Nanotechnology Now

Our NanoNews Digest Sponsors





Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Tracing the Traces

Abstract:
Nanogram concentrations of a toxic compound detected in chlorinated tap water

Tracing the Traces

Weinheim, Germany | Posted on December 23rd, 2009

Drinking water can transmit a number of diseases, including typhoid, dysentery, cholera, and diarrhea, which can then spread explosively throughout an entire service area. To avoid this problem, drinking water must be disinfected. After treatment and disinfection, the water is usually safe. To manage the disease risk until it reaches the tap, most waterworks throughout the world use chlorine or chlorine-containing chemicals for disinfection. Beneficial though the chlorination of water may be, it does have one potential drawback: studies have suggested that there may be a connection between the ingestion of chlorinated tap water and an increased risk of bladder cancer. Scientists at the University of Alberta in Canada have now revealed a chlorination by-product of great interest: As the team led by Xing-Fang Li reports in the journal Angewandte Chemie, they were able to detect traces of the toxic compound dichloroquinone.

Chlorination has been use to disinfect water for decades. Through reactions with natural organic molecules in the water, it can lead to formation of trace amounts of toxic by-products, such as chloroform and halogenated acetic acid derivatives. The maximum allowed concentrations of these substances were legally regulated some years ago. Newer studies have suggested that these substances are not likely to pose a cancer risk. Instead, other possible by-products, such as halogenated quinones, which may be present in treated water at previously undetectable concentrations, are now under suspicion. Quinones are six-membered carbon rings with two oxygen atoms bound by double bonds to opposite ends of the molecule, and they occur in some microorganisms. Quinones that also contain halogen atoms such as chlorine or bromine may react with DNA and proteins at very low concentrations, causing damage to organisms.

The Canadian team has now been the first to successfully identify a representative of this class of compounds, 2,6-dichloro-1,4-benzoquinone, in chlorinated drinking water. To accomplish this, the researchers had to develop a special analytical procedure based on liquid chromatography (LC), electrospray ionization (ESI), and tandem mass spectrometry (tandem-MS). In actual water samples, they used this technique to detect this compound in quantities of a few nanograms per liter of water. The toxicology of some chloroquinones indicates that they could pose a risk of bladder cancer.

Author: Xing-Fang Li, University of Alberta, Edmonton (Canada), www.ualberta.ca/~xingfang/contact.html

Title: A Toxic Disinfection By-product, 2,6-Dichloro-1,4-benzoquinone, Identified in Drinking Water

Angewandte Chemie International Edition 2010, 49, No. 4, Permalink: dx.doi.org/10.1002/anie.200904934

####

For more information, please click here

Contacts:
Amy Molnar (US)


Jennifer Beal (UK)


Alina Boey (Asia)

Copyright © Angewandte Chemie

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Nano Ruffles in Brain Matter: Freiburg researchers decipher the role of nanostructures around brain cells in central nervous system function October 31st, 2014

Gold nanoparticle chains confine light to the nanoscale October 31st, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Device invented at Johns Hopkins provides up-close look at cancer on the move: Microscopic view of metastasis could give insight about how to keep cancer in check October 31st, 2014

Announcements

Nano Ruffles in Brain Matter: Freiburg researchers decipher the role of nanostructures around brain cells in central nervous system function October 31st, 2014

Gold nanoparticle chains confine light to the nanoscale October 31st, 2014

'Nanomotor lithography' answers call for affordable, simpler device manufacturing October 31st, 2014

Device invented at Johns Hopkins provides up-close look at cancer on the move: Microscopic view of metastasis could give insight about how to keep cancer in check October 31st, 2014

Water

Iranians Present Model to Predict Photocatalytic Process in Removal of Pollutants October 30th, 2014

Nanoparticles Display Ability to Improve Efficiency of Filters October 28th, 2014

Iranian, Malaysian Scientists Study Nanophotocatalysts for Water Purification October 23rd, 2014

New Nanocomposites Help Elimination of Toxic Dyes October 15th, 2014

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More














ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE