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Posts Tagged ‘Pesticide’

New and Revised Clean Water Act Methods Proposed

Thursday, September 23rd, 2010

New and Revised Clean Water Act Methods ProposedIn August 2010 the EPA issued a notice proposing new and revised analytical methods to be used under the Clean Water Act (CWA).

The proposed rule, entitled “Guidelines Establishing Test Procedures for the Analysis of Pollutants Under the Clean Water Act; Analysis and Sampling Procedures”, will affect numerous EPA Methods, ASTM Methods, Standard Methods, and alternative test methods.

EPA methods:

Read more about the proposed CWA Methods…

EPA Proposes New Permit Requirements for Pesticide Discharges

Wednesday, September 1st, 2010

New Permit Requirements for Pesticide Discharges

In June 2010, the U.S. Environmental Protection Agency (EPA) released a draft of its National Pollutant Discharge Elimination System (NPDES) permit. Through the permitting process, the EPA is seeking to decrease the amount of pesticides discharged into waterways. The new permit, also known as the Pesticides General Permit (PGP), was developed in response to a 2009 court decision, which ruled that pesticides can be classified as pollutants under the Clean Water Act.

The EPA’s PGP authorizes the controlled release of the following substances into U.S. waterways:

Read more about EPA’s Proposed New Permit Requirements for Pesticide Discharges…

Organochlorine Pesticide Analysis using HRGC/MS/MS

Tuesday, March 3rd, 2009

 

Organochlorine pesticides (OCPs) have a long history of use in the United States and around the world. Although the production and use of many OCPs has been banned since the 1970s, the compounds are extremely persistent in the environment and are known for accumulating in sediments, plants and animals. OCPs have a wide range of both acute and chronic health effects, including cancer, neurological damage, and birth defects. Many OCPs are also suspected as endocrine disruptors.1

Due to the need to monitor levels of OCPs, significant research and development has taken place over the last 40 years. This has culminated in two primary methods used by the Environmental Protection Agency (EPA) to regulate the transport and fate of OCPs; EPA Method 1699 and EPA Method 8081.

EPA Method 1699, isotope dilution and high-resolution mass spectrometry, is considered the ultimate in pesticide analysis relative to sensitivity and selectivity, but can be cost prohibitive.

EPA Method 8081 is a gas chromatography method that employs electron capture as a means of detection. To achieve some level of selectivity, the method is run in dual column mode with two dissimilar analytical columns. It has been well documented that the use of ECD can lead to false positives or high biases in the results generated by this method.2

 

This lack of selectivity is especially apparent when polychlorinated biphenyls (PCB) are present in the sample.

 
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