9781
The adsorption capacity of SCB - HFO for As ( V ) was found to be 22 . 1 mg / g under optimum conditions of pH 4 , contact time 3h and temperature 22 degrees C .
 HFO, As ( V )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 HFO, As ( V )