18656
The sensor shows good selectivity to Na ( + ) , K ( + ) , Ca ( 2 + ) , Cu ( 2 + ) , and Fe ( 3 + ) ions and offers a rapid response compared to conventional techniques .
 Chemical: Na ( + ); Chemical: K ( + ); Chemical: Ca ( 2 + ); Chemical: Cu ( 2 + ); Chemical: Fe ( 3 + )
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: Na ( + ); Chemical: K ( + ); Chemical: Ca ( 2 + ); Chemical: Cu ( 2 + ); Chemical: Fe ( 3 + )