ASTM D7678-17 (2022) PDF

Full title and description

Standard Test Method for Total Oil and Grease (TOG) and Total Petroleum Hydrocarbons (TPH) in Water and Wastewater with Solvent Extraction using Mid-IR Laser Spectroscopy. This ASTM test method defines procedures for extracting oil/grease and petroleum hydrocarbon fractions from acidified aqueous samples using a cyclic aliphatic solvent and quantifying them by mid‑infrared laser/IR absorption measurement.

Abstract

This method describes solvent extraction of an acidified water or wastewater sample (commonly using cyclohexane or similar cyclic aliphatic hydrocarbon), optional clean‑up of polar materials with Florisil, and measurement of TOG and TPH by infrared absorption in the 1370–1380 cm⁻¹ region using a mid‑IR laser or non‑dispersive mid‑IR transmission spectrometer. The method reports typical working ranges from sub‑mg/L to about 1000 mg/L and explicitly addresses volatile fractions that can be lost by other gravimetric or solventless techniques.

General information

• Status: Current ASTM standard (revised edition approved 2022).
• Publication date: Approved / published October 15, 2022 (document designation shown as D7678‑17 with 2022 revision).
• Publisher: ASTM International.
• ICS / categories: Examination of water for chemical substances; ICS code commonly associated with water chemical analysis (example: 13.060.50).
• Edition / version: Designation D7678‑17 (with 2022 revision/publication often shown as D7678‑17(2022) or D7678‑17R22).
• Number of pages: Approximately 10 pages (typical published PDF length).

Scope

The standard covers determination of TOG and TPH in water and wastewater that are extractable from an acidified sample with a cyclic aliphatic solvent (for example cyclohexane), with quantification by IR absorption in the 1370–1380 cm⁻¹ region. It includes treatment to remove polar substances (Florisil cleanup) to isolate the hydrocarbon fraction for TPH reporting, and accommodates a working concentration range typically from about 0.1–0.5 mg/L up to ~1000 mg/L (extendable by changing sample/solvent volumes). The method also notes its advantage in measuring volatile fractions that some gravimetric or solventless IR approaches may lose.

Key topics and requirements

• Sample acidification prior to liquid–liquid extraction.
• Solvent extraction with a cyclic aliphatic hydrocarbon (commonly cyclohexane) and control of extraction volumes to set reporting range.
• Optional Florisil clean‑up step to remove polar material when reporting TPH (nonpolar fraction) separately from TOG (total extractable material).
• Measurement by mid‑IR laser or non‑dispersive mid‑IR transmission spectroscopy targeting the 1370–1380 cm⁻¹ absorption band.
• Calibration and quality control procedures consistent with ASTM/committee D19 expectations; interlaboratory precision established in supporting research reports.
• Reporting limits, linear range, and method detection limits depend on sample and solvent volumes; method provides guidance for extending lower or upper limits by varying volumes.
• Safety, solvent handling (flammability, VOC control), and waste disposal requirements for organic solvents are implicit and must be followed by users.

Typical use and users

Used by environmental testing laboratories, wastewater treatment facilities, industrial process monitoring teams, environmental consultants, and regulators for routine monitoring, compliance testing, and process control where measurement of oil and grease or petroleum hydrocarbons in aqueous effluents or environmental waters is required. The method is particularly useful when rapid IR‑based screening or when measurement of volatile fractions (lost in some gravimetric methods) is important.

Related standards

Commonly referenced and correlated methods include: EPA Method 1664A / 1664B (n‑hexane extractable material — gravimetric oil & grease / SGT‑HEM for TPH), ASTM D7575 (solvent‑free membrane IR oil & grease), ASTM D7066 (S‑316 IR determination), ASTM D3921 and ASTM D8193 (other IR‑based oil/TPH procedures), and ISO/EN methods for TPH (for example ISO 9377‑2). These methods represent alternative extraction/detection approaches (gravimetry, membrane IR, dispersive/non‑dispersive IR, GC speciation) and are often cited for regulatory comparison or method selection.

Keywords

TOG, TPH, oil and grease, mid‑IR laser spectroscopy, cyclohexane extraction, Florisil cleanup, water analysis, wastewater monitoring, ASTM D7678, infrared absorption 1370–1380 cm⁻¹.

FAQ

Q: What is this standard?

A: ASTM D7678 is a test method for measuring total oil and grease (TOG) and total petroleum hydrocarbons (TPH) in water and wastewater by solvent extraction followed by mid‑IR laser/IR spectroscopy.

Q: What does it cover?

A: It specifies sample acidification, extraction with a cyclic aliphatic solvent (e.g., cyclohexane), optional Florisil cleanup to isolate nonpolar hydrocarbons, and IR measurement in the 1370–1380 cm⁻¹ region; working range is typically from sub‑mg/L up to ~1000 mg/L (extendable by sample/solvent volume changes).

Q: Who typically uses it?

A: Environmental and commercial analytical laboratories, wastewater treatment plants, industrial environmental monitoring teams, consultants, and regulators who need TOG/TPH data for compliance, process control, spill response, or monitoring.

Q: Is it current or superseded?

A: The D7678 method was revised from the original 2011 edition; a D7678‑17 revision is recorded and a 2022 revision/approval is published (document references commonly show D7678‑17 with a 2022 publication/approval). Users should confirm the exact designation and approval date with ASTM before purchase or citation to ensure they reference the latest available text.

Q: Is it part of a series?

A: Yes — it is maintained under ASTM Committee D19 (Methods for Analysis of Water) and Subcommittee D19.06; it sits among other IR‑ and extraction‑based oil/grease/TPH methods (for example D8193, D7575, D7066, D3921) and is often compared or correlated with EPA Method 1664A/1664B and ISO methods.

Q: What are the key keywords?

A: TOG, TPH, oil and grease, cyclohexane extraction, mid‑IR, laser spectroscopy, Florisil cleanup, water, wastewater, ASTM D7678.