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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 |
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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: | Environmental Management |
Objective Group: | Marine systems and management |
Objective Field: | Measurement and assessment of marine water quality and condition |
UTAS Author: | Zhang, M (Dr Min Zhang) |
ID Code: | 104701 |
Year Published: | 2009 |
Web of Science® Times Cited: | 29 |
Deposited By: | Chemistry |
Deposited On: | 2015-11-18 |
Last Modified: | 2016-03-30 |
Downloads: | 0 |
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