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. 2017 Sep 11;18:4. doi: 10.1186/s12932-017-0042-3

Table 3.

Summary of key water quality parameters classified by water type

Parameter Blank Fresh water pond Rice paddies Rain water Shrimp ponds Tidal channel Oct. Tidal channel May Tube well
Number n 4 44 18 3 18 9 14 81
Avg. 1 σ Avg. 1 σ Avg. 1 σ Avg. 1 σ Avg. 1 σ Avg. 1 σ Avg. 1 σ Avg. 1 σ
Eh (mV) 273 126 276 77 173 68 325 162 246 78 279 141 69 97
pH 8.2 0.6 8.2 0.7 7.3 1.2 8.1 0.4 7.8 0.8 7.4 0.4 6.9 0.4
Salinity (ppt) 1.02 0.69 0.91 0.55 0.02 0.02 14.76 3.91 0.43 0.26 15.14 4.48 3.64 2.00
Geom. mean As (μg/L) −2.22 −2.0 0.3 −2.3 0.4 −1.8 0.4 −2.4 0.4 −1.8 0.4 −1.4 0.6
Geom. mean S (mg/L) −0.63 0.67 1.6 0.3 1.4 0.4 −0.4 0.3 2.7 0.2 1.0 0.3 2.8 0.1 0.7 0.8
Geom. mean DOC (mg/L) 0.59 0.18 1.0 0.2 0.8 0.1 0.2 0.1 1.2 0.3 0.8 0.2 0.8 0.2 1.4 0.2
>10 μg/L As 41% 22% 0% 78% 11% 71% 83%
>50 μg/L As 2% 0% 0% 11% 0% 7% 47%
>2 mS/cm 36% 28% 0% 100% 11% 100% 100%