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Table 2 Hardness and related parameters in drinking water samples

From: Drinking well water and occupational exposure to Herbicides is associated with chronic kidney disease, in Padavi-Sripura, Sri Lanka

  mg/L μg/L mg/L μs/cm
Well type Na K Ca Mg Ba Sr Hardness Condutivity
Abandoned wells in Sripura (n = 18)
Mean 74.8 0.9 51.8 28.0 150.7 572.4 243.6 877.2
Median 57.1 0.8 53.2 29.6 142.3 519.0 234.5 623.0
Serving wells in Sripura (n = 16)
Mean 51.9 0.6 29.0 13.0 89.4 269.1 125.9 465.0
Median 38.6 0.7 28.5 11.6 83.9 265.0 121.0 509.5
U 77.5 97.0 26.5 24.5 64.0 31.0 6.0 44.0
Z# −2.295 −1.629 −4.054 −4.124 −2.760 −3.899 −4.762 −3.450
P Value .0217* .1034 .0001** .0000** 0.0058** .0001** .0000** .0006**
Surface water 5.85 0.45 10.6 1.15 10.4 46 31.2 79.5
RO water 3.1 0.2 0.6 0.6 2.1 4.6 4.0 22.0
Colombo well 2.6 0.7 6.8 0.8 16.4 13.1 20.2 49
Colombo main 2.5 0.7 6.8 0.8 16.5 14.5 20.0 49
  1. *P < 0.05, **P < 0.01, # two sample Wilcoxan rank-sum (Mann–Whitney) test.