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360×103 ppm
285×103 ppm
170×103 ppm
52×103 ppm
43×103 ppm
62 ppm to 71×103 ppm
10×103 ppm
2×103 ppm to 12×103 ppm
2100 ppm
500 ppm to 2400 ppm
700 ppm to 1800 ppm
900 ppm
3 ppm to 380 ppm
75 ppm to 170 ppm
36 ppm to 140 ppm
0.2 ppm to 100 ppm
3 ppm to 70 ppm
21 ppm
17 ppm
3.6 ppm to 30 ppm
0.1 ppm to 33 ppm
4 ppm to 27 ppm
1 ppm to 26 ppm
6.7 ppm
1 ppm to 9 ppm
0.001 ppm to 6 ppm
2.7 ppm
0.1 ppm to 5 ppm
1.1 ppm to 3.3 ppm
1.8 ppm
1.4 ppm
<0.7 ppm
0.45 ppm
0.01 ppm to 0.6 ppm
0.01 ppm to 0.44 ppm
<0.2 ppm
<0.1 ppm
0.07 ppm
<0.07 ppm
0.08 ppm to 1.6 ppm
0.00016 ppm to 0.07 ppm
0.013 ppm to 0.052 ppm
0.01 ppm to 0.04 ppm
0.016 ppm
0.002 ppm to 0.012 ppm
0.0035 ppm
0.003 ppm
0.002 ppm
0.00025 ppm
4×10-9 ppm
Bowen, H. J. M. Environmental Chemistry of the Elements. London: Academic Press, Inc., 1979.
Emsley, John. The Elements, 3rd edition. Oxford: Oxford University Press, 1998.
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