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

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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.

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