Table 3 Trace metal and glyphosate content in drinking water samples
| Â | Abandoned wells | Serving wells | U | Z# | P value | Surface water | Ro water | Colombo well | Colombo tap | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
Mean | Median | Mean | Median | ||||||||
Al | 2.2 | 1.0 | 2.9 | 2.2 | 117.5 | −0.916 | 0.3596 | 3.5 | <0.1 | 6.7 | 71.6 |
Sb | 3.2 | 0.9 | 4.5 | 2.9 | 127.0 | −0.587 | 0.5570 | 3.4 | 0.1 | 0.3 | 0.5 |
As | 0.8 | 0.4 | 0.3 | 0.3 | 104.5 | −1.381 | 0.1674 | 0.2 | 0.2 | <0.5 | <0.1 |
Cd | 0.04 | 0.0 | 0.04 | 0.0 | 138.0 | −0.247 | 0.8051 | 0.1 | 0.1 | 0.1 | 0.1 |
Cr | 1.0 | 0.6 | 0.5 | 0.0 | 103.0 | −1.495 | 0.1348 | 0.3 | 0.4 | <0.1 | <0.1 |
Co | 0.07 | 0.1 | 0.2 | 0.1 | 118.0 | −0.968 | 0.3329 | 0.1 | <0.1 | 0.1 | 0.2 |
Cu | 1.4 | 1.2 | 1.9 | 1.0 | 107.5 | −1.264 | 0.2063 | 0.4 | 3.5 | 0.3 | 0.4 |
Fe | 90.5 | 76.6 | 45.2 | 40 | 60.0 | −2.898 | 0.0038** | 20.0 | 1.5 | 17.4 | 26.1 |
Pb | 0.5 | 0.1 | 0.2 | 0.1 | 124.0 | −0.791 | 0.4287 | 0.1 | 0.2 | 0.1 | 0.1 |
Mn | 2.8 | 1.1 | 2.0 | 0.3 | 98.5 | −1.573 | 0.1156 | 0.8 | 0.4 | 5.5 | 6.4 |
Mo | 1.5 | 1.4 | 1.1 | 0.8 | 97.5 | −1.609 | 0.1077 | 0.3 | 1.0 | 0.3 | 0.4 |
Ni | 0.8 | 0.7 | 3.1 | 0.6 | 140.0 | −0.139 | 0.8897 | 0.3 | 0.8 | 0.1 | 0.2 |
Se | 0.7 | 0.7 | 0.3 | 0.2 | 65.5 | −2.731 | 0.0063** | 0.4 | 0.3 | <0.1 | <0.1 |
Ag | 0.01 | 0.0 | 0.02 | 0.0 | 133.5 | −0.736 | 0.4615 | <0.1 | 0.1 | <0.1 | 0.1 |
Tl | 0.1 | 0.1 | 0.05 | 0.0 | 129.0 | −0.582 | 0.5603 | 0.1 | 0.1 | <0.1 | <0.1 |
Sn | 0.3 | 0.3 | 0.3 | 0.3 | 143.0 | −0.038 | 0.9696 | 0.3 | 0.2 | 0.3 | 0.3 |
Ti | 0.8 | 0.8 | 0.6 | 0.7 | 85.5 | −2.047 | 0.0406* | 0.2 | 0.3 | 0.3 | 0.3 |
V | 14.4 | 10.5 | 17.4 | 6.3 | 84.5 | −2.053 | 0.0400* | 1.4 | 0.8 | 0.3 | 0.3 |
Zn | 4.3 | 2.3 | 7.7 | 3.4 | 115.0 | −1.001 | 0.3168 | 6.8 | 6.1 | 0.8 | 0.7 |
Gly+ | 3.5 | 3.2 | 0.7 | 0.6 | 15.0 | −4.456 | 0.0000** | 0.05 | ND | ND | ND |