A Novel Eu-POM Sensor for Nitrite, Iodate and Bromate Detection

Polly-Anna Ashford is a guest web writer for Analytical Methods. She is currently a PhD student at the University of East Anglia, UK.

Detection of nitrite, iodate and bromate

Detection of nitrite, iodate and bromate with Eu-POM sensor

Nitrite, iodate and bromate are commonly found in food and drinking water and they can play important roles in human health. Iodine compounds, for example, are crucial to the smooth running of the thyroid, while bromate is a by-product of water purification. However, the consumption of excessive amounts of these ions can cause serious health issues. Current methods of detecting nitrite, iodate and bromate largely rely on expensive spectroscopic equipment and time consuming chemical analysis.

Li-Hua Bi and Li-Xin Wu from Jilin University, China, have developed a novel detection method which utilises the electrochemistry and redox properties of a europium polyoxometalate (Eu-POM) sensor. The Eu-POM is electrochemically reduced, leading to luminescence quenching and a change in the solution from colourless to blue. The presence of oxidising nitrite, iodate and bromate ions reverses this process, affording discolouration and luminescence recovery. The colour change can be recycled infinitely, and measured using a UV-vis spectrometer. This sensor demonstrates a good linearity relationship between absorbance and concentration of NO2, IO3 and BrO3.

The simplicity of this method, along with high sensitivity and low detection limits, make it an attractive prospect for future use in the sensing of these ions in solution.

A novel detection of nitrite, iodate and bromate based on a luminescent polyoxometalate
Bin Wang,  Rui-Qi Meng,  Ling-Xiao Xu,  Li-Xin Wu and Li-Hua Bi
Anal. Methods, 2013, Advance Article
DOI: 10.1039/C2AY26217G

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)