FIG. 3.

Substrate remaining in soil (■) and ¹⁴CO₂ evolved from soil (•) treated with BTX mixtures. Each component of a mixture was added at 1 μl · g of soil⁻¹ (3 μl · g of soil⁻¹ total). Only a single component of each BTX mixture (the one specified on the figure) was monitored. Benzene was measured in combination with toluene and p-xylene, toluene was measured in combination with benzene and o-xylene, o-xylene was measured in combination with benzene and toluene, and p-xylene was measured in combination with benzene and toluene. Each error bar represents 1 SD of three samples.