Evaluative Calculations for Benzene

The Level II calculation includes the half-lives of 17 h in air, 170 h in water, 550 h in soil and 1700 h in sediment. No reaction is included for suspended sediment or fish. The input of 1000 kg/h results in an overall fugacity of 6 x 10 6 Pa, which is about 20% of the Level I value. The concentrations and amounts in each medium are thus about 20% of the Level I values. The relative mass distribution is identical to Level I. The primary loss mechanism is reaction in air, which accounts for 802 kg/h or 80.2% of the input. Most of the remainder is lost by advective outflow. The water, soil and sediment loss processes are unimportant largely because so little of the benzene is present in these media, but also 

Water (2) 1.794E-03 5.638E-08 4.404E-06 4.404E-06 8.808E+02 8.808E-01 

Soil (3) 4.764E-03 1.497E-07 1.169E-05 4.871 E-06 1.052E+02 1.052E-01 

Bottom sediment (4) 9.527E-03 2.994E-07 2.338E-05 9.743E-06 2.338E+00 2.338E-03 

Suspended sediment (5) 2.977E-02 9.355E-07 7.307E-05 4.871 E-05 7.307E-02 7.307E-05 

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