prov:value
| - Some chemicals such as fluoride, chlorine, mercury, lead, polychlorinated biphenyls, arsenic, methyl tertiary-butyl ether, dimethyl tetrachloroterephthalate, perchlorate, dioxin, hexachlorobenzene, dichloro-diphenyl-trichloroethane, radon, cadmium, uranium, deuterium, and strontium in water are hazardous and these excess chemicals in water are leftover human materials which are present accidentall
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