21712
Pb concentrations in vegetable and fruit samples interested varied between 20 +/- 2 and 160 +/- 12 ng / g , and the highest level of Pb was found to be in green pepper taken from 1000 m away from refinery .
 Chemical: Pb; Chemical: Pb
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: Pb; Chemical: Pb