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Table 2 Cation and metal ion concentrations of the untreated water samples and the corresponding SODIS treated water samples collected after 6 and 8 hrs compared to the recommended drinking water guidelines

From: Comparative analysis of solar pasteurization versus solar disinfection for the treatment of harvested rainwater

Metal Untreated After 6 hrs (70 °C) After 8 hrs (63 °C) Untreated After 6 hrs (89 °C) After 8 hrs (86 °C) SANS 241 DWAF AWDG
Ti (μg/L) 0.51 0.53 0.32 0.09 0.12 0.13 - - -
Al (μg/L) 14.35 20.29 11.82 1.19 3.77 5.61 300 150 200
V (μg/L) 0.21 0.20 0.25 0.07 0.14 0.16 200 1000 -
Cr (μg/L) 0.06 0.04 0.06 0.12 0.12 0.13 100 50 50
Mn (μg/L) 3.31 3.24 3.09 1.09 15.30 13.59 100 50 500
Fe (μg/L) 571.26 729.71 645.39 112.60 1015.32 505.35 200 100 300
Co (μg/L) 0.03 0.04 0.03 0.05 0.14 0.13 500 - -
Ni (μg/L) 0.26 0.25 0.15 0.54 0.46 0.44 150 - 20
Cu (μg/L) 3.09 2.35 9.72 1.00 1.10 1.50 1000 1000 2000
Zn (μg/L) 1.46 5.29 4.18 4.50 5.12 2.52 5000 3000 3000
As (μg/L) 0.45 0.54 0.50 0.38 0.64 0.52 10 10 10
Mo (μg/L) <0.005 <0.005 <0.005 0.02 0.01 0.03 - - 50
Cd (μg/L) <0.004 <0.004 <0.004 0.00 0.00 0.00 5 5 2
Ba (μg/L) 3.79 3.75 2.93 98.05 99.33 89.68 - - 2000
Pb (μg/L) 0.46 0.65 0.53 <0.006 0.10 0.16 20 10 10
Ca (mg/L) 2.86 2.84 2.88 4.83 4.83 4.83 150 32 -
K (mg/L) 0.35 0.38 0.40 0.49 0.49 0.47 50 50 -
Mg (mg/L) 0.35 0.36 0.37 0.45 0.44 0.46 70 30 -
Na (mg/L) 2.01 2.05 2.08 2.06 2.00 2.09 200 100 180
P (mg/L) 0.10 0.14 0.15 0.04 0.08 0.14 - - -