British Standards Institution

Source:: ISO
Committee:: EH/3/2 - Physical chemical and biochemical methods
Categories:: Information management | Standardization. General rules
Comment period start date:: 06/05/2025
Comment period end date:: 27/06/2025

Comment by:

27th Jun

Scope

This document specifies a laboratory method for the determination of total organic carbon (TOC) in surface water, ground water, and wastewater that is oxidized and measured in manufactured and commercially available sealed-tube tests. It is applicable to both dissolved and suspended particulate organic carbon.

The method is not applicable for the determination of volatile, or purgable, organic carbon under the conditions described in this standard.

The method allows for determination of TOC 2 mg/l. The lower and upper working ranges are restricted by instrument and procedure-dependent conditions (for example sample volume, chemistry concentration, path length) and can be adjusted for a wider range (both lower and upper levels).

Purpose

The methods given in ISO 8245, ISO 20236 or EN 1484 for the measurement of total organic carbon (TOC) in water samples require costly laboratory equipment and specialists for the analysis. Therefore TOC measurements are mostly not available on mid- and small-sized water treatment facilities. An accurate but simple, efficient and low cost analytical method is desirable to enable TOC measurements also on small and mid size water treatment facilities.

TOC results are available short time. This enables plant operators to react swiftly on unexpected events. This is also in line with a trend in several EU countries to replace harmful reagents using COD test by environmental friendly TOC.

The proposed method comprises pre-packaged chemistries in test vials, digital thermal bench top reactor for the oxidation and spectrophotometer. It completes a batch of 30 samples in 2 h, and can analyze samples containing suspended solids.

Comment on proposal

Required form fields are indicated by an asterisk (*) character.

How important do you think standardization is in this area? *

Do you agree that a standard on this subject is feasible?: *

Please give reasons for your selections above: *

Would you or your organization use the standard? *

Would you or your organization be prepared to participate in the development of the standard or to comment on the draft when it is available? *

Are you aware of any regulation, existing standards and other good practice information in this area in the UK (e.g. Industry codes of practice; company specifications, international or European Standards)? *

Would the development of a standard(s) in this area have a particular impact/relevance to SME, consumer, environmental or societal interests? *

Are you aware of any other organizations to which this proposal may be relevant? If so please provide details below. *

Additional comments on the scope or proposal:

Although BSI will not usually enter into correspondence regarding individual comments or suggestions we may wish to contact you to seek further clarification. Please indicate whether this will be acceptable: *

Discard

Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

06/05/2025

Proposal end date:

27/06/2025

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

Learn more about the standards development process

Standards Development

ISO/NP 25906 Water quality — Determination of total organic carbon (TOC) and dissolved organic carbon (DOC) by wet chemical heated persulfate oxidation, followed by colorimetric measurement

Scope

Purpose

Comment on proposal

Discard changes?

Submit comment

Submit comment

Follow standard

Unfollow standard

Error