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The National Institute for Occupational Safety and Health (NIOSH) has set a recommended exposure limit (REL) of 5 mg/m 3 over an 8-hour workday and a short-term limit of 10 mg/m 3. At levels of 2500 mg/m 3, tantalum dust is immediately dangerous to life and health. [90]
Metal toxicity or metal poisoning is the toxic effect of certain metals in certain forms and doses on life.Some metals are toxic when they form poisonous soluble compounds. . Certain metals have no biological role, i.e. are not essential minerals, or are toxic when in a certain for
The density implied by the adjective "heavy" has almost no biological consequences and pure metals are rarely the biologically active substance. [10] This characterization has been echoed by numerous reviews. [11] [12] [4] The most widely used toxicology textbook, Casarett and Doull’s toxicology [13] uses "toxic metal" not "heavy metals". [10]
1-10 minutes, or up to 18 hours Visual disturbance, eye pain, pinpointing of the pupils, runny nose, chest tightness, breathing difficulty, cough, severe nasal congestion, nausea, diarrhea, vomiting, and twitching, VX Gas: colorless Odor: none 1-10 minutes, or up to 42 hours Constricted pupils, visual disturbance, eye pain, runny nose,
Nickel is the most common contact allergen worldwide (of people with contact dermatitis, 11.4% in Europe, 8.8–25.7% in China, and 17.5% in North America are allergic to nickel). [ 1 ] Nickel allergy, and contact allergies more generally, can develop when people are any age, but they are most likely to develop in early adulthood.
Tantalum pentoxide, also known as tantalum(V) oxide, is the inorganic compound with the formula Ta 2 O 5. It is a white solid that is insoluble in all solvents but is attacked by strong bases and hydrofluoric acid. Ta 2 O 5 is an inert material with a high refractive index and low absorption (i.e. colourless), which makes it useful for coatings ...
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Natural tantalum (73 Ta) consists of two stable isotopes: 181 Ta (99.988%) and 180m Ta (0.012%). There are also 35 known artificial radioisotopes, the longest-lived of which are 179 Ta with a half-life of 1.82 years, 182 Ta with a half-life of 114.43 days, 183 Ta with a half-life of 5.1 days, and 177 Ta with a half-life of 56.56 hours.