There is no rule of thumb of percentage increase per minute of boiling. However, you could estimate that the final concentration would be inversely proportional to the volume decrease in water. For example, if a pan contained 2 quarts of water and boiled down to 1 quart of water remaining, the concentration of a contaminant such as arsenic could potentially double.
When you boil water which has arsenic in it, how much does it raise the level of the arsenic content per minute of boiling? What would be the percentage increase?
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