A simple yet representative method for determining the characteristic time a persistent organic pollutant remains in a multimedia environment is presented. The characteristic time is an important attribute for assessing long-term health and ecological impacts of a chemical. Calculating the characteristic time requires information on decay rates in multiple environmental media as well as the proportion of mass in each environmental medium. We explore the premise that using a steady-state distribution of the mass in the environment provides a means to calculate a representative estimate of the characteristic time while maintaining a simple formulation. Calculating the steady-state mass distribution incorporates the effect of advective transport and nonequilibrium effects resulting from the source terms. Using several chemicals, we calculate and compare the characteristic time in a representative multimedia environment for dynamic, steady-state, and equilibrium multimedia models, and also for a single medium...
[1]
W. Shiu,et al.
Illustrated handbook of physical-chemical properties and environmental fate for organic chemicals. Volume 5: pesticide chemicals.
,
1992
.
[2]
Loszlo Magos.
Book reviewThe evaluation of toxicological data for the protection of public health: Commission of the European Communities. Pp.427. 1977. £19.50
,
1978
.
[3]
Gary F. Bennett,et al.
Pesticide fact handbook : By U.S. Environmental Protection Agency, Noyes Data Corp., Park Ridge, NJ, 1985, ISBN 0-8155-11450, 827 pp., US$96.
,
1990
.
[4]
J. Lamarsh.
Introduction to Nuclear Engineering
,
1975
.