Environmental Protection Agenc

CHEMblST " The CHEMLlS l Pile contains chemical substances on national inventories, registered by the US Environmental Protection Agency (EPA), TTie dala in GPdHMLIS l arc from 1979 to the present, there arc more than 228 380 records (September, 2002). CHHMLlS l is updated weekly with more than 50 addilions to eUsling records or new subslances. 

Dating approximately from the creation of the U S Environmental Protection Agency (EPA) in 1970... 

Since 1979 the use of 24 5 T has been regu lated in the United States It is likely that the United States Environmental Protection Agency will classify some dioxins as known and others as probable human carcinogens and recommend further controls be placed on processes that produce them It appears from decreasing dioxin levels in some soils that exist mg regulations are having some effect ... 

Chart showing hierarchical relationship among a technique, methods using that technique, and procedures and protocols for one method. (Abbreviations APHA = American Public Health Association, ASTM = American Society for Testing Materials, EPA = Environmental Protection Agency)... 

The Analysis of Trihalomethanes in Drinking Water by Liquid Extraction US Environmental Protection Agency, Environmental Monitoring and Support Laboratory, Cincinnati, OH, 9 Sept. 1977. 

A good example of a prescriptive approach to quality assessment is the protocol outlined in Figure 15.2, published by the Environmental Protection Agency (EPA) for laboratories involved in monitoring studies of water and wastewater. Independent samples A and B are collected simultaneously at the sample site. Sample A is split into two equal-volume samples, and labeled Ai and A2. Sample B is also split into two equal-volume samples, one of which, Bsf, is spiked with a known amount of analyte. A field blank. Dp, also is spiked with the same amount of analyte. All five samples (Ai, A2, B, Bsf, and Dp) are preserved if necessary and transported to the laboratory for analysis. 

Example of a prescriptive approach to quality assurance. Adapted from Environmental Monitoring and Support Laboratory, U.S. Environmental Protection Agency, "Handbook for Analytical Quality Control in Water and Wastewater Laboratories," March 1979. 

The U.S. Environmental Protection Agency publishes sets of Series Methods that describe procedures for detecting and estimating the quantity of environmentally hazardous substances. There are strict requirements for accuracy, reproducibility, and for calibration of mass spectrometers. 

The Environmental Protection Agency (EPA) authorizes control over hazardous and potentially hazardous substances and validates appropriate methods of analysis, many of which require GC/MS. 

The Environmental Protection Agency lays down strict guidelines for the analysis of a range of environmentally hazardous substances. Many of the analyses utilize GC/MS. 

EPA. Environmental Protection Agency (U.S. agency responsible for many methods of analysis used by mass spectrometrists)... 

This article has been reviewed by the Office of Pollution Prevention and Toxics, U.S. Environmental Protection Agency, and approved for publication. Approval does not... 

Procedures for Emission Inventory Preparation, Vol. 1 -4, Pub. No. EPA 450-4-81-026A-E, U.S. Environmental Protection Agency, Research Triangle Park,N.C, 1981. 

Compilation of yiirPollution Emission Factors, Pub. No. AP-42, 5th ed., U.S. Environmental Protection Agency, Research Triangle Park, N.C., 1989. Compilation of A.ir Pollution Emission Factors, Vol 2. Mobile Sources, Pub. No. AP-42, 5th ed., U.S. Environmental Protection Agency, Research Triangle Park, N.C., 1989. 

All blends of these oxygenated compounds are subject to ASTM D 439 volatility liinits except ethanol. Contact the EPA for current waivers and detailed requirements, U.S. Environmental Protection Agency, Eield Operations and Support Division (EN-397E), 401 M Street, S.W., Washington, D.C. 20460. 

Office of Mobile Sources, Analysis of the Economic and Environmental Effects of Methanol as an Automotive Euel, U.S. Environmental Protection Agency, Ann Arbor, Mich., Sept. 1989. 

J. W. Patterson and R. A. Minear, State of the Art for the Inorganic Chemicals Industy Commercial Explosives, 600/2-74-009b, Environmental Protection Agency, Washington, D.C., 1975. 

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