Question

The guideline for maximum concentration of mercury in commercial fish is 0.5 ppm. If a 1600 g fish contains 0.6 mg of mercury, decide whether the fish is safe to be eaten.

Answer 1

1 g contains 1000 mg = 1000 ppm

Concentration of Mercury in fish: 0.6 / 1600 = 0.0004 mg/g = 0.4 ppm

As 0.4 ppm is less than 0.5 ppm, this fish is safe to be eaten.