title: Evaluation of the quality of the water in El Hondo natural park located in the east of Spain.
abstract: The purpose of the present work was to evaluate the quality of the water in El Hondo Park, an important wetland located in the east of Spain (province of Alicante) and included on the Ramsar List. The influence of the input of pollutants was assessed over a 14-month period in order to propose remedial action. Three different sources of waters were studied: irrigation water, brackish water and reservoir water. The irrigation water was found to have a high value of conductivity with high concentrations of Cl-, SO(4)2-, Na+ and K+ due to the influence of the brackish water. The concentration of organic matter given as CODT (total chemical oxygen demand) was found to be in the range of 70-600 mg/L of CODT, which was comparable to low-middle strength wastewater. A high concentration of Chlorophyll (a) was found in samples of reservoir water and the eutrophication of this water was thus observed. A high linear relationship was found among CODT, CODF (filtered COD) and BOD5; among electrical conductivity (E.C.), Cl-, SO4(-2), Na+, K+, Ca2+ and Mg2+ and among pH, CO3H- and CO(3)2- in all the samples evaluated. Taking this fact into consideration, a simplified water quality index (WQI) was calculated. Using this parameter, the quality of the water from different sources and its variation during the period evaluated was determined to be at a maximum during the months of December to February, which coincided with the period of high precipitations and low temperature. The highest values of this parameter were found in the samples corresponding to the reservoir water while the lowest values were found in the samples of the brackish water. By determination of the WQI, the influence of the brackish water on the quality of water for irrigation and reservoir waters was confirmed.
authors.affiliation: Centro de Ciencias Medioambientales (CSIC), Madrid, Spain.
authors.forename: M F
authors.initials: MF
authors.lastname: Colmenarejo
authors.forename: E
authors.initials: E
authors.lastname: Sánchez
authors.forename: R
authors.initials: R
authors.lastname: Borja
authors.forename: L
authors.initials: L
authors.lastname: Travieso
authors.forename: S
authors.initials: S
authors.lastname: Cirujano
authors.forename: J L
authors.initials: JL
authors.lastname: Echevarrias
authors.forename: A
authors.initials: A
authors.lastname: Rubio
authors.forename: M G
authors.initials: MG
authors.lastname: González
mesh_terms: D002734:Chlorophyll / Q000032:analysis; D000077194:Chlorophyll A; D004553:Electric Conductivity; D004784:Environmental Monitoring / Q000706:statistics & numerical data*; D005618:Fresh Water / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D013030:Spain; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D010100:Oxygen; D000077194:Chlorophyll A