Smartphone Detects Mercury

  • Author: Veronika Belusa
  • Published: 10 February 2014
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: ACS Nano/ACS Publications
  • Associated Societies: American Chemical Society (ACS), USA
thumbnail image: Smartphone Detects Mercury

Aydogan Ozcan, University of California, Los Angeles (UCLA), CA, USA, and colleagues developed a sensitive and cost-efficient smartphone-based device to easily measure levels of mercury(II) ions in water.

A device containing two disposable test tubes and two light-emitting diodes (LEDs) at 523 and 625 nm was attached to the built-in camera of a smart-phone. The test tubes contain gold nanoparticles (Au NPs) which are separated from each other by aptamers. When a water sample containing Hg2+ is added to one test tube, Hg2+ binds to the aptamers and the Au NPs start to clump. This causes the light they emit to shift from red to blue. Light of the LEDs is transmitted by the nanoparticle solutions towards the camera of the phone. A smartphone application for rapid digital image processing determines the Hg2+ concentration based on the color differences between the pictures of the two test tubes.

A limit of detection of ∼3.5 ppb was achieved; the maximum allowable level of Hg2+ in drinking water defined by the U.S. EPA is 2 ppb and by the WHO 6 ppb.

The researchers tested their device by measuring more than 50 samples collected from various sources including tap, river, lake, and ocean water samples.

Article Views: 3864

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permisson guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH