17241
A simple and sensitive spectrophotometric method to the simultaneous determination of Mn ( 2 + ) and Fe ( 3 + ) in foods , vegetable and water sample with the aid of artificial neural networks ( ANNs ) is described .
 Chemical: Mn ( 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: Mn ( 2 + ); Chemical: Fe ( 3 + )