Hydrochemical Characteristics and Formation Mechanism of Strontium-Rich Groundwater in Shijiazhuang, North China Plain

Table 1

Mathematical statistics of strontium in shallow and deep groundwater.

The concentration of Sr	Shallow aquifer	Deep aquifer
Mean value	1.023	0.771
Median	1.001	0.747
Mode	1.092	0.460
Standard deviation	0.368	0.326
Variance	0.136	0.128
Range	1.546	1.608
Min	0.396	0.229
Max	1.942	1.837