Role Played by Basic Hydrolysis in the Validity of Acid Herbicide Data: Recommendations for Future Preparation of Herbicide Performance Evaluation Standards

Article Abstract:

The EPA designed Water Supply[WS] 41 herbicide performance evaluation ampule to test if labs were using basic hydrolysis in their sample preparations. The inclusion of butyl esther and an acid form of 2,4-dichloropheonxy acetic acid was part of the test. There were two results: first, many labs did not pass the test indicating they do not hydrolyze before testing, secondly, an in-house study resulted in a recognition that acid and esther concentrations had changed since the time of manufacture, also explaining test results. Recommendations include the demonstration that a performance material is stable by testing before distribution and periodically while being held. To prevent transestherification a reformulation is given.

Testing Laboratories, Chemical Testing Labs, Statistical Data Included, Services industry, Service industries, Chemical laboratories, Basset, Margarita V., Pepich, Barry V., Munch, David J., IT Corporation

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Use of EPA analytical methods: survey results

Article Abstract:

There are many similarities and differences between the 500 and 600 series of analytical methods used by the Environmental Protection Agency (EPA). One of the findings of a study on the possible revision or elimination of some of these methods was that a usage survey of the methods was necessary. A survey on the usage of these EPA methods between Aug 1991 and Oct 1991 revealed that the five leading analytical techniques came from the 600 series. Method 602, 624, 625 and 608 accounted for 53% of all of the methods used.

Air, water, & solid waste management, Experimental design, Research design

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Development and validation of the new EPA microwave-assisted leach method 3051A

Article Abstract:

An evaluation of the superiority of the EPA's microwave assisted leach Method 3051A over the open vessel Method 3050B showed that the superiority of the Method 3051A is in the reproducibility of the leach results which stems from the precise control exercised over the extraction temperature. The superiority of the Method 3051A is also evident in the improved recoveries effected by the addition of HCl.

Research and Development in the Physical, Engineering, and Life Sciences, Ecological Sciences, Measurement, Environmental sciences, Leaching, Environmental chemistry

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