arsenic, chromium, tritium, fluoride, nitrate, tetrachlorethylene, carbon tetrachloride, perchlorate, contaminants, radon, mercury, phosphorous, dioxin, radioactive, strontium, coliform bacteria, ppb, cesium, dioxane, benzene, chloramine, vinyl chloride, groundwater, americium, chlorine, hydrofluoric acid, manganese, beryllium, hydrogen sulfide, iodine, barium, orthophosphate, radiation, chlorides, bromate, sodium fluoride, neutron radiation, radioactivity, pentachlorophenol, radionuclide, phosphorus, isotope, cobalt, methylene chloride, chlorination, fluorine, impurities, trichloroethane, coliform, turbidity, selenium, cadmium, neptunium, sludge, carbon disulfide, coal tar, radioactive material, solvents, contamination, toxaphene, biphenyl, tremolite, salts, potassium permanganate, hexavalent, polonium, pollutants, thallium, hazardous waste, sulfate, sulfur, reverse osmosis, dieldrin, sodium hypochlorite, wastewater, arsenide, californium, carcinogen, effluent, toxins, chlordane, tellurium, iodide, cyanide, caesium, toxicity, mercuric chloride, water softener, etchant, water, leaching, chelating, hydrogen sulphide, methylene blue, methyl chloride, heptachlor, polychlorinated biphenyl, ozonation, furan, uranium, sodium chloride, gamma radiation, plutonium, petroleum, nickel, potash, present, thorium, ca, helium, hydrogen, lithium, petrol, silicon, vanadium, zinc, alkali, reagent, boric, carbonate, buffer, surfactant, 60, bromine, chromic, g, vitamin, 0, 192, 210, 238

atomic number 86, carnotite, curie, curietherapy, madame curie, marie curie, marya sklodowska, pitchblende, radium therapy, radon, rn, uraninite

metal, metallic element

atomic number 88, ra