Glossary of Water and Wastewater Terms
A B C D E F G H I J K L M N O P Q R S T U V W Y Z5 random terms from our glossary
nodular (NOD-yoo-lar)
Shaped like a rounded lump, knot, or knob. An irregular enlargement.
titrate (TIE-trate)
A method to determine the composition of a sample by adding a chemical solution of known strength drop by drop to the sample until a certain color change, precipitate, or pH change occurs.
safety data sheet (SDS)
This component of the Globally Harmonized System of Classification and Labeling of Chemicals and OSHA’s Hazard Communication Standard provides comprehensive information about a substance or mixture for use in workplace chemical management, including hazards to people and the environment and safety precautions. The SDS is normally product related and not specific to the workplace. Employers can use SDS information to develop site-specific training programs and procedures for worker protection and environmental compliance.
permissible exposure limit (PEL)
The legal limit in the United States for exposure of a worker to a hazardous substance (such as chemicals, dusts, fumes, mists, gases, or vapors) or agents (such as occupational noise). OSHA sets enforceable permissible exposure limits (PELs) to protect workers against the health effects of excessive exposure. OSHA PELs are based on an 8-hour time-weighted average (TWA) exposure. Permissible exposure limits are listed in the Code of Federal Regulations (CFR) Title 29 Part 1910, Subparts G and Z. Also see time-weighted average.
tremie (TREH-me)
A device used to place concrete or grout under water.
