Extractant property

Extractant

Deionized water

Rainwater

Groundwater

Electrical conductivity (µS∙cm−1)

0.9 (<0.01)aa

4.1 (<0.01)b

296 (0.6)c

pH

8.22 (0.01)a

5.24 (0.02)b

7.64 (0.02)c

Arsenic (mg∙L1)

<0.005b

<0.005b

<0.005b

Chromium (mg∙L1)

<0.001b

<0.001b

<0.001b

Selenium (mg∙L1)

<0.005b

<0.005b

<0.005b