3171
Polyphosphates are direct food additives and they are used to treat municipal drinking water , but depending upon the concentration and duration of exposure these substances can induce chemical burns .
 Chemical: Polyphosphates
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: Polyphosphates