Selenium powder
GB code numbers 61502
CAS number 7782-49-2
Molecular formula Se
Molecular weight 78.96
Content 99.9
The gray either the garnet powder or the black glass installthe matter, hard and is crisp; Steams steam pressure 0.13kPa (356℃); Melting point 217 ℃; Boiling point 685 ℃; Solubility: Doesnot dissolve Yu Shui, is mellow, dissolves to the sulfuric acid, thenitric acid, the alkali, the carbon bisulfide; Density: Relativedensity (water =1) 4.81; Stability: Stable; The risk markings 15 (isharmful, is far away food); Main use: Uses in the systemsemiconducting material, the luxmeter, the solar battery, therectifier, the red glass
2. To environment influence:
First, health danger
Invasion way: The inspiration, the food enter.
Health danger: The selenium has a stronger irritating quality to theskin mucous membrane. The massive inspiration may cause acutely arepoisoned, appear the nose to fill, to flow the tears, thepharyngalgia, the cough, the eye stabbing pain, the headache,dizziness, are disgusting, vomit and so on the symptom.
The chronicity is poisoned: The long-term contact certain densityselenium, may have the headache, dizziness, is incapable, disgustingvomits, symptom and so on anorexia, diarrhea. Also may have the liverto be big, the liver function exceptionally, the hypotension, theheart movement slow and so on the plant nerve function disorderperformance
Second, the toxicology academic attainments anticipate the environmentbehavior
Toxicity: Is the micro poisonous kind.
Acute toxicity: LD506700mg/kg (big mouse after mouth )
In the environment the selenium compound has -2, +2, +4, +6 four kinds valence state, by +4, +6 prices compound existence is in the majority. In theindustry the commonly used selenium compound has the selenic acid, thesodium selenate, the sodium selenite, hydrogen selenide, the selenium dioxide, the selenyl chloride and so on. Selenium non-toxic, but hydrogen selenide, thealkaline metal selenite and the selenate toxicity are very fierce.
Migration transformation: Selenium in natural water by Se0, Se2-, Se4 +, Se6 + condition existence. In the waste water sometimes has theselenite radical ion (SeO32-), in the slight acidity water is stable, may return to original state under the acidic condition into thefine-grain shape element selenium, the oxygen turns into the selenateradical ion under the alkalescency condition. In the pigment and thedye waste water includes the selenium compound, for example cadmium selenide (CdSe). The negative two prices form selenide is very difficult todissolve, but in the present industry uses the selenium not to bemany, in the water body the selenium pollution is only the partialquestion. In the most situations, the industrial district and the non-industrial district rivers contain the selenium quantity differencenot to be big. In the soil selenium fetters by the solubility verylow selenious acid iron shape in the soil, the general accumulation inis rich iron-center. The rich hard earth is helpful to the seleniumunion and reduces the selenium activeness. Dangerous characteristic: May burn under the high temperature.Serodynamic combustion (decomposition) product: Oxidized selenium. ◆ use: Uses in profession and so on battery, pigment, the semiconductor.
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