Abundances In this table values are given in units of ppb (parts per billion; 1 billion = 109), both in terms of weight and in terms of numbers of atoms. Values for abundances are difficult to determine with much certainty, so all values should be treated with some caution, especially so for the less common elements. Local concentrations of any element can vary from those given here by orders of magnitude.
Abundance
ppb by weight
ppb by atoms
Universe
8
0.1
Sun
no data
no data
Meteorite (carbonaceous)
1800
460
Crustal rocks
2100
580
Sea water
2.3
0.19
Stream
1
0.01
Human
50
4
Notes
Arsenic is found as the free element occasionally, but is found more normally in a number of minerals. Mispickel (arsenopyrite, FeSAs) is the most common mineral. Locations include France, Germany, Italy, Romania, Siberia, and North America.
