6387
Limits of detection were found to be 0 . 15 ng mL - (1) for Pb and 0 . 75 ng mL - (1) for Ni .
 Chemical: Pb; 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: Pb; Chemical: Ni