Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Iranian Researchers Develop Simple Method to Measure Lead Levels

Abstract:
Iranian researchers succeeded in developing a simple test to quickly and accurately measure lead (II) levels in aqueous solutions down to very low concentrations.

Iranian Researchers Develop Simple Method to Measure Lead Levels

Iran | Posted on August 18th, 2010

The test, developed by Razi University researchers, uses a solution of azacrown ether-modified AuNPs, which changes color in the presence of the toxic metal ion. This color change is visually discernible by an appearance of the surface plasmon band (SPB) at 520 nm.

The recognition mechanism is attributed to the unique structure of monoazacrown ether attached to AuNPs and metal sandwiches coordinated between two azacrown ether moieties that are attached to separate AuNPs. This inter particle cross-linking results in aggregation and an apparent color change from brown to purple.

The sensor is selective against alkali-, alkaline-earth- and heavy-transition-metal ions. Such selectivity is essential for applications involving real environmental samples. Compared with many current optical chemosensors for lead (II), this sensor is rapid, cost-effective and enzyme-free.

The system allows easy detection of lead ions by the naked eye without resorting to any expensive instruments. Significantly, this method can, in principle, be used to detect other metal ions by changing the structure and the size of ionophores that selectively bind other metal ions.

The work, performed in collaboration with different teams, was managed by Dr Abdolhamid Alizadeh, the head of the nanoparticle research group at the Nanoscience and Nanotechnology Research Center (NNRC), Razi University, Kermanshah, western Iran,

Also Prof. Mohammad M Khodaei, University President. Changiz Karami is a graduate student in the group of Dr Alizadeh and is supported by a scholarship of the Iran Nanotechnology Initiative Council (INIC).

The functionalized thiols were synthesized in collaboration with Prof. M S Workentin, Department of Chemistry, University of Western Ontario, Canada. The UV-Vis experiments were conducted in collaboration with Prof. Mojtaba Shamsipour and his PhD student, Marzieh Sadeqi, in the Chemistry Department at Razi University.

The main research interest of Alizadeh's group is directed towards the investigation of parameters that affect the mechanisms and dynamics of organic reactions, such as condensation, coupling and complexation, occurring in ordered environments like gold nanoparticle surfaces.

The team is currently exploring new and selective protocols for adding (or removing) functionality to the surface of metallic nanoparticles.

####

For more information, please click here

Copyright © FARS

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

Novel nanoparticle-based approach detects and treats oral plaque without drugs August 17th, 2018

UVA multidisciplinary engineering team designs technology for smart materials: The invention could lead to devices and manufactured goods, such as fabrics, that can dynamically regulate between thermally insulating and cooling August 17th, 2018

Smallest transistor worldwide switches current with a single atom in solid electrolyte: Milestone of energy efficiency in information technology -- Publication in Advanced Materials August 17th, 2018

Scientists turn to the quantum realm to improve energy transportation August 17th, 2018

Academic/Education

The Institute of Applied Physics at the University of Tsukuba near Tokyo in Japan uses Deben's ARM2 detector to better understand catalytic reaction mechanisms June 27th, 2018

Powering the 21st Century with Integrated Photonics: UCSB-Led Team Selected for Demonstration of a Novel Waveguide Platform Which is Transparent Throughout the MWIR and LWIR Spectral Bands June 19th, 2018

SUNY Poly Professor Eric Lifshin Selected for ‘Fellow of the Microanalysis Society’ Position for Significant Contributions to Microanalysis June 13th, 2018

Grand Opening of UC Irvine Materials Research Institute (IMRI) to Spotlight JEOL Center for Nanoscale Solutions: Renowned Materials Scientists to Present at the 1st International Symposium on Advanced Microscopy and Spectroscopy (ISAMS) April 18th, 2018

Announcements

Novel nanoparticle-based approach detects and treats oral plaque without drugs August 17th, 2018

UVA multidisciplinary engineering team designs technology for smart materials: The invention could lead to devices and manufactured goods, such as fabrics, that can dynamically regulate between thermally insulating and cooling August 17th, 2018

Smallest transistor worldwide switches current with a single atom in solid electrolyte: Milestone of energy efficiency in information technology -- Publication in Advanced Materials August 17th, 2018

Scientists turn to the quantum realm to improve energy transportation August 17th, 2018

Environment

Particles pull last drops of oil from well water: Rice University engineers find nanoscale solution to 'produced water' problem August 15th, 2018

FEFU scientists reported on toxicity of carbon and silicon nanotubes and carbon nanofibers: Nanoparticles with a wide range of applying, including medicine, damage cells of microalgae Heterosigma akashivo badly. July 18th, 2018

Nanomaterials could mean more algae outbreaks for wetlands, waterways: High tech metal particles may inadvertently take a toll on aquatic life June 26th, 2018

Squeezing light at the nanoscale: Ultra-confined light could detect harmful molecules June 17th, 2018

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



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project