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Explain parts per million in brief. |
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Answer» Solution :When a solute is present in trace QUANTITIES, it is convenient to express CONCENTRATION in parts PER million (ppm) Parts per million `= ("Number of parts of the component")/("Total number of parts of all components of the solution")xx10^(6)` As in the case of percentage, concentration in parts per million can also be expressed as mass to mass, volume to volume and mass to volume. A litre of seas water (which weights 1030 g) contains about `6xx10^(-3)` g of dissolved OXYGEN `(O_(2))`. Such a small concentration is also expressed as 5.8 g per `10^(6)` g (5.8 ppm) of seawater. The concentration of pollutants in water or atmosphere is often expresed in terms of `MU g mL^(-1)` or ppm. |
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