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reagent
a chemical substance used to cause a reaction for the purpose of chemical analysis.
 
reduction
chemical reaction in which an atom or molecule gains an electron; decrease in positive valence; addition of hydrogen to a molecule.
 
reduction treatment
the opposite of oxidation treatment wherein a reductant is used to lower the valence state of a pollutant to a less toxic form; e.g. the use of SO2 to reduce Cr6+ to Cr3+ in an acidic solution.
 
residual chlorine
chlorine remaining in water or wastewater at the end of specified contact period as combined or free chlorine.
 
resistance
the opposition which a device or material offers to the flow of current; measured in ohms.
 
resistor
a component of an electrical circuit intended to offer resistance to electrical current flow.
 

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