Chromium is an ultratrace metal in the human body. The typical concentration is 5.0 mg in 70.0 kg of body mass. This concentration can be expressed as ________
A) 0.071 ppm or 71 pp
B) 71 ppm or 0.071 ppb.
C) 14 ppm or 14,000 ppb.
D) 0.71 ppm or 710 ppb.
E) 5.0 ppm or 500 ppb.
Correct Answer:
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