9843
Nitrate , nitrite and ascorbic acid ( vitamin C ) concentrations were determined for spinach ( Spinacia oleracea L . ) over a 24 h period to determine if light intensity ( including dark periods ) at time of harvest impacts concentrations in raw vegetables .
 Chemical: Nitrate; Chemical: nitrite; Chemical: ascorbic acid; Chemical: vitamin C
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Nitrate, nitrite, ascorbic acid, vitamin C 
Answer:
 Chemical: Nitrate; Chemical: nitrite; Chemical: ascorbic acid; Chemical: vitamin C