Desalination of Hamipterus tianshanensis fossil by electrokinetic method: evaluation for treatment of clay-rich sandstone

Heritage Science

Table 2 Experimental conditions for the desalination experiments

Poultice used	Stone number (size)^a	Initial current (mA)^b	Duration (days)	Remarks
paper pulp	No. 1 (5/6/6)^a	10	15	Poultice replaced every 3 days
CKS 121	No. 4 (6/7/7)	10	15	Poultice replaced every 3 days

^aNumbers within the parentheses mean the samples size. For example, No. 1 (5/6/6) means that this stone segment (No. 1) is about 5 cm long, 6 cm thick and 6 cm high
^bThe DC power supply was set to supply a constant current of 10 mA. Thus, the initial current was 10 mA. Since the increasing resistance during the experiments, the current could no longer maintain at 10 mA and began to decrease at a constant voltage of 20 V