9366
As ( V ) adsorption experiments revealed that 6 - line ferrihydrite and hematite exist as a linear combination of two separate phases .
 As ( V ), ferrihydrite, hematite
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 As ( V ), ferrihydrite, hematite