Active Standard ASTM D7678 | Developed by Subcommittee: D19.06
Book of Standards Volume: 11.02
Significance and Use
The presence and concentration of total petroleum hydrocarbons, as well as oil and grease, in domestic and industrial wastewater is of concern to the public because of its deleterious aesthetic effect and its impact on aquatic life.
Regulations and standards have been established that require monitoring of total petroleum hydrocarbons as well as oil and grease in water and wastewater.
1.1 This test method covers the determination of total petroleum hydrocarbons (TPH) in water, and waste water, that are extractable from an acidified sample with a cyclic aliphatic hydrocarbon (for example cyclohexane), and measured by IR absorption in the region of 1370 -1380 cm-1 (7.25 -7.30 microns). Polar substances are removed by clean-up with Florisil.
1.2 The method also considers the volatile fraction of petroleum hydrocarbons which is lost by gravimetric methods that require solvent evaporation prior to weighing, as well as by solventless IR methods that require drying of the employed solid phase material prior to measurement. Similarly, a more complete fraction of extracted petroleum hydrocarbon is accessible by this method as compared to GC methods that use a time window for quantification, as petroleum hydrocarbons eluting outside these windows are also quantified.
1.3 This method defines oil and grease in water and wastewater as that which is extractable in the test method and measured by IR absorption in the region of 1370-1380 cm-1
(7.25 – 7.30 microns).
1.4 This method covers the range of 0.5 to 1000 mg/L and may be extended to a lower or higher level by extraction of a larger or smaller sample volume collected separately.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.6 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1129 Terminology Relating to Water
D1141 Practice for the Preparation of Substitute Ocean Water
D1192 Guide for Equipment for Sampling Water and Steam in Closed Conduits
D1193 Specification for Reagent Water
D2777 Practice for Determination of Precision and Bias of Applicable Test Methods of Committee D19 on Water
D3370 Practices for Sampling Water from Closed Conduits
D3921 Test Method for Oil and Grease and Petroleum Hydrocarbons in Water
D5847 Practice for Writing Quality Control Specifications for Standard Test Methods for Water Analysis
D7575 Test Method for Solvent-Free Membrane Recoverable Oil and Grease by Infrared Determination
E168 Practices for General Techniques of Infrared Quantitative Analysis
ISO StandardsISO9377-2 Determination of Hydrocarbon Oil Index
ICS Number Code 13.060.50 (Examination of water for chemical substances)