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Bioreduction also changed the redox chemistry of site groundwater , altering the mobility of several other redox - sensitive elements present in the subsurface , including iron , sulfur , and arsenic .
 Chemical: iron; Chemical: sulfur; Chemical: arsenic
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: iron; Chemical: sulfur; Chemical: arsenic