Estudo da qualidade da água da bacia hidrográfica do Rio Igarapé-açu (município de Igarapé-açu/Pa)

Abstract

The River Basin Igarapé - Açu is located in the city of Igarapé - Açu in the northeast state of Pará, 110 km from the capital of Pará, Belém. Was studied a stretch of bayou Pau Cheiroso, wich empties into spring River Igarapé - Açu. Samples were collected at 18 sampling points along River Basin Igarapé -Açu including its tributaries direct, two collection periods. The points were distributed at 11 sites along the river Igarapé - Açu, 4 points from their affluent and 3 points in bayou Pau Cheiroso. The objective was conduct an analysis water quality of River Basin Igarapé - Açu, for comparison purposes, the physicochemical parameters, based on Resolusion CONAMA 357/2005. The parameters analyzed in the field were: Temperature, PH, Electric Conductivity, STD e Dissolved Oxygen. Samples physical parameters were analyzed a Probe Multiparameter. The samples were filtered direct the laboratory for analysis of chemical parameters: nitrite, nitrate, ammonia, phosphate and silica. All samples of the chemical parameters were analyzed in the apparatus Photometer Multiparameter. The observed values of physical parameter as temperature, dissolved oxygen and conductivity, were recorded at higher elevations 27,82°C, 7,14mg/L and 62uS/cm, respectively. For chemical parameters the highest values for nitrite, nitrate, ammonia and phosphate, were , 5mg/L, 13,73mg/L, 0,41mg/L and 1 mg/L, respectively. Based standard CONAMA, the River Basin Igarapé - Açu has suffered impact, deserving special attention by the government of the city.