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A procedure for the simultaneous determination of Total N and Total P in freshwater using persulphate microwave digestion.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>10/1992
<mark>Journal</mark>Water Research
Issue number10
Number of pages5
Pages (from-to)1281-1285
Publication StatusPublished
<mark>Original language</mark>English


In the absence of a suitable method for routine analysis of large numbers of natural river water samples for organic nitrogen and phosphorus fractions, a new simultaneous digestion technique was developed, based on a standard persulphate digestion procedure. This allows rapid analysis of river, lake and groundwater samples from a range of environments for total nitrogen and phosphorus.

The method was evaluated using a range of organic nitrogen and phosphorus structures tested at low, mid and high range concentrations from 2 to 50 mg l−1 nitrogen and 0.2 to 10 mg l−1 phosphorus. Mean recoveries for nitrogen ranged from 94.5% (2 mg l−1) to 92.7% (50 mg l−1) and for phosphorus were 98.2% (0.2 mg l−1) to 100.2% (10 mg l−1). The method is precise in its ability to reproduce results from replicate digestions, and robust in its ability to handle a variety of natural water samples in the pH range 5–8

Bibliographic note

A procedure for the simultaneous determination of Total N and Total P in freshwaters using persulphate microwave digestion. 1 cites: http://scholar.google.com/scholar?num=100&hl=en&lr=&cites=1260981972087475959