Crude oil was chemically-dispersed with Corexit® 9500 into Corpus Christi Bay water and monitored over time via GC/MS. Three different concentrations of chemically-dispersed oil were monitored over time to assess biodegradation. The rate coefficients for \"total target PAH\" (including predominately naphthalene, phenanthrene, dibenzothiophene, and their alkylated homologs) were consistent for each of the three concentrations. Naphthalene degraded more rapidly under the low dispersed oil loading. This was possibly caused by detection limit interference with accurately detecting the rate because the values were near or below detection by day 3. The bulk concentration of the oil in the water column was not a factor controlling the biodegradation rate coefficient and supported the first order approximation. Partitioning of compounds between the two phases, particles size distribution, and the competency of the microbial culture, temperature, and nutrients likely controlled the biodegradation rates. This is an abstract of a paper presented at the 25th Arctic and Marine Oilspill Program Technical Seminar (Calgary, Alberta 6/11-13/2002).