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Standard Practice for Optimization, Sample Handling, Calibration, and Validation of X-ray Fluorescence Spectrometry Methods for Elemental Analysis of Petroleum Products and Lubricants |
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Standard Practice for Quality Management Systems in Petroleum Products, Liquid Fuels, and Lubricants Testing Laboratories (Includes all amendments and changes 12/7/2023). |
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Standard Practice for Automatic Sampling of Petroleum and Petroleum Products (Includes all amendments and changes 3/24/2023). |
