ICP Water Quality standard 5 - 31 elements - Ca 2000mg/l ; Mg 400mg/l ; Na 100mg/l ; K 100mg/l ; P 100mg/l ; S 400mg/l ; Si 200mg/l ; Al 1mg/l ; Ag 1mg/l ; As 2mg/l ; B 10mg/l ; Ba 1mg/l ; Be 0.4mg/l ; Bi 2mg/l ; Cd 0.1mg/l ; Co 0.4mg/l ; Cr 0.4mg/l ; Cu 1mg/l ; Fe 2mg/l ; Li 10mg/l ; Mn 0.4mg/l ; Mo 1mg/l ; Ni 1mg/l ; Pb 1mg/l ; Sb 2mg/l ; Se 2mg/l ; Sr 1mg/l ; Ti 0.4mg/l ; Tl 2mg/l ; V 1mg/l ; Zn 2mg/l in HNO3 5%