7519
Contaminant discharges of selected metals into the sea were calculated in about 13 , 977 . 6 kg year ( - 1 ) showing that this river should account as one of the main contribution sources of metals to the Tyrrhenian Sea .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None