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670×103 ppm
160×103 ppm
93×103 ppm
72×103 ppm
12×103 ppm
10×103 ppm
9×103 ppm
8×103 ppm
7×103 ppm
630 ppm
360 ppm to 820 ppm
170 ppm to 710 ppm
200 ppm
18 ppm to 310 ppm
14 ppm to 200 ppm
40 ppm
17 ppm to 52 ppm
16 ppm to 30 ppm
16 ppm
1.5 ppm to 27 ppm
0.3 ppm to 12 ppm
0.04 ppm to 10 ppm
1.2 ppm to 6.8 ppm
3.3 ppm
0.68 ppm to 4.4 ppm
0.05 ppm to 4.7 ppm
0.9 ppm to 3.1 ppm
0.4 ppm to 3.5 ppm
0.9 ppm to 2.6 ppm
0.6 ppm to 1.8 ppm
1 ppm
0.15 ppm to 1.5 ppm
0.007 ppm to 1.5 ppm
0.04 ppm to 1 ppm
0.035 ppm to 0.31 ppm
0.15 ppm
0.005 ppm to 0.26 ppm
0.026 ppm to 0.22 ppm
0.066 ppm to 0.09 ppm
0.07 ppm
0.04 ppm to 0.07 ppm
0.028 ppm to 0.049 ppm
0.016 ppm to 0.044 ppm
0.03 ppm
0.009 ppm to 0.024 ppm
0.014 ppm
0.013 ppm
0.004 ppm
<0.0007 ppm
0.0002 ppm
6×10-9 ppm
Bowen, H. J. M. Environmental Chemistry of the Elements. London: Academic Press, Inc., 1979.
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