|  | Water Science					Recent 										Additions | Contact 										Us | 										Print 										Version 										Search: 										EPA 										Home > Water                     > Water Science                     > Analytical                     Methods > Method                     1631 > Revision E Fact Sheet |
|--|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

| Analytical MethodsGuidelines Establishing Test Procedures for the Analysis of Pollutants;         Measurement of Mercury in Water; Revisions to Method 1631; Final Rule
**Fact Sheet (EPA-821-F-02-020)**

**Summary**        EPA announces a final rule approving revisions to EPA Method 1631 for         the determination of low-level mercury in EPA's wastewater program (40         CFR part 136). The newly approved Method 1631, Revision E, is clearer,         more responsive to stakeholder needs, and better in laboratory performance.       

**Background**

The U.S. Environmental Protection Agency (EPA) approves analytical methods         used to determine chemical components of wastewater. Method 1631 allows         determination of mercury at a minimum level of 0.5 ppt (parts-per-trillion).         This minimum level supports the measurement of mercury at the lowest water         quality criteria (WQC) levels published in the National Toxics Rule and         in the Final Water Quality Guidance for the Great Lakes System.**Method 1631, Revision E**

Method 1631, Revision E replaces all previous versions of Method 1631.         Revision E includes changes based on recommendations from the laboratory         community. These changes improve method performance and increase clarity         and method flexibility. This final rule also amends 40 CFR 136.3 (e) Table         II to incorporate method revisions on preservation and storage of low-level         mercury samples. Revision E retains the clean technique procedures of         the previously promulgated Revision C.

**Additional Information and Copie**s

For further information concerning this final rule, please contact William         Telliard at the U.S. EPA Office of Water, Engineering and Analysis Division         (4303T), 1200 Pennsylvania Avenue, Washington, D.C. 20460; (Email: [email protected])

You can find the complete text of the Federal Register notice on the         Internet athttp://epa.gov/waterscience/methods.

  

  |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

|                                                                         |  | Wastewater Management | Drinking Water | Wetlands, Oceans, and Watersheds |
|-------------------------------------------------------------------------|--|---------------------------------------------------------------------------|
|                                                                    |
|                                                                         |
| EPA Home | 				Privacy and 				Security Notice | 				Contact Us

  |