21707
In order to determine Pb and Cd , slotted tube atom trap ( STAT ) was used to increase the sensitivity in atomic absorption spectrophotometry .
 Chemical: Pb; Chemical: Cd
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: Cd