TABLE 3.

Physicochemical characterization of sampling sites

Sampling sitepH (mean ± SD)Mean Eh ± SD (mV)Mean metal concn ± SD (ppm)
SO42−FeCuZn
RT12.2 ± 0.2563 ± 6327,191 ± 15720,231 ± 2322 ± 225 ± 1
RT23.1 ± 0.3421 ± 5412,061 ± 66632 ± 3NDa22 ± 0.4
RT34.7 ± 0.8246 ± 301,853 ± 9334 ± 1ND24 ± 0.3
RT42.3 ± 0.3513 ± 3315,636 ± 829,680 ± 1010 ± 0.527 ± 1
RT52.6 ± 0.1490 ± 305,412 ± 382,298 ± 42 ± 0.125 ± 0.3
RT62.2 ± 0.2460 ± 42b
RT72.1 ± 0.2538 ± 553,756 ± 311,837 ± 427 ± 0.497 ± 1
RT82.1 ± 0.2420 ± 1
RT92.4 ± 0.1494 ± 434,836 ± 393,018 ± 5100 ± 1340 ± 1
RT102.3 ± 0.3608 ± 372,665 ± 28853 ± 345 ± 0.5139 ± 1
  • a ND, not detected.

  • b —, not measured.