17460
Determination of total iron in food samples after flow injection preconcentration on polyurethane foam functionalized with N , N - bis ( salicylidene ) - 1 , 3 - propanediamine .
 Chemical: iron; Chemical: polyurethane; Chemical: N , N - bis ( salicylidene ) - 1 , 3 - propanediamine
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: iron; Chemical: polyurethane; Chemical: N , N - bis ( salicylidene ) - 1 , 3 - propanediamine