Alkyl Thiourea Functionalised Silica for the Effective Removal of Heavy Metals from Acanthopanax senticosus Extract

Table 3

The test results of the optimal process conditions.

Sample serial number	Rate removal of heavy metals (%)
	Pb	Cd	Hg	Cu
1	83.31	89.26	82.89	85.17
2	83.29	91.47	83.03	83.12
3	84.27	90.12	80.28	82.26
4	85.34	90.91	81.79	84.53
5	83.27	89.25	82.51	82.64
6	83.43	91.33	80.01	83.39
Average	82.12	89.21	81.27	82.47
RSD	1.27	1.49	1.78	1.34