Land-based sources of pollutants to coastal waters of southern Belize: Comparison of predictive model with empirical data

Alegria, Victor Eduardo (2009) Land-based sources of pollutants to coastal waters of southern Belize: Comparison of predictive model with empirical data. Masters thesis, University of South Florida.

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    Abstract

    A Level III fugacity-type model was applied to southern Belize (Stann Creek and Toledo Districts) to predict which of the pesticides most heavily used in banana and citrus farms are most likely to end up in streams and coastal waters via surface runoff. Concentrations of all target pesticides in coastal waters of southern Belize were then measured during two sampling campaigns (dry season and rainy season) in 2008. Several pesticides were measured in significant levels, including some as far out as waters overlying coral reefs. The presence of these pesticides in the coastal waters indicates that agricultural activities in southern Belize may have a potential impact on coral reefs offshore. Results of the predictive model were compared with the empirical data to determine how well the model works in a tropical region such as southern Belize. Overall, there is considerable agreement between the two, indicating that the model employed herein can be applied to other tropical areas. Concentrations of mercury and lead were also measured in the same study area. Mercury levels were uniform and low, suggesting natural sources. Lead levels varied and are most likely explained by the presence of unregulated and illegal waste dumps near streams in the region. An analysis was carried out to examine government policy on pesticide use. Findings indicate a lack of a coherent governmental policy on the sale and use of pesticides, most likely because vii of too many agencies/ministries being involved and the lack of national standards for these pesticides in the environment.

    Item Type: Thesis (Masters)
    Related URLs:
      Subjects: (F) People and the Environment > (FA) Environmental Health
      (G) Pollution > (GC) Water
      (Z) Other or Unspecified
      Publication Sources: (3) Other Source > (3D) Other or Unspecified
      Date Deposited: 03 Aug 2012 21:20
      Last Modified: 03 Aug 2012 21:20
      URI: http://eprints.uberibz.org/id/eprint/1338

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