セリウム

400615513455

7440-45-1

ce007910 | cerium metal | ce005110 | ce000200 | ceriumingot | nsc 158935 | ce000220 | ce000205 | ce007950 | cerium | ce000210

Ce

140.12

6.67 g/mL at 25 °C(lit.)

3443 °C(lit.)

795 °C(lit.)

Cerite (Sweden), bastnasite (California, New Mexico), monazite (beach sands in Florida, Brazil, India, South Africa).

Cerium resembles aluminum in its pharmacological action as well as in its chemical properties. The insoluble salts such as the oxalates are stated to be nontoxic even in large doses. It is used to prevent vomiting in pregnancy. The average dose is from 0.05 to 0.5 g.The effect on the central nervous system of the rare-earth metals following inhalation may preclude welding operations with these materials to any large extent. Cerium is stated to produce polycythemia but is useless in the treatment of anemia owing to its toxic effects. The salts of cerium increase the blood coagulation rate. See also RARE EARTHS. A strong reducing agent. Moderate fire hazard; ignites spontaneously in air at 150–180°. Moderate explosion hazard in the form of dust when exposed to flame. The metal or its alloys spark with friction. Many alloys are pyrophoric in air. See also IRON DUST. Explosive reaction with zinc. Very exothermic reaction with antimony or bismuth. Ignites when heated in atmospheres of CO2 + N2, Cl2, or Br2. Violent reaction when heated with phosphorus (400°C), silicon (1400°C).

4.1

ハザード記号:

ヨーロッパ標準の危険絵文字、コードと定義

22-23-36/38-36/37/38-20/21/22-11-15-14/15 (R)

3

UN 2031 8 / PG 2