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Table 2

Chemical elements in water before and after the first washing of shungite

Element (MDL; QL)WaterSH-1xCom-1x
Ni (1.2; 4), μg/L <0.9 660 ± 60 175 ± 16 
Cu (0.3; 0.9), μg/L 0.3 36 ± 5 35 ± 5 
Pb (0.4; 2), μg/L 0.4 1.1 1.0 
Zn (10; 30), μg/L 13 153 ± 29 36 ± 7 
Cd (0.02; 0.05), μg/L <0.007 3.5 ± 0.6 1.0 ± 0.2 
Cr (0.2; 0.5), μg/L <0.2 0.3 0.3 
As (0.2; 0.6), μg/L <0.2 0.4 0.3 
Al (1; 3), mg/L <1 <1 <1 
Ca (0.2; 0.6), mg/L 69 ± 10 76 ± 11 72 ± 10 
Mg (0.1; 0.4), mg/L 26 ± 2 27 ± 2 26 ± 2 
Fe (0.04; 0.15), mg/L <0.04 <0.04 <0.04 
Na (0.2; 0.5), mg/L 5.4 ± 0.3 5.9 ± 0.4 5.7 ± 0.3 
K (0.1; 0.4), mg/L 1.0 ± 0.1 1.1 ± 0.1 1.3 ± 0.1 
Element (MDL; QL)WaterSH-1xCom-1x
Ni (1.2; 4), μg/L <0.9 660 ± 60 175 ± 16 
Cu (0.3; 0.9), μg/L 0.3 36 ± 5 35 ± 5 
Pb (0.4; 2), μg/L 0.4 1.1 1.0 
Zn (10; 30), μg/L 13 153 ± 29 36 ± 7 
Cd (0.02; 0.05), μg/L <0.007 3.5 ± 0.6 1.0 ± 0.2 
Cr (0.2; 0.5), μg/L <0.2 0.3 0.3 
As (0.2; 0.6), μg/L <0.2 0.4 0.3 
Al (1; 3), mg/L <1 <1 <1 
Ca (0.2; 0.6), mg/L 69 ± 10 76 ± 11 72 ± 10 
Mg (0.1; 0.4), mg/L 26 ± 2 27 ± 2 26 ± 2 
Fe (0.04; 0.15), mg/L <0.04 <0.04 <0.04 
Na (0.2; 0.5), mg/L 5.4 ± 0.3 5.9 ± 0.4 5.7 ± 0.3 
K (0.1; 0.4), mg/L 1.0 ± 0.1 1.1 ± 0.1 1.3 ± 0.1 
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