Microsoft Word - WaterChemistry

261 Metalloid Section Drinking water contaminants that can cause health effects after continuous long-term exposure at levels gr ...

262 The six elements commonly recognized as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. They are ...

263 The criterion that metalloids are difficult to unambiguously classify one way or the other is a key tenet. In contrast, elem ...

264  Describe potential adverse health effects and populations at risk;  Describe actions you are taking to correct the situat ...

265 Near Metalloids............................... The concept of a class of elements intermediate between metals and nonmetals ...

266 Categorization and Periodic Table Territory Metalloids are generally regarded as a third category of chemical elements, alon ...

267 With some irregularities, atoms therefore become smaller, ionization energy increases, and there is a gradual change in char ...

268 Some of these elements are actually necessary for humans in minute amounts (cobalt, copper, chromium, manganese, nickel) whi ...

269 Radioactive metals have both radiological toxicity and chemical toxicity. Metals in an oxidation state abnormal to the body ...

270 Trace Elements with Toxicity  Chromium as hexavalent Cr(VI)  Nickel – nickel salts are carcinogenic  Copper – copper toxi ...

271 Health Significance of Metals in the Environment The metallic elements can be categorized into two groups. The heavy metals ...

272 ...

273 Antimony - Inorganic Contaminant 0.006 mg/L MCL Metalloid See Antimony in IOC Section for more information Antimony is a tox ...

274 Antimony is in the nitrogen group (group 15) and has an electronegativity of 2.05. As expected by periodic trends, it is mor ...

275 Astatine- Nonmetal or a Metalloid Astatine may be a nonmetal or a metalloid. It is ordinarily classified as a nonmetal, but ...

276 ...

277 Arsenic- Inorganic Contaminant 0.010 mg/L MCL Metalloid See Arsenic in IOC Section for more information Arsenic is a chemica ...

278 Chronic oral exposure has resulted in gastrointestinal effects, anemia, peripheral neuropathy, skin lesions, hyperpigmentati ...

279 Boron - Metalloid Boron is a chemical element with chemical symbol B and atomic number 5. Because boron is produced entirely ...

280 In 1777, boric acid was recognized in the hot springs (soffioni) near Florence, Italy, and became known as sal sedativum, wi ...