Holcombe, Elly E.; Moore, Duane G.; Fredriksen, Richard L. 1986. An improved method of chemical analysis for low levels of nitrogen in forest streams or in rainwater. Res. Note PNW-449. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 12 p.
A modification of the macro-Kjeldahl method that provides increased sensitivity wasdeveloped for determining very low levels of nitrogen in forest streams and in rain-water. The method is suitable as a routine laboratory procedure. Analytical range ofthe method is 0.02 to 1.5 mg/L with high recovery and excellent precision and ac-curacy. The range can be increased to include higher levels of nitrogen by dilutionof samples at time of Nesslerization, or by using smaller volumes of samples at thestart of the analysis.
Keywords: Chemical analysis, nitrogen, water analysis, laboratory methods.