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540×103 ppm
230×103 ppm
115×103 ppm
96×103 ppm
74×103 ppm
30×103 ppm
7×103 ppm
5.3×103 ppm
5.1×103 ppm
4.6×103 ppm
2300 ppm
260 ppm
210 ppm
180 ppm
170 ppm
150 ppm
83 ppm
20 ppm
9.8 ppm
7.9 ppm
5.5 ppm
4 ppm
0.31 ppm
0.1 ppm
0.016 ppm
Bowen, H. J. M. Environmental Chemistry of the Elements. London: Academic Press, Inc., 1979.
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