Benz(a)pyrene was detected in the ether-insoluble fraction of acidic water on being heated to 100 and 300-450 degrees C, while heating of total acidic water and settled tar at 300-450 degrees C did not cause any changes in the content of this compound. The obtained results suggest that the ether-soluble fraction of acidic water contains compounds which promote benz(a)pyrene breakdown or inhibit its synthesis from products of timber pyrolysis.
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