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Errors in Analyses for Ammonium and Nitrate Caused by Contamination from Filter Papers¹

ABSTRACT

Filter papers were tested for NH₄ and NO₃ contamination by eluting them with 2 M KCl solution and analyzing the leachate. Significant amounts of NH₄ or NO₃-N were found in many filters. Variability between grades and kinds of filters, among lots within a grade, and within packages was high. For cellulose papers, quantitative grades were usually relatively high in NH₄ and low in NO₃. The reverse was true for qualitative grades. Glass fiber filters contained low but usually significant amounts of both ions. Most of the NH₄- and NO₃-N was removed from cellulose filters by prewashing with water or 2 M KCl solution. Water successfully removed NO^-₃ but not NH⁺₄ from glass filters.

¹ Paper no. J-168 of the Journal Series of the Alaska Agricultural and Forestry Experiment Station.

² Assistant Professor of Agronomy and Agronomy Technician, respectively, Agricultural and Forestry Experiment Station, Univ. of Alaska, Fairbanks, AK 99775-0080.

Received for publication April 24, 1986.