Abstract
A rapid, microwave-based extraction method was employed to oxidize all forms of nitrogen to nitrate in environmental samples using persulfate. The digest was then analyzed spectrophotometrically after an offline reduction of nitrate to nitrite using a cadmium reductor column was completed. The precision of the method was tested at the 0.5 mg l-1 level and was 5.2% (N = 10). The detection limit based on S/N = 3 was calculated to be 0.15 mg l-1. The method was thoroughly validated by comparison of analytical techniques and intralaboratory comparison studies.
Original language | English |
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Pages (from-to) | 948-957 |
Number of pages | 10 |
Journal | Analytical Letters |
Volume | 42 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jan 2009 |
Externally published | Yes |
Keywords
- Eutrophication
- Flow injection
- Flux
- Intralaboratory
- Total nitrogen
ASJC Scopus subject areas
- Analytical Chemistry
- Biochemistry
- Spectroscopy
- Clinical Biochemistry
- Biochemistry, medical
- Electrochemistry
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Karthikeyan, S., He, J., Joshi, U. M., & Balasubramanian, R. (2009). Determination of total nitrogen in environmental samples: Validation by comparison of techniques and intralaboratory studies. Analytical Letters, 42(7), 948-957. https://doi.org/10.1080/00032710902807797