Flow injection determination of nitrate in estuarine and coastal waters

McCormack, Trevor; David, Anthony R. J.; Worsfold, Paul J.; Howland, R.J.M.

doi:10.1039/ai9943100081

Cited by 13 publications

(5 citation statements)

References 6 publications

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“…While nitrite standards are unstable due to oxidation, nitrate standards can be preserved for several months using a biocide (e.g., 0.1% chloroform 66 ). Griess reagent must be protected from light, but will eventually (after several weeks) develop color and increase its background absorption.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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

Beaton

Cardwell

Thomas

et al. 2012

Environ. Sci. Technol.

164

190

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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 μM, 21.7 mg/L as NO(3)(-)) with a limit of detection (LOD) of 0.025 μM for nitrate (0.0016 mg/L as NO(3)(-)) and 0.02 μM for nitrite (0.00092 mg/L as NO(2)(-)). 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.

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Section: ■ Results and Discussionmentioning

confidence: 99%

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

Beaton

Cardwell

Thomas

et al. 2012

Environ. Sci. Technol.

164

190

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show abstract

“…NO3 -. Nitrate is analyzed by a standard absorption technique (6). This method involves reduction to nitrite with copperized cadmium followed by diazotization with sulfanilamide and naphthylethylenediamine (NED) to form a pink-purple azo dye, thus the results indicate the total amount of nitrate and nitrite.…”

Section: Continuous Flow Analysismentioning

confidence: 99%

Technique for Continuous High-Resolution Analysis of Trace Substances in Firn and Ice Cores

Röthlisberger¹,

Bigler²,

Hutterli³

et al. 1999

Environ. Sci. Technol.

222

227

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The very successful application of a CFA (Continuous flow analysis) system in the GRIP project (Greenland Ice Core Project) for high-resolution ammonium, calcium, hydrogen peroxide, and formaldehyde measurements along a deep ice core led to further development of this analysis technique. We included methods for continuous analysis of sodium, nitrate, sulfate, and electrolytical conductivity, while the existing methods have been improved. The melting device has been optimized to allow the simultaneous analysis of eight components. Furthermore, a new melter was developed for analyzing firn cores. The system has been used in the frame of the European Project for Ice Coring in Antarctica (EPICA) for in-situ analysis of several firn cores from Dronning Maud Land, Antarctica, and for the new ice core drilled at Dome C, Antarctica.

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“…In the following section we provide the main references that describe the system and refer the reader to Erhardt et al (2022a) for a more detailed discussion of the system and its development over the years. The wet-chemistry (or main Bern CFA) system uses a range of analyte specific absorption and fluorescence spectroscopy methods to measure the low concentration of dissolved Ca 2+ (Tsien et al, 1982), Na + (Quiles et al, 1993), NH + 4 (Genfa and Dasgupta, 1989), NO − 3 (McCormack et al, 1994) and H 2 O 2 (Dasgupta and Hwang, 1985) (hydrogen peroxide) in the ice. All of these methods were specifically adapted for the CFA ice-core measurements (Sigg et al, 1994;Röthlisberger et al, 2000;Kaufmann et al, 2008) and employ custombuilt spectrometers as described in detail in (Kaufmann et al, 2008).…”

Section: Wet Chemistry Measurementsmentioning

confidence: 99%

High resolution aerosol data from the top 3.8 ka of the EGRIP ice core

Erhardt

Jensen

Adolphi

et al. 2023

Preprint

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Abstract. Here we present the high-resolution CFA data from the top 479 m of the East Greenland Ice coring Project (EGRIP) ice core covering the past 3.8 thousand years. The data consists of 1 mm-depth-resolution profiles of calcium, sodium, am- monium, nitrate and electrolytic conductivity as well as decadal averages of these profiles. Alongside the data we provide a description of the measurement setup, procedures, the relevant references for the specific methods as well as an assessment of the precision of the measurements, the sample to depth assignment and the depth and temporal resolution of the data set. The nominally 1-mm data represents an oversampling of the record as the true resolution is limited by the analytical setup to approximately 1 cm. The error of absolute depth assignment of the data may be on the order of 1 cm, however relative depth offsets be- tween the records of the individual species is only on the order of 1 mm. The presented data has sub-annual resolution over the entire depth range and has already formed part of the data for an annually layer-counted time scale for the EGRIP ice core used to improve and revise the multi-core Greenland ice-core chronology (GICC05) to a new version,GICC21 (Sinnl et al., 2021). The data is available in full 1-mm resolution and decadal averages on PANGAEA (https://doi.org/10.1594/PANGAEA.945293 (Erhardt et al., 2022b))

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Flow injection determination of nitrate in estuarine and coastal waters

Cited by 13 publications

References 6 publications

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

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

Technique for Continuous High-Resolution Analysis of Trace Substances in Firn and Ice Cores

High resolution aerosol data from the top 3.8 ka of the EGRIP ice core

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