17463
The retained Fe ( II ) was eluted with hydrochloric acid and subsequently reacted to 2 , 4 , 6 - tri ( 2 ' - pyridyl ) - 1 , 3 , 5 - triazine ( TPTZ ) then measured at 593 nm .
 Chemical: Fe ( II ); Chemical: hydrochloric acid; Chemical: 2 , 4 , 6 - tri ( 2 ' - pyridyl ) - 1 , 3 , 5 - triazine; Chemical: TPTZ
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: Fe ( II ); Chemical: hydrochloric acid; Chemical: 2 , 4 , 6 - tri ( 2 ' - pyridyl ) - 1 , 3 , 5 - triazine; Chemical: TPTZ