Made available in DSpace on 2014-12-17T15:01:20Z (GMT). No. of bitstreams: 1 AnitaML.pdf: 8838564 bytes, checksum: 65c8b2d71a3bd376ee943cbc1f350499 (MD5) Previous issue date: 2004-09-02 / Environmental pollution has become a subject of public interest throughout the world. Not only have developed countries been affected by environmental problems but also the developing nations have started to suffer from the serious impacts of pollution. Within this context it is necessary to collect simplified environmental data to assist in the management of water resources by the appropriate authorities. These data are obtained through an environmental index that allows a space-time comparison of points distributed in the same aquatic body, or between different water bodies, for physico-chemical and bacteriological parameters. The aim of this present study was to determine the environmental status of the Lagoa de Baixo at Guamar?/RN, where a production unit of PETROBRAS RN/CE is located. For this purpose the Water Quality Index (WQI) was used in both an add and multiply form, the Trophic State Index (TSI) and the Environmental Quality Quotient (EQQ), as well as determining the concentrations of metals. The average values obtained for the WQI, in its two forms were 68,67 and 62,76 respectively which were inside the good qualification. According to the TSI the lagoon showed characteristics of a middle trophic state, and an impact level of regular as determined by the EQQ / A polui??o ambiental tornou-se assunto de interesse p?blico em todo o mundo. N?o apenas os pa?ses desenvolvidos v?m sendo afetados pelos problemas ambientais; tamb?m as na??es em desenvolvimento come?am a sofrer os graves impactos da polui??o. Dentro deste contexto ? necess?ria a obten??o de dados simplificados para viabilizar a??es no gerenciamento dos recursos h?dricos pelas autoridades. Esses dados s?o obtidos atrav?s dos ?ndices ambientais, que permitem uma compara??o espa?o-temporal de pontos distribu?dos num mesmo corpo aqu?tico ou entre distintas cole??es h?dricas, nos quais est?o inseridos par?metros f?sico-qu?micos e bacteriol?gicos. O objetivo deste trabalho ? realizar um diagn?stico das condi??es ambientais da Lagoa de Baixo em Guamar?/RN, onde se localiza a unidade de produ??o RN/CE da PETROBRAS, contemplando os ?ndices de Qualidade de ?gua Aditivo e Multiplicativo, ?ndice de Estado Tr?fico e Quociente de Qualidade Ambiental, al?m da avalia??o das concentra??es de metais, com vistas ? caracteriza??o ambiental. Os valores m?dios obtidos para os IQA s, aditivo e multiplicativo foram de 68,67 e 62,76 respectivamente, estando dentro da qualifica??o boa . De acordo IET a lagoa apresentou caracter?sticas variando entre oligotr?fica a mesotr?fica, com n?vel de impacto regular apontado pelo QQA