Free chlorine in a sample can react with organic compounds to ... Waters with cyanides or sulphides require a sodium hydroxide preservative to be added to ensure that hydrogen cyanide or hydrogen ...

Compounds with a chlorine or bromine moiety (e.g., halothane, isoflurane, chlorofluorocarbons) can deplete the atmospheric ozone layer, resulting in increased ultraviolet radiation reaching the earth.

A winter freeze warning was placed over the majority of Oregon to last through Wednesday morning, with temperatures predicted to drop below zero.