Publication Citation

USGS Series Open-File Report
Report Number 93-638
Title Automated, colorimetric methods for determination of nitrate plus nitrite, nitrite, ammonium and orthophosphate ions in natural water samples
Edition -
Language ENGLISH
Author(s) Antweiler, Ronald C.; Patton, Charles J.; Taylor, Howard E.
Year 1996
Originating office
USGS Library Call Number (200) R29o no.93-638
Physical description iv, 23 p. :ill. ;28 cm.
ISBN

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Abstract

The apparatus and methods used for the automatic, colorimetric determinations of dissolved nutrients (nitrate plus nitrite, nitrite, ammonium and orthophosphate) in natural waters are described. These techniques allow for the determination of nitrate plus nitrite for the concentration range 0.02 to 8 mg/L (milligrams per liter) as N (nitrogen); for nitrite, the range is 0.002 to 1.0 mg/L as N; for ammonium, the range is 0.006 to 2.0 mg/L as N; and for orthophosphate, the range is 0.002 to 1.0 mg/L as P (phosphorus). Data are presented that demonstrate the accuracy, precision and quality control of the methods.