7972
This might be ascribed to the elevated levels of Cr ( +/- 200 to 1 , 166 mu g g ( - 1 ) ) and Ni ( +/- 100 to 316 mu g g ( - 1 ) ) in all of the sites .
 Chemical: Cr; Chemical: Ni
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: Cr; Chemical: Ni