7522
The animals were exposed to 25 or 100 mu g Cu g ( - 1 ) dry LUFA 2 . 2 soil at nominal pH ( CaCl2 ) 4 . 5 , 5 . 5 , or 6 . 5 during 14 days after which they were transferred to clean soil for 14 days elimination .
 Chemical: Cu; Chemical: CaCl2
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: Cu; Chemical: CaCl2