ASTM D3635 Standard Test Method for Dissolved Copper In Electrical Insulating Oil By Atomic Absorption Spectrophotometry
ASTM D3635用原子吸收分光光度法測定電絕緣油中溶解的銅含量的標準試驗方法
Electrical insulating oil may contain small amounts of dissolved metals derived either directly from the base oil or from contact with metals during refining or service. When copper is present, it acts as a catalyst in promoting oxidation of the oil. This test method is useful for research for new oils and to assess the condition of service-aged oils. Consideration should be given to the limits of detection outlined in the scope.
1. Scope
1.1 This test method covers the determination of copper in new or used electrical insulating oil of petroleum origin by atomic absorption spectrophotometry.
1.2 The lowest limit of detectability is primarily dependent upon the method of atomization, but also upon the energy source, the fuel and oxidant, and the degree of electrical expansion of the output signal. The lowest detectable concentration is usually considered to be equal to twice the maximum variation of the background. For flame atomization, the lower limit of detectability is generally in the order of 0.1 ppm or 0.1 mg/kg. For non-flame atomization, the lower limit of detectability is less than 0.01 ppm.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. See for specific precautionary statements.
2. Referenced Documents (purchase separately)
ASTM Standards
D1193 Specification for Reagent Water
D3487 Specification for Mineral Insulating Oil Used in Electric Apparatus
D5222 Specification for High Fire-Point Mineral Electrical Insulating Oils
D3487 Specification for Mineral Insulating Oil Used in Electric Apparatus
D5222 Specification for High Fire-Point Mineral Electrical Insulating Oils
Index Terms
atomic absorption; copper; electrical insulating; oil; spectroscopy;
