The step of washing the aqueous suspension may be carried out by washing with {HEAD ~ an aqueous solution} containing {TAIL ~ an organic surfactant} 
containing
The step of washing the aqueous suspension may be carried out by washing with { HEAD ~ an aqueous solution } containing { TAIL ~ an organic surfactant }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL