1. Experimental parameters: (a) the content of NH 3 �H 2 O in eluent, 20% (v/v); adsorption duration, 60.0 min; desorption time, 30.0 min; sample pH value and ionic strength did not be adjusted; the spiked content for each SCs was 200 ?g/L; (b) the content of H 2 O in eluent;content of NH 3 �H 2 O in eluent (b), adsorption time (c), desorption time (d), pH value (e) and content of NaCl (w/v)