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

Table 6

The test results of the optimal process conditions.

Sample serial number	Rate removal of heavy metals (%)
	Pb	Cd	Hg	Cu
1	91.10	93.57	80.11	85.21
2	90.21	95.17	82.19	81.47
3	93.17	92.67	83.57	84.15
4	91.24	92.33	80.37	83.64
5	92.16	91.27	82.87	80.78
6	91.76	93.01	81.22	83.17
Average	91.67	93.00	81.76	83.19
RSD	1.26	1.39	1.97	1.99