Abstract
A persulfate digestion method for particulate nitrogen and phosphorus in aufwuchs suspensions was tested on two types of dried materials (orchard leaves and aufwuchs) and samples from a freshwater microcosm. Recoveries ranged from 80–100% depending on the reference material composition, and coefficients of variation were from 1.3–26.8% for nitrogen and 0.3–9.3% for phosphorus. The ease of the persulfate method is an advantage over the Kjeldahl procedure and in addition, the method appears to be well suited for analysis of particulate nitrogen and phosphorus in freshwater aufwuchs communities.
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