Navigation Links
Prototype NIST method detects and measures elusive hazards
Date:11/18/2009

A chemist at the National Institute of Standards and Technology (NIST) has demonstrated a relatively simple, inexpensive method for detecting and measuring elusive hazards such as concealed explosives and toxins, invisible spoilage in food or pesticides distributed in soil by wind and rain. The prototype method is more sensitive than conventional techniques for detecting traces of these materials, which are polarlike water molecules, having distinct electrically positive and negative endsand do not readily evaporate.

As described in a new paper,* NIST researcher Tom Bruno enhanced a technique called "headspace analysis," which is the detection and analysis of trace levels of chemical compounds from a solid or liquid that are released into the surrounding atmosphere. Bruno's enhancements greatly improve the efficiency of sample collection, for the first time making the technique suitable for detecting low concentrations of polar, low-volatility, compounds such as explosives. Preliminary results indicate the method is sensitive enough to measure amounts of target materials that constitute as little as 0.0000002 percent of a sample.

The sample collection device consists of several coils of fine tubing just 0.32 millimeters in inner diameter. Bruno modified the inner coating, which efficiently attracts and retains chemicals across its large surface area. The device can be used with a sample-heating oven as part of a laboratory analysis system or taken into the field for sample collection. To extract target molecules from a sample, the coil is placed inside an insulated cylinder and chilled with a cold air stream to minus 40 degrees Celsius. A gas, such as helium, is swept across the sample held in the oven or the coil device, gathering up target molecules along the way, and through the fine tubing. Chilling the coilspart of Bruno's innovationmakes collection of target molecules more efficient. The tubing is washed with a solvent, or heated, to release the captured molecules for analysis.

Bruno found that the mass of the collected molecules increases with rising oven and sweep gas temperatures, offering a way to detect specific target molecules under particular field conditions. NIST researchers demonstrated the new method using several explosives, including the pure explosive TNT and the plastic explosive mixture C-4. Among other applications, NIST researchers have used the method to improve sampling and analysis of fire retardants in a car interior, a topic of interest because of concerns expressed by some that the "new car smell" may be a health hazard. They also are using the method to detect volatile protein decomposition products in spoiled meats. Environmental applications could include detection of pesticides deposited on soils subject to weathering effects.


'/>"/>

Contact: Laura Ost
laura.ost@nist.gov
303-497-4880
National Institute of Standards and Technology (NIST)
Source:Eurekalert

Related biology technology :

1. ExonHit Completes a Prototype to Detect Alzheimers Disease From Blood
2. Phosphagenics Announces Completion of Transdermal Patch Prototypes
3. International Scientific Workshop Focuses on New Methods for Vaccine and Antibody Development
4. NIST team develops novel method for nanostructured polymer thin films
5. Nanofabrication method paves way for new optical devices
6. New method of selecting DNA for resequencing accelerates discovery of subtle DNA variations
7. NIST develops test method for key micromechanical property
8. Scientists discover new method of observing interactions in nanoscale systems
9. Newly Published EPA RCRA Method 6800 Supports AIT Technology
10. Attagenes Breakthrough Transcription Factor Profiling Technology to be Described in Nature Methods
11. Cellular construction methods emulated
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/19/2017)... , April 19, 2017  As a ... Abuse and Heroin Summit ,  Proove┬« Biosciences, Inc. ... analyzing genetics, environmental, and lifestyle factors to accurately ... the University of Southern California (USC), the Interventional ... and Proove publish results showing that Proove Opioid ...
(Date:4/19/2017)... FRANCISCO, Calif. , April 19, 2017 /PRNewswire/ ... VCYT ) today announced that it will report ... of market on Wednesday, May 3, 2017. Following the ... webcast at 4:30 p.m. Eastern Time to discuss the company,s ... live webcast and subsequent replay may be accessed ...
(Date:4/18/2017)... ... April 18, 2017 , ... ... converts conductivity readings to concentration levels and vice-versa. , One of the key ... solution strength in concentration control or monitoring. The principle of this analytical method ...
(Date:4/18/2017)... Austin, Texas (PRWEB) , ... April 18, 2017 , ... ... Miami Research Associates, co-members in the VaxCorps vaccine consortium, were named one of the ... top finalist since the inception of this category; winning the award four times previously, ...
Breaking Biology Technology:
(Date:3/29/2017)...  higi, the health IT company that operates the ... , today announced a Series B investment from ... The new investment and acquisition accelerates higi,s strategy to ... population health activities through the collection and workflow integration ... collects and secures data today on behalf of over ...
(Date:3/27/2017)... ROCKVILLE CENTRE, N.Y. , March 27, 2017 ... by Healthcare Information and Management Systems Society (HIMSS) ... Analytics Outpatient EMR Adoption Model sm . In ... top 12% of U.S. hospitals using an electronic ... recognized CHS for its high level of EMR ...
(Date:3/24/2017)... Research and Markets has announced the addition of the ... Industry Forecast to 2025" report to their offering. ... The Global Biometric Vehicle Access ... 15.1% over the next decade to reach approximately $1,580 million by ... and forecasts for all the given segments on global as well ...
Breaking Biology News(10 mins):