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T

Thiosulfate

Used to remove chlorine from solution or as a titrant for determination of dissolved oxygen by the Winkler method.

Total Solids

All of the solids in the water, including dissolved, suspended, and settleable components.

Toxicity

A relative measure of the ability of a chemical to be toxic. Usually refers to the ability of a substance to kill or cause an adverse effect. High toxicity means that small amounts are capable of causing death or ill health.

Toxin

A particular class of poisons, to which the body may respond by the production of antitoxins.

Turbidity

Presence of suspended or colloidal matter or planktonic organisms that reduces light penetration of water.