Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Google Analytics Dashboard for Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-147 (trace constituents), T-149 (trace constituents), M-142 (major constituents), N-53 (nutrient constituents), N-54 (nutrient constituents), P-28 (low ionic strength constituents) GW-1 (ground-water constituents), and Hg-24 (mercury) distributed in April 1997

Results of the U.S. Geological Survey's analytical evaluation program for standard reference samples : T-147 (trace constituents), T-149 (trace constituents), M-142 (major constituents), N-53 (nutrient constituents), N-54 (nutrient constituents), P-28 (low ionic strength constituents) GW-1 (ground-water constituents), and Hg-24 (mercury) distributed in April 1997

URI: https://pubs.usgs.gov/publication/ofr97553

Display as: