10030
In this study , a method of positive matrix factorization ( PMF ) combined support vector machines ( SVMs ) was adopted to identify possible sources and apportion contributions for trace element pollution in surface sediments from the Jinjiang River , Southeastern China .
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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:
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