Introduction This dictionary contains terms used in the fields of environmental engineering and environmental science, and the definitions provided relate to their use in an envi ronmental context only The commercial terms represent company brand names or trademarks, and have been italicized to differentiate them from the technical terms in general usage Whenever appropriate, the use of TM or has been included following the name of the entry, although terms may be registered trademarks even though they do not include either symbol. It is also possible that some of the entries listed as trademarks may not be registered or properly used by the manufacturers listed in connection with them Brand names and trademarks often evolve and take different forms variati n the use of capitalization, hyphens, or symbols often occur over time. The repre sentation of the words included in this book reflects the latest version seen in use and are assumed to be the preferred form. Commercial acronyms are included if they are registered trademarks or com- monly used abbreviations of company names. Nonregistered product model numbers and trademarks that are the same as the name of a company are not always included Many definitions were extrapolated from stories, advertisements, or product bro- chures and were not directly corroborated by the company listed as being responsible The company name included in the definition of a commercial term usually represents the company that manufactures that particular product or process. In some cases, the listed company may only market, distribute, or license the product. In several instances. the same brand has been listed more than once to describe different products or processes from different companies. The author is unaware of any dispute involving these cases and is simply reporting that the companies identified have used the term for the product described. In some cases, the term may be dormant, obsolete, or no longer available from the company listed Company addresses, phone numbers, and e-mail addresses listed in the Manu- facturer's Directory were confirmed over a period of several years. Some contact information may have changed, especially with the recent telephone area code hanges in many parts of the U.S. Readers are cautioned that an incorrect phone number, address, or e-mail address does not mean that a company is no longer in business There are a few cases where a company whose name is listed in a definition is not included in the Manufacturers Directory. If current contact information for a company could not be located, the out-of-date information was not included Terms have been arranged alphabetically using current word processing softwareIntroduction This dictionary contains terms used in the fields of environmental engineering and environmental science, and the definitions provided relate to their use in an envi￾ronmental context only. The commercial terms represent company brand names or trademarks, and have been italicized to differentiate them from the technical terms in general usage. Whenever appropriate, the use of ™ or ® has been included following the name of the entry, although terms may be registered trademarks even though they do not include either symbol. It is also possible that some of the entries listed as trademarks may not be registered or properly used by the manufacturers listed in connection with them. Brand names and trademarks often evolve and take different forms. Variations in the use of capitalization, hyphens, or symbols often occur over time. The repre￾sentation of the words included in this book reflects the latest version seen in use and are assumed to be the preferred form. Commercial acronyms are included if they are registered trademarks or com￾monly used abbreviations of company names. Nonregistered product model numbers and trademarks that are the same as the name of a company are not always included. Many definitions were extrapolated from stories, advertisements, or product bro￾chures and were not directly corroborated by the company listed as being responsible for the term. The company name included in the definition of a commercial term usually represents the company that manufactures that particular product or process. In some cases, the listed company may only market, distribute, or license the product. In several instances, the same brand name has been listed more than once to describe different products or processes from different companies. The author is unaware of any dispute involving these cases and is simply reporting that the companies identified have used the term for the product described. In some cases, the term may be dormant, obsolete, or no longer available from the company listed. Company addresses, phone numbers, and e-mail addresses listed in the Manu￾facturer’s Directory were confirmed over a period of several years. Some contact information may have changed, especially with the recent telephone area code changes in many parts of the U.S. Readers are cautioned that an incorrect phone number, address, or e-mail address does not mean that a company is no longer in business. There are a few cases where a company whose name is listed in a definition is not included in the Manufacturer’s Directory. If current contact information for a company could not be located, the out-of-date information was not included. Terms have been arranged alphabetically using current word processing software