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An automatic gas-phase molecular absorption spectrometric system using a UV-LED photodiode based detector for determination of nitrate and total nitrate

Citation

Zhang, M and Zhang, Z and Yuan, D and Feng, S and Liu, B, An automatic gas-phase molecular absorption spectrometric system using a UV-LED photodiode based detector for determination of nitrate and total nitrate, Talanta, 84, (2) pp. 443-450. ISSN 0039-9140 (2011) [Refereed Article]

Copyright Statement

© 2011 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.talanta.2011.01.048

Abstract

An automatic gas-phase molecular absorption spectrometric (GPMAS) system was developed and applied to determine nitrite and total nitrate in water samples. The GPMAS system was coupled with a UV-light emitting diode photodiode (UV-LED-PD) based photometric detector, including a 255 nm UV-LED as the light source, a polyvinyl chloride (PVC) tube of 14 cm as the gas flow cell, and an integrated photodiode amplifier to measure the transmitted light intensity. The UV-LED-PD detector was compact, robust, simple and of low heat production, comparing with detectors used in other GPMAS works. For nitrite measurement, citric acid was used to acidify the sample, and ethanol to catalyze the quantitative formation of NO2. The produced NO2 was purged with air flow into the UV-LED-PD detector, and the gaseous absorbance value was measured. The total nitrate could be determined after being reduced to nitrite with a cadmium column. Limits of detection for nitrite and nitrate were 7 μmol/L and 12 μmol/L, respectively; and linear ranges of 0.021–5 mmol/L for nitrite and 0.036–4 mmol/L for nitrate were obtained. Related standard deviations were 1.81% and 1.08% for nitrite and nitrate, respectively, both at 2 mmol/L. The proposed method has been applied to determine nitrite and total nitrate in some environmental water samples.

Item Details

Item Type:Refereed Article
Keywords:light emitting diode, gas-phase molecular absorption spectrometry, nitrite
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Flow Analysis
Objective Division:Environment
Objective Group:Natural Hazards
Objective Field:Natural Hazards in Fresh, Ground and Surface Water Environments
Author:Zhang, M (Dr Min Zhang)
ID Code:104696
Year Published:2011
Web of Science® Times Cited:23
Deposited By:Chemistry
Deposited On:2015-11-18
Last Modified:2017-10-30
Downloads:0

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