A procedure is presented for routine analysis of total nitrogen in solution which is similar to published methods using oxidation by potassium persulfate. Careful attention to pH, alkalinity, the neutralizing buffer, reaction vessels, and dilution factors have proved necessary. This modified method is acceptable for samples from fresh to oceanic waters, is accurate for organic compounds tested, has a maximum capability of 40 µ M nitrogen in undiluted samples, and has a mid‐range precision of ±2%.
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Solórzano et al. (1980) studied this question.
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