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CDC -NIOSH Pocket Guide W emical Hazards - Selenium Page I of 3 <br /> Centers for Disease Control and Prevention <br /> Your OnOne S for Credible Health Information <br /> September 2005 <br /> NIOSH Publication Number 2005-149 <br /> Search the Pocket Guide <br /> em <br /> Enter search terms separated by spaces. <br /> ......................................................................................-........................................................................................I................................................................................................................................................................................. <br /> Selenium <br /> ......................................................................... ............................................................................................................................................................................................................................................................................... <br /> Synonyms&Trade Names Elemental selenium, Selenium alloy <br /> CAS No. 7782-49-2 RTECS No. VS7700000 DOT ID&Guide 2658 1-52 V <br /> (powder) <br /> Formula Se Conversion IDLH 1 Mg/M3 (as Se) <br /> See: 77824()2 <br /> Exposure Limits Measurement Methods <br /> NIOSH REL *: TWA 0.2 Mg/M3 [*Note: The REL also applies to NIOSH Z-joo'it , <br /> other selenium compounds (as Se) except Selenium 23-0-1 t ,Z1023-t <br /> hexafluoridej 91-0-2t , S190 (11-7); <br /> OSHA ID121 <br /> OSHA PEL *: TWA 0.2 Mg/M3 [*Note: The PEL also applies to d? <br /> other selenium compounds (as Se) except Selenium See: NMAM or OSHA <br /> Methods <br /> hexafluorideI <br /> j §9 <br /> Physical Description Amorphous or crystalline, red to gray solid. [Note: Occurs as an impurity in <br /> most sulfide ores.] <br /> mw: 79.0 BP: 12650F MLT: 392'F Sol: Insoluble vp: o mmHg ip: NA <br /> (approx) <br /> F <br /> Sp.Gr: 4.28--]Fl-p- NA UEL: NA LEL: <br /> [Combustible Solid <br /> Incompatibilities&Reactivities Acids, strong oxidizers, chromium trioxide,potassium bromate, <br /> cadmium <br /> Exposure Routes inhalation, ingestion, skin and/or eye contact <br /> symptoms irritation eyes, skin, nose, throat; visual disturbance; headache; chills,fever; <br /> dyspnea(breathing difficulty),bronchitis; metallic taste, garlic breath, gastrointestinal <br /> disturbance; dermatitis; eye, skin burns; in animals: anemia; liver necrosis, cirrhosis; <br /> http://www.cdc.gov/niosh/npg/npgd0550.html 6/21/2010 <br />