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La méthode d'appréciation est directement inspirée du système modulaire graduée dédié aux nutriments, elle juge si les seuils à atteindre pour satisfaire aux objectifs écologiques dans les eaux superficielles sont atteints.\n\nElle se détermine en mesurant la teneur dissoute de six métaux : cadmium (Cd), chrome (Cr), cuivre (Cu), nickel (Ni), plomb (Pb) et zinc (Zn).\n \nLa catégorisation de la valeur annuelle, calculée à partir des concentrations mesurées, se distingue en 5 classes de qualité de très bonne à mauvaise.\n\nPour chaque station, une appréciation générale de la qualité vis-à-vis des métaux est déterminée d'après le principe de l'élément déclassant.\n\nValeur Cadmium (µg/L):\n< 0,025➜ Très bon état\n[0.025 - 0.050[ ➜ Bon état\n[0.050 - 0.075[ ➜ Etat moyen\n[0.075 - 0.100[ ➜ Etat médiocre\n≥ 0.100 ➜ Etat mauvais\n\nValeur Chrome (µg/L):\n< 1.00➜ Très bon état\n[1.00 : 2.00[ ➜ Bon état\n[2.00 - 3.00[ ➜ Etat moyen\n[3.00 - 4.00[ ➜ Etat médiocre\n≥ 4.00 ➜ Etat mauvais\n\nValeur Cuivre (µg/L):\n< 1.00➜ Très bon état\n[1.00 : 2.00[ ➜ Bon état\n[2.00 - 3.00[ ➜ Etat moyen\n[3.00 - 4.00[ ➜ Etat médiocre\n≥ 4.00 ➜ Etat mauvais\n\nValeur Nickel (µg/L):\n< 2.50➜ Très bon état\n[2.50 : 5.00[ ➜ Bon état\n[5.00 - 7.50[ ➜ Etat moyen\n[7.50 - 10.0[ ➜ Etat médiocre\n≥ 10.0 ➜ Etat mauvais\n\n\nValeur Plomb (µg/L):\n< 0.50➜ Très bon état\n[0.50 : 1.00[ ➜ Bon état\n[1.00 - 1.50[ ➜ Etat moyen\n[1.50 - 2.00[ ➜ Etat médiocre\n≥ 2.00 ➜ Etat mauvais\n\n\nValeur Zinc (µg/L):\n< 2.50➜ Très bon état\n[2.50 : 5.00[ ➜ Bon état\n[5.00 - 7.50[ ➜ Etat moyen\n[7.50 - 10.0[ ➜ Etat médiocre\n> 10.0 ➜ Etat mauvais\n\nLa valeur -99 correspond à un élément Non analysé\nLa valeur -10 correspond à un élément Non détecté", "copyrightText": "", "editFieldsInfo": null, "ownershipBasedAccessControlForFeatures": null, "syncCanReturnChanges": false, "relationships": [], "isDataVersioned": false, "isDataArchived": false, "infoInEstimates": [ "extent", "count" ], "isDataBranchVersioned": false, 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