Lab-on-Chip Measurement of Nitrate and Nitrite for In Situ Analysis of Natural Waters

Beaton, Alexander D., Cardwell, Christopher L., Thomas, Rupert S., Sieben, Vincent J., Legiret, François-Eric, Waugh, Edward M., Statham, Peter J., Mowlem, Matthew C. and Morgan, Hywel (2012) Lab-on-Chip Measurement of Nitrate and Nitrite for In Situ Analysis of Natural Waters Environmental Science & Technology, 46, (17), pp. 9548-9556. (doi:10.1021/es300419u).


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Microfluidic technology permits the miniaturization of chemical analytical methods that are traditionally undertaken using benchtop equipment in the laboratory environment. When applied to environmental monitoring, these “lab-on-chip” systems could allow high-performance chemical analysis methods to be performed in situ over distributed sensor networks with large numbers of measurement nodes. Here we present the first of a new generation of microfluidic chemical analysis systems with sufficient analytical performance and robustness for deployment in natural waters. The system detects nitrate and nitrite (up to 350 ?M, 21.7 mg/L as NO3 ?) with a limit of detection (LOD) of 0.025 ?M for nitrate (0.0016 mg/L as NO3 ?) and 0.02 ?M for nitrite (0.00092 mg/L as NO2 ?). This performance is suitable for almost all natural waters (apart from the oligotrophic open ocean), and the device was deployed in an estuarine environment (Southampton Water) to monitor nitrate+nitrite concentrations in waters of varying salinity. The system was able to track changes in the nitrate?salinity relationship of estuarine waters due to increased river flow after a period of high rainfall.
Laboratory characterization and deployment data are presented, demonstrating the ability of the system to acquire data with high temporal resolution.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1021/es300419u
ISSNs: 0013-936X (print)
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QD Chemistry
T Technology > T Technology (General)
Organisations: Electronics & Computer Science, Ocean Biochemistry & Ecosystems, Ocean Technology and Engineering
ePrint ID: 343350
Date :
Date Event
Date Deposited: 01 Oct 2012 16:12
Last Modified: 17 Apr 2017 16:34
Further Information:Google Scholar

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