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Table 3

Concentration of various metals in water after shungite treatment (elements exceeding MAC are underlined)

ElementSH
Com
3rd day5th day3rd day5th day
Ni, μg/L 880 ± 80 58 ± 6 1700 ± 150 60 ± 6 
Cu, μg/L 4.3 ± 0.6 <0.3 33 ± 4 0.8 
Pb, μg/L 211 ± 17 <0.5 5.0 ± 0.4 1.1 
Zn, μg/L 129 ± 25 <10 900 ± 170 <10 
Cd, μg/L 5.0 ± 0.9 0.022 11 ± 2 0.16 ± 0.04 
Cr, μg/L 0.25 <0.2 <0.2 <0.2 
As, μg/L 0.6 ± 0.1 0.4 0.3 <0.2 
Al, mg/L <1 ND <1 ND 
Ca, mg/L 76 ± 11 ND 81 ± 11 ND 
Mg, mg/L 31 ± 2 ND 38 ± 3 ND 
Fe, mg/L <0.04 ND <0.04 ND 
Na, mg/L 6.1 ± 0.4 ND 6.1 ± 0.4 ND 
K, mg/L 2.5 ± 0.3 ND 2.0 ± 0.2 ND 
ElementSH
Com
3rd day5th day3rd day5th day
Ni, μg/L 880 ± 80 58 ± 6 1700 ± 150 60 ± 6 
Cu, μg/L 4.3 ± 0.6 <0.3 33 ± 4 0.8 
Pb, μg/L 211 ± 17 <0.5 5.0 ± 0.4 1.1 
Zn, μg/L 129 ± 25 <10 900 ± 170 <10 
Cd, μg/L 5.0 ± 0.9 0.022 11 ± 2 0.16 ± 0.04 
Cr, μg/L 0.25 <0.2 <0.2 <0.2 
As, μg/L 0.6 ± 0.1 0.4 0.3 <0.2 
Al, mg/L <1 ND <1 ND 
Ca, mg/L 76 ± 11 ND 81 ± 11 ND 
Mg, mg/L 31 ± 2 ND 38 ± 3 ND 
Fe, mg/L <0.04 ND <0.04 ND 
Na, mg/L 6.1 ± 0.4 ND 6.1 ± 0.4 ND 
K, mg/L 2.5 ± 0.3 ND 2.0 ± 0.2 ND 

ND, not determined.

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