caa a22 4500 467902992 CHVBK 20180406152824.0 cr unu---uuuuu 170328e20060601xx s 000 0 eng 10.1007/s10661-006-7980-z doi (NATIONALLICENCE)springer-10.1007/s10661-006-7980-z Spatial and Temporal Trends of Physicochemical Parameters in the Water of the Reconquista River (Buenos Aires, Argentina) [Elektronische Daten] [Patricia Castañé, María Rovedatti, Mirta Topalián, Alfredo Salibián] The Reconquista river is one of the most polluted watercourses in Argentina. More than 3 million people and over 10,000 industries are settled on its basin. The available data show that pollution is mainly related to the discharge of domestic and industrial liquid wastes that are poured into the river almost untreated. At present no site of the river can be characterized as free of pollutants. Samples were taken monthly from 5 sites of the river; some 18-20 physicochemical parameters were determined in each sample. Analyses revealed significant differences in the degree of deterioration between sites. Two of them, close to the source of the river (Cascallares-S1 and Paso del Rey-S2) resulted less polluted than the two points located close to the mouth of the river (San Martin-S4 and Bancalari-S5). The worsening of the water quality in S4-S5 was attributed to the discharges of the Moron stream, a tributary that flows into the main course of the river a complex mixture of non treated waste waters. PCA was used in the ordination of samples (sites, season and physicochemical parameters). In the PCA performed using all variables, the first principal component showed positive correlation with N-NH4 +, conductivity, orthophosphate, BOD5, COD and alkalinity, and negative correlation with DO. The second principal component was positively correlated with pH, temperature and chlorophyll a and negatively with phenols and hardness. In respect to the spatial distribution, the plot of the scores for the first two components of samples taken in each sampling station showed S1 and S2 values displayed farthest at the left side of the X axis with high DO. In contrast, S4 and S5 values stayed at the right side of this axis with high N-NH4 +, conductivity, orthophosphate, BOD5, COD and alkalinity; data of S3 were "intermediate". In order to identify seasonal trends in the concentration of contaminants scores of cases labeled by season were plotted. The line drawn on the ordination plane showed that summer samples tended to converge to the upper right portion of the graph where pollution variables had more importance on the first axis, and along the second axis with high correlation with pH, temperature and chlorophyll a. Winter scores were settled in the left lower part of the plot with minor contribution of pollution parameters and more importance of DO on the first axis. Samples of autumn and spring did not fit a clear cut pattern. Springer Science + Business Media, Inc., 2006 aquatic pollution nationallicence baseline nationallicence peri urban river nationallicence physicochemical parameters nationallicence principal component analysis nationallicence Reconquista river (Argentina) nationallicence Castañé Patricia Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut Rovedatti María LIBIQUIMA, Universidad Nacional del Comahue, Neuquén, Argentina aut Topalián Mirta Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut Salibián Alfredo Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut Environmental Monitoring and Assessment Kluwer Academic Publishers 117/1-3(2006-06-01), 135-144 0167-6369 117:1-3<135 2006 117 10661 https://doi.org/10.1007/s10661-006-7980-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10661-006-7980-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Castañé Patricia Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut NATIONALLICENCE 700 1- Rovedatti María LIBIQUIMA, Universidad Nacional del Comahue, Neuquén, Argentina aut NATIONALLICENCE 700 1- Topalián Mirta Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut NATIONALLICENCE 700 1- Salibián Alfredo Programa de Ecofisiología Aplicada, Departamento de Ciencias Básicas, Universidad Nacional de Luján, Casilla de Correo 221, B6700ZBA, Luján, Argentina aut NATIONALLICENCE 773 0- Environmental Monitoring and Assessment Kluwer Academic Publishers 117/1-3(2006-06-01), 135-144 0167-6369 117:1-3<135 2006 117 10661 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer