Title

MISSISSIPPI RIVER METHODS COMPARISON STUDY - IMPLICATIONS FOR WATER-QUALITY MONITORING OF DISSOLVED TRACE-ELEMENTS

Document Type

Article

Publication Date

5-1-1995

Department

Marine Science

Abstract

Recent reports have questioned the validity of dissolved trace element concentrations reported by the U.S. Geological Survey's National Stream Quality Accounting Network (NASQAN) as well as by other water-quality monitoring programs. To address these concerns and to evaluate the NASQAN protocols, the U.S. Geological Survey undertook the Mississippi River Methods Comparison Study. We report here the major results and implications of this study. In particular, we confirm the possible inaccuracy of previous NASQAN dissolved trace element data. The results suggest that all steps of the NASQAN protocol (sampling, processing, and analysis) require revision, though the sample filtration step appears to be of particular concern.

Publication Title

ENVIRONMENTAL SCIENCE & TECHNOLOGY

Volume

29

Issue

5

First Page

1313

Last Page

1317