ASTM D4744-89 (1995)e1 PDF

Full title and description

St ASTM D4744-89 (1995)e1 — Standard Test Method for Organic Halides in Water by Carbon Adsorption–Microcoulometric Detection. Designation D 4744 – 89 (Reapproved 1995, editorial e1). The method specifies adsorption of organic halides onto granular activated carbon (GAC), followed by desorption and measurement by microcoulometric detection to quantify total organic halides in water samples.

Abstract

This test method provides a laboratory procedure to determine organic halide concentrations in aqueous samples in the approximate range 5–1000 µg/L (with dilution for higher concentrations). It applies only to organic halides that are adsorbable on granular activated carbon and includes limits and precautions for inorganic halide interferences. The standard was reapproved in 1995 with an editorial change (e1) and has since been withdrawn.

General information

• Status: Withdrawn (withdrawal reported in 2002).
• Publication date: Original designation D 4744 – 89; reapproved/issued in the 1995 reapproval (document commonly dated 1995).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: Water quality / Water analysis; developed under ASTM Committee D19 (Subcommittee D19.06—methods for analysis of organic substances in water).
• Edition / version: D4744-89 (Reapproved 1995) e1 (editorial change).
• Number of pages: 6 pages (concise test method document).

Scope

The method covers determination of organic halides in water samples having concentrations between about 5 and 1000 µg/L (with dilution allowed for higher levels). It is applicable only to organic halides that are retained by granular activated carbon and is intended for matrices where inorganic halide concentrations do not exceed organic halide concentrations by more than about 20 000:1. Users are advised to verify applicability for untested sample matrices and to account for potential interferences from inorganic halides.

Key topics and requirements

• Analyte: total organic halides (TOX) — halogenated organic compounds collectively.
• Sampling and sample handling: requirements to control contamination and preserve samples prior to adsorption on GAC.
• Sample preparation: adsorption of organohalides onto granular activated carbon (GAC), followed by an accepted desorption procedure.
• Detection: microcoulometric detection of liberated halides after combustion/desorption (microcoulometry provides quantitative halide measurement).
• Calibration and quality control: calibration using appropriate standards and procedural blanks; attention to detection limits (nominal lower limit ≈ 5 µg/L).
• Interferences and limitations: inorganic halides (chloride, bromide, etc.) can interfere — method applicability limited where inorganic halide concentration greatly exceeds organic halide concentration; only compounds that adsorb to GAC are measured.
• Reporting: concentration range, detection limit, any dilutions, and matrix-specific caveats must be reported.

Typical use and users

Used historically by environmental and water-analysis laboratories, wastewater treatment facilities, regulatory monitoring agencies, and research groups for screening and quantifying total organic halides (TOX/AOX-type measurements) in surface water, groundwater, and certain industrial effluents. Instrument and accessory vendors reference the method when marketing TOX/AOX analysers based on carbon adsorption and microcoulometry.

Related standards

Related ASTM standards and practices often cited with or used alongside D4744 include Test Methods for chloride and other ions (e.g., D512), sample container and preservation practices (e.g., D3694), and other TOC/TOX/organic-halide measurement methods (see ASTM water analysis series and subcommittee D19.06 references). Users commonly consult companion methods for sample preservation, chloride determination, and alternative organic-carbon/halide procedures when selecting an analysis strategy.

Keywords

organic halides, TOX, AOX, GAC adsorption, microcoulometry, carbon adsorption, water analysis, wastewater testing, D4744, ASTM D19

FAQ

Q: What is this standard?

A: ASTM D4744-89(1995)e1 is a test method titled "Standard Test Method for Organic Halides in Water by Carbon Adsorption–Microcoulometric Detection" that specifies adsorption of organohalides onto granular activated carbon followed by microcoulometric measurement.

Q: What does it cover?

A: It covers the determination of organic halides in water in the approximate range of 5–1000 µg/L for compounds that can be adsorbed on GAC, and includes guidance on interferences (notably high inorganic halide concentrations) and procedural considerations.

Q: Who typically uses it?

A: Environmental testing laboratories, municipal and industrial wastewater labs, regulatory monitoring agencies, and instrument vendors for AOX/TOX analysis historically used this method for screening/quantifying total organic halides.

Q: Is it current or superseded?

A: This particular designation (D4744-89, reapproved 1995, e1) has been withdrawn (reported in 2002). Users should consult ASTM International or current committee D19 documents for any replacement or alternative methods before relying on it for regulatory work.

Q: Is it part of a series?

A: It is part of the ASTM water-analysis portfolio maintained by Committee D19 (Subcommittee D19.06 handles methods for organic substances in water). Related methods for sample preservation, chloride analysis, and other carbon/halide determinations are commonly used in the same testing programs.

Q: What are the key keywords?

A: Organic halides, TOX, AOX, granular activated carbon (GAC), microcoulometric detection, water analysis, adsorption, desorption.