9362
Specifically , we used a combination of in situ and ex situ characterization techniques to examine the effects of varying the Fe ( III ) injection rates and cooling methods on the hematite and 6 - line ferrihydrite nanoparticle size , isoelectric point , mineral phase , and aggregation .
 Fe ( III ), hematite, ferrihydrite
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Fe ( III ), hematite, ferrihydrite