Determination of total nitrogen in environmental samples: Validation by comparison of techniques and intralaboratory studies

S. Karthikeyan; J. He; U. M. Joshi; R. Balasubramanian

doi:10.1080/00032710902807797

Determination of total nitrogen in environmental samples: Validation by comparison of techniques and intralaboratory studies

S. Karthikeyan, J. He, U. M. Joshi, R. Balasubramanian

Research output: Journal Publication › Article › peer-review

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
Pages (from-to)	948-957
Number of pages	10
Journal	Analytical Letters
Volume	42
Issue number	7
DOIs	https://doi.org/10.1080/00032710902807797
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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10.1080/00032710902807797

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title = "Determination of total nitrogen in environmental samples: Validation by comparison of techniques and intralaboratory studies",

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.",

keywords = "Eutrophication, Flow injection, Flux, Intralaboratory, Total nitrogen",

author = "S. Karthikeyan and J. He and Joshi, {U. M.} and R. Balasubramanian",

note = "Funding Information: Received 16 September 2008; accepted 9 February 2009. The authors acknowledge the financial support received from Delft Hydraulics for this research project. Address correspondence to R. Balasubramanian, Division of Environmental Science and Engineering, National University of Singapore, Singapore 117576. E-mail: eserbala@nus.edu.sg",

year = "2009",

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doi = "10.1080/00032710902807797",

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AU - He, J.

AU - Joshi, U. M.

AU - Balasubramanian, R.

N1 - Funding Information: Received 16 September 2008; accepted 9 February 2009. The authors acknowledge the financial support received from Delft Hydraulics for this research project. Address correspondence to R. Balasubramanian, Division of Environmental Science and Engineering, National University of Singapore, Singapore 117576. E-mail: eserbala@nus.edu.sg

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Determination of total nitrogen in environmental samples: Validation by comparison of techniques and intralaboratory studies

Abstract

Keywords

ASJC Scopus subject areas

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