25349
The background concentration of Se in soil has a significant positive correlation with longevity index , while Ba and Ni have a significant negative correlation with longevity indexes .
 Chemical: Se; Chemical: Ba; 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: Se; Chemical: Ba; Chemical: Ni