Summary
This paper describes the development of a novel inlaid microfluidic platform for rapid nitrite determination in aquatic systems, employing continuous flow with reagent injection and colorimetric spectrophotometry via the Griess assay. The device significantly reduces reagent consumption whilst maintaining analytical sensitivity, achieving sampling frequencies suitable for high-frequency environmental monitoring. Validation against standard concentrations and literature attenuation coefficients demonstrates technical feasibility for deployment in marine nutrient monitoring applications.
UK applicability
The microfluidic technology may have application to United Kingdom coastal and estuarine monitoring programmes, particularly those investigating nutrient cycling and eutrophication in marine systems. However, the abstract does not address UK-specific regulatory or environmental contexts, and field deployment validation would be required before practical adoption.
Key measures
Sampling frequency (samples per hour), limit of detection (nM), limit of quantification (nM), attenuation coefficients, reagent consumption volume (µL), nitrite concentration range (0.125–10 µM)
Outcomes reported
The study developed and validated a microfluidic device capable of continuous nitrite determination using the Griess assay with minimal reagent consumption. The device achieved a sampling frequency of at least 10 samples per hour with a limit of detection of 94 nM and limit of quantification of 312 nM for a 20 µL injection volume.
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