# Guidelines Establishing Test Procedures for the Measurement of Mercury in Water (EPA Method 1631, Revision C); Final Rule, Technical Corrections
> **Rule** · Final rule; technical corrections. · Published 2001-06-18 · Effective 2001-07-18 · 66 FR 32774
## Document
- **Document number:** 01-15145
- **Category:** water-quality
- **Federal Register citation:** 66 FR 32774
- **CFR reference:** 40 CFR 136
- **Publication date:** 2001-06-18
- **Effective date:** 2001-07-18
- **EPA docket:** FRL-6998-5
## Abstract

EPA is amending the "Guidelines Establishing Test Procedures for the Analysis of Pollutants" to make minor technical corrections to clarify the use of field blanks for mercury testing under the Clean Water Act. Specifically, the amendments rectify an omission in the text of the promulgated version of Method 1631: Mercury in Water by Oxidation, Purge and Trap and Cold Vapor Atomic Fluorescence Spectrometry.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/06/18/01-15145/guidelines-establishing-test-procedures-for-the-measurement-of-mercury-in-water-epa-method-1631)
---
*AI Analytics · CC0 1.0*