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Simultaneous determination of nitrite and nitrate at nanomolar level in seawater using on-line solid phase extraction hyphenated with liquid waveguide capillary cell for spectrophotometric detection

Citation

Zhang, M and Yuan, D and Chen, G and Li, Q and Zhang, Z and Liang, Y, Simultaneous determination of nitrite and nitrate at nanomolar level in seawater using on-line solid phase extraction hyphenated with liquid waveguide capillary cell for spectrophotometric detection, Microchimica Acta: Micro and Trace Analysis, 165, (3) pp. 427-435. ISSN 0026-3672 (2009) [Refereed Article]

Copyright Statement

Copyright 2009 Springer-Verlag

DOI: doi:10.1007/s00604-009-0158-y

Abstract

A flow system coupled with on-line solid phase extraction (SPE) and liquid waveguide capillary cell (LWCC) spectrophotometric detection has been established to simultaneously determine nanomolar levels of nitrite and nitrate in surface seawaters. The azo-compound that formed from nitrite could be quantitatively extracted on HLB SPE cartridge, and then eluted and detected in a LWCC detector of 16 cm path length. In a separated portion of sample, nitrate was reduced to nitrite with a Cu–Cd reduction column. The initial and reduced nitrite together formed azo-compound in a parallel flow channel, and the azo-compound formed was extracted, eluted and detected via the same way as that of nitrite. Due to the hyphenation of SPE and LWCC, the matrix interferences to the performance of LWCC could be avoided. Limit of detections at the nanomolar level (0.3 nmol L−1 for nitrite and 1.5 nmol L−1 for nitrate) were obtained. Application to seawater analysis showed good agreement with an alternative analytical configuration.

Item Details

Item Type:Refereed Article
Keywords:nitrite, nitrate, liquid waveguide capillary cell, on-line solid phase extraction, seawater
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:104701
Year Published:2009
Web of Science® Times Cited:23
Deposited By:Chemistry
Deposited On:2015-11-18
Last Modified:2016-03-30
Downloads:0

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