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Posts Tagged ‘gas’

Qualitative Aspects of Environmental Testing for Organic Parameters – An Overlooked Facet of Data Quality

Monday, May 27th, 2013

By Lee Wolf, Regulatory Affairs Manager, ALS Environmental – USA

One may look at classical wet chemistry and the pioneering chemists and wonder. What were they really doing? What were they looking for? Discovering tests for isolating and identifying chemical components was the purpose. One cannot envision that accuracy and precision, or detection limits were of much concern. Fast-forward to the infancy of environmental testing and one can still find the identification of chemical components of utmost importance in developing methods and technology.

Currently, and for recent years, the focus of environmental measurements has predominately been on quantitative aspects. Significant emphasis is now put on detection limits, quantitation limits, accuracy and precision, and uncertainty of measurements. That is, an emphasis on sensitivity over selectivity, both in terms of data quality and data usability. Yet fundamentally, the targeted component(s) of a sample must first be accurately identified before accurate quantitation can occur.

In this paper, the shift in focus from selectivity to sensitivity in the analysis of organic compounds will be discussed and potentially overlooked qualitative data quality considerations examined. Examples of the reliance on standard methodologies and how they can lead to qualitative errors is examined, and how the need for a strong understanding of method selectivity and the use of qualitative tools is important.

Read more about Qualitative Aspects of Environmental Testing…

Vapor Intrusion Investigations: Air Sampling Tips for Meeting Data Quality Objectives

Monday, September 26th, 2011

N. Dagnillo1, L. Hill2, A. Fortune3, A. Smith4, and S. Thompson2
1Trihydro Corporation, 3001 E. Pershing Blvd, Suite 115, Cheyenne, WY 82007
2Trihydro Corporation, 1537 Riverside Ave., Suite 101, Fort Collins, CO 80524
3Columbia Analytical Services, Inc., 2655 Park Center Drive, Suite A, Simi Valley, CA 93065
4Trihydro Corporation, 9460 Calle Milano, Atascadero, CA 93422

Vapor intrusion is a fate and transport process characterized by the upward movement of volatile chemicals from subsurface contamination (e.g., buried waste, contaminated groundwater) into overlying buildings. The potential for adverse human health effects from exposure to indoor air vapors has motivated private, state, and federal entities to develop guidance documents and protocols specific to the collection and analysis of soil vapor data.

Read more about Vapor Intrusion Investigations…

EPA Set to Regulate Greenhouse Gas Emissions

Monday, July 26th, 2010

by Brian Lewis, Ph. D

EPA Set to Regulate GHG Emissions

The regulation of greenhouse gases (GHG) has had a contentious history and continues to be a topic of much debate. The debated topics range from what agency should be in charge of GHG regulations to whether GHG needs to be regulated at all.

On June 10, the U.S. Senate voted 53-47 against a resolution of disapproval that would have stripped the U.S. Environmental Protection Agency (EPA) of the authority to regulate GHGs under the Clean Air Act.1-3 The resolution’s defeat paved the way for the EPA to regulate GHG emissions from both new automobiles and stationary sources. The EPA has now enacted rules that would require large-scale GHG producers to acquire permits.

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Nitrogen Dioxide Standard Released by EPA

Monday, April 19th, 2010

Nitrogen-Dioxide-Public-Health EPA released a new National Ambient Air Quality Standard (NAAQS) for nitrogen dioxide (NO2) in January. This new one-hour standard is aimed to protect public health from peak short-term exposures, especially along busy city streets and highways where NO2 exposure is the most likely. According to the EPA, NO2 exposure has been linked to impaired lung function and increased respiratory infections, especially in people with asthma.

NO2 is one of a group of highly reactive gasses. It forms quickly from emissions from cars, trucks, buses, power plants, and off-road equipment. In addition, NO2 contributes to the development of ground-level ozone and fine particle pollution.

Read more about the nitrogen dioxide standard…

Air Emissions from Industrial Diesel Engines now Regulated by EPA

Wednesday, February 24th, 2010

Industrial Diesel EngineThe EPA aims to reduce air emissions from certain stationary diesel engines and issued their first standards on February 17, 2010. The rule will help reduce formaldehyde, benzene, acrolein and other toxic air pollutants from diesel powered stationary reciprocating internal combustion engines (RICE), also known as compression ignition (CI) engines. The toxic air pollutants, also referred to as hazardous air pollutants or air toxics, are suspected of causing cancer and other serious health effects as well as environmental damage.

EPA estimates that the rule will reduce annual toxic air emissions by 1,000 tons, particle pollution by 2,800 tons, carbon monoxide emissions by 14,000 tons, and organic compound emissions by 27,000 tons when fully implemented in 2013.

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