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These thioarsenic species demonstrate a strong correlation between arsenic release and sulfide concentrations in groundwater , and their formation may explain the elevated total arsenic concentrations .
 Chemical: thioarsenic; Chemical: arsenic; Chemical: sulfide; 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: thioarsenic; Chemical: arsenic; Chemical: sulfide; Chemical: arsenic