Journal ArticleDOI
Microfluidic colourimetric chemical analysis system: application to nitrite detection.
Vincent J. Sieben,Vincent J. Sieben,Cedric F.A. Floquet,I. R. G. Ogilvie,Matthew C. Mowlem,Hywel Morgan +5 more
TLDR
In this article, a continuous flow, microfluidic absorption cell and detection system for detecting nitrite using the Griess reaction is described. But the system was used to detect nitrite, but it could equally be used to assay a range of different chemistries using colourimetric methods.Abstract:
The design, fabrication, analysis and characterisation of a continuous flow, microfluidic absorption cell and detection system is described. A low cost optical illumination and detection method is integrated with a simple microfluidic system. Nitrite is detected at nM concentration using the Griess reaction. The device is based on a novel optical absorption scheme with microfluidic channels made from tinted PMMA. An absorbance path length of 25 mm enables nitrite to be detected from 50 nM to 10 μM with a limit of detection of 14 nM. The system was used to characterise the reaction kinetics and maximum sample resolution. In this report the system is used to detect nitrite, but it could equally be used to assay a range of different chemistries using colourimetric methods. The system provides a cost-effective, simple system that could be deployed in a range of scenarios for environmental monitoring.read more
Citations
More filters
Journal ArticleDOI
Indirect photochemistry in sunlit surface waters: photoinduced production of reactive transient species.
TL;DR: The main transients (˙OH, CO3(-˙) , (1)O2, and CDOM triplet states) are involved in the indirect phototransformation of a very wide range of persistent organic pollutants in surface waters.
Journal ArticleDOI
Lab-on-Chip Measurement of Nitrate and Nitrite for In Situ Analysis of Natural Waters
Alexander Beaton,Christopher L. Cardwell,Rupert S. W. Thomas,Vincent J. Sieben,François-Eric Legiret,François-Eric Legiret,Edward M. Waugh,Peter J. Statham,Matthew C. Mowlem,Hywel Morgan +9 more
TL;DR: The first of a new generation of microfluidic chemical analysis systems with sufficient analytical performance and robustness for deployment in natural waters is presented, demonstrating the ability of the system to acquire data with high temporal resolution.
Journal ArticleDOI
Highly sensitive label-free colorimetric sensing of nitrite based on etching of gold nanorods
TL;DR: A simple colorimetric method with high sensitivity and selectivity was developed for sensing of nitrite as low as 4.0 μM by naked eyes, which is based on etching of gold nanorods accompanied by shape changes in aspect ratios and a visible color change from bluish green to red and then to colorless with the increase of nitrites.
Journal ArticleDOI
Hydrogels and Their Role in Biosensing Applications
TL;DR: An overview of different hydrogels and the role they adopt in a range of applications can be found in this article, where the advantages and performance improvements are described, along with their limitations.
Journal ArticleDOI
A colorimetric hydrogel biosensor for rapid detection of nitrite ions
TL;DR: In this paper, a colorimetric Griess assay was performed on the hydrogel modified with N-(1-naphthyl)ethylenediamine by dropping a solution of nitrite and sulfanilamide.
References
More filters
Journal ArticleDOI
Miniaturized total chemical analysis systems: A novel concept for chemical sensing
TL;DR: In this paper, a modular construction of a miniaturized "total chemical analysis system" is proposed, and theoretical performances of such systems based on flow injection analysis, chromatography and electrophoresis are compared with those of existing chemical sensors and analysis systems.
Journal ArticleDOI
A new coupling component for sulfanilamide determination
A. Calvin Bratton,E. K. Marshall +1 more
Journal ArticleDOI
Seaglider: a long-range autonomous underwater vehicle for oceanographic research
TL;DR: Seagliders are small, reusable autonomous underwater vehicles designed to glide from the ocean surface to a programmed depth and back while measuring temperature, salinity, depth-averaged current, and other quantities along a sawtooth trajectory through the water as mentioned in this paper.
Journal ArticleDOI
Micro total analysis systems. Latest advancements and trends.
TL;DR: In this paper, the authors present a review of the book.http://www.reviewreviews.com/reviews/book-reviews-of-the-book