Graduation Year

2002

Document Type

Thesis

Degree

M.S.

Degree Granting Department

Chemistry

Major Professor

Poor, Noreen

Co-Major Professor

Malik, Abdul

Keywords

spatial concentrations, diffusion coefficient for ammonia, diffusivity, area sampling, tampa bay estuary program

Abstract

The purposes of this research were to determine the efficacy of using the Ogawaâ passive sampling device (PSD) to measure ammonia and to identify significant ammonia sources adjacent to Hillsborough and Tampa Bay. Ninety-four samplers were deployed over a 180-km2 area for two weeks in October 2001. Within the area sampled were located suburbs, an urban center, major highways, port activities, fertilizer manufacturing, wastewater treatment, coal-combustion power plants, warehousing and dairy farming. The sampled locations were arranged in a triangular grid pattern spaced 1.5 km apart. The pattern was designed to locate circular hot spots with a minimum radius of 0.75 km. The minimum, maximum, mean, and median ammonia concentrations were 0.06, 15, 2.0, and 1.5 mg/m3, respectively, and the estimated precision was 16%. Hot spots identified from kriged concentration data coincided with inventoried ammonia sources.

The relative bias and precision of the PSD based on collocation with an annular denuder system were (plus or minus) 30 % and 20 %.

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