A selection of filter-papers was tested for the presence of ammonia. The degree of contamination of filtrates was also determined. In both instances, significant levels of ammonia were found. Hardened filter-papers contained significantly higher levels of ammonia.
L. Ó. hAlmhain and D. Ó. Danachair, Analyst, 1974, 99, 211 DOI: 10.1039/AN9749900211
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