The human actions arising from influx of visitors in coastal regions may be associated to public health problems and negative effects to the environment. In this sense, microbiological analysis of water samples were developed on a beach in north Santa Catarina, located in the municipality of Penha. To verify the sea water for contact primary to recreation and to have a monitoring data basis, the considerations made by environmental agency of State of Santa Catarina were analyzed complementarily. The study happened in November of 2014 and January/ March of 2015. The water collection it occurred on eight points along the Penha’s Beach. The points are salty water (sea) and wastewater disposal on the sand. Throughout the study, microbiological contamination was observed due to the presence of Escherichia coli, an important indicator of fecal contamination, in the places where sampling of the water and exposed wastewater at the edge of the beach were performed. The results obtained showed discrepancy in values of E. coli between points and collected periods. Thus, it is suggested the need for a larger number of samples for monitoring water quality, especially at the time with great flow of tourists in order to avoid problems of public health as a water borne diseases. Finally, it is understood that this work can not characterize properly the bathing conditions, due to the short period of study. However, the joint work of environmental agencies and universities may lead to better information regarding bathing conditions at coastal areas available to the public.

Ao utilizar modelagem matemática para determinação de curvas analíticas, equações e coeficientes para parâmetros químicos, tem como objetivo facilitar o trabalho laboratorial. Os parâmetros nitrogênio e fósforo são encontrados das mais diversas formas no meio ambiente. O método empregado na determinação desses parâmetros é o colorimétrico, baseado na Lei de Beer-Lambert. A utilização de amostras padrões serve como um procedimento de comparação, onde se analisa amostras que apresentem concentrações em uma faixa previamente estabelecida. A obtenção das curvas analíticas ocorre pelo método do ajuste de curva linear, cuja equação servirá como referência para determinações futuras de concentrações. Para cada curva, é gerado um coeficiente de correlação linear, o qual indica quão bom é o ajuste realizado. As curvas analíticas obtidas são de extrema importância, atuando como uma ferramenta na determinação das concentrações dos parâmetros.