Work Item
ASTM WK74312

New Test Method for Bioavailable Aluminum in Water with Suspended Solids

1. Scope

The study of water, the promotion of knowledge thereof, and the standardization of terminology methods for:
* Sampling and analysis of water, waterborne materials, and wastes, water- formed deposits and fluvial sediments,
* Surface-water hydraulics and hydrologic measurements,
* The determination of the performance of materials or products used to modify water characteristics, and
* The determination of the corrosivity or deposit forming properties of water.
The term "water" includes, but is not limited to, surface waters (rivers, lakes, artificial impoundments, runoff, etc.), groundwaters and springwaters, wastewaters (mine drainage, landfill leachate, brines, waters resulting from atmospheric precipitation and condensation (with the exception of acid deposition), process waters, potable waters, glacial melt waters, steam, water for subsurface injection and water discharges including waterborne materials and water-formed deposits.
The work of the Committee will be coordinated with other ASTM Committees and other societies and organizations having mutual interests.

Keywords

environmental; toxicity; water quality; EPA

Rationale

The USEPA has established water quality criteria for aluminum. Many US States have adopted these criteria and require dischargers to meet water quality standards placed in their discharge permit. No direct relationship between dissolved Al and toxicity was shown for a wide variety of aquatic organisms in chronic toxicity studies. Toxicity does, however, correlate with aluminum measurements obtain using the pH 4 extraction method. Natural water and wastewater frequently contain significant levels of suspended solids (25-300 mg/L) containing minerals high in aluminum. Regulatory authorities often recommend measurement of total recoverable aluminum which uses a strong acid digestion. This digestion procedure results in most or all of the inert non-toxic Al present in suspended solids being dissolved and the metal reported as total or total recoverable. This new method (pH 4 extraction) measures aqueous bioavailable aluminum not associated with suspended solids providing a closer approximation of toxic aluminum concentration.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: D19.05

Committee: D19

Staff Manager: Brian Milewski

Work Item Status

Date Initiated: 10-07-2020

Technical Contact: William Adams

Item: 001

Ballot: D19.05 (21-01)

Status: Will Reballot Item