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In-field determination of nanomolar nitrite in seawater using a sequential injection technique combined with solid phase enrichment and colorimetric detection

Citation

Chen, G and Yuan, D and Huang, Y and Zhang, M and Bergman, M, In-field determination of nanomolar nitrite in seawater using a sequential injection technique combined with solid phase enrichment and colorimetric detection, Analytica Chimica Acta, 620, (1-2) pp. 82-88. ISSN 0003-2670 (2008) [Refereed Article]

Copyright Statement

Copyright 2008 Elsevier B.V.

DOI: doi:10.1016/j.aca.2008.05.019

Abstract

A novel sequential injection method for the determination of nitrite at nanomolar level in seawater samples has been developed. The pink azo compound was formed based on the Griess reaction and quantitatively adsorbed onto a Sep-Pak C18 cartridge. The enriched azo compound was rinsed with water and ethanol (28%, v/v) in turn, and then eluted with an eluent containing 26.6% (v/v) ethanol and 0.108 mol L−1 H2SO4. Finally the azo compound was measured using a spectrophotometer at 543 nm. Under the optimized conditions, the linear calibration ranges were 0.71–42.9 nmol L−1 for a 150-mL sample and 35.7–429 nmol L−1 for a 15-mL sample. The relative standard deviation of 8 measurements was 1.44% for 14.3 nmol L−1 nitrite. For the 150 mL sample, the detection limit was estimated to be 0.1 nmol L−1. The throughput of the method was about 4 samples per hour. The proposed method has been successfully applied to the in-field determination of nanomolar concentrations of nitrite in seawater.

Item Details

Item Type:Refereed Article
Keywords:nitrite, seawater, sequential injection, solid phase extraction
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Flow Analysis
Objective Division:Environment
Objective Group:Physical and Chemical Conditions of Water
Objective Field:Physical and Chemical Conditions of Water in Marine Environments
Author:Zhang, M (Dr Min Zhang)
ID Code:104703
Year Published:2008
Web of Science® Times Cited:30
Deposited By:Chemistry
Deposited On:2015-11-18
Last Modified:2016-03-30
Downloads:0

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