| As | Arsenic |
Atomic number : 33
Relative atomic mass (12C = 12.0000) : 74.92159 |
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| P H Y S I C A L D A T A | |
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Group 15 non-metal Density / kg m-3 : 5780 (  ); 4700 ( ) [293 K] |
Melting point / K : 1090 (alpha, under pressure) Boiling point / K : 889 (sublimes) |
| D I S C O V E R Y | |
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Probably first isolated by Albertus Magnus (1193 - 1280). |
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| G E O L O G I C A L D A T A | |
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Abundances Sun (relative to H = 1 × 1012) : n.a. Earth's crust / p.p.m. : 1.5 Atmosphere / p.p.m. (volume) : trace Residence time / years : 90 000 Classification : As(III) scavenged, As(V) recycled Oxidation state : III but mainly V |
Seawater / p.p.m. : Atlantic surface : 1.45 × 10-3 Atlantic deep : 1.53 × 10-3 Pacific surface : 1.45 × 10-3 Pacific deep : 1.75 × 10-3 |
| B I O L O G I C A L D A T A | |
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Level in humans Blood / mg dm-3 : 0.0017 - 0.09 Bone / p.p.m. : 0.08 - 1.6 Liver / p.p.m. : 0.023 - 1.61 Muscle / p.p.m. : 0.009 - 0.65 |
Daily dietary intake : 0.04 - 1.4 mg Total mass of element in average (70 kg) person : 7 mg (fluctuates over range 0.5 - 1.5 mg depending on diet) |
