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In the groundwater samples, the element pairs Cd–Al, Co–Mn, Li–Na, Cd–Co, Co–Ni, Cd–Ni, Ni–Al, Mn–Al, Al–Co, Mn–Ni, and Mg–Sr exhibited exceptionally strong correlation coefficients (Cc >0.90), Li–Ca exhibited strong positive correlation coefficients (0.90 > Cc > 0.70), and both U–Fe and NO3–Mo exhibited weak negative correlation coefficients (Cc < −0.3), as shown in Table 2. Due to the negative correlation in the study area, U and Mo values frequently decreased in samples in which Fe and NO3 values increased. In contrast, in samples in which the concentration of each element of the element pairs displaying an exceptionally strong correlation was high, the other element was similarly high (Table 2) (Figures 3 and 4).

Table 2

Correlation coefficients between the element pairs of the groundwater samples (the full color version of this figure is available in the online version of this paper, at http://dx.doi.org/10.2166/wh.2016.290)

 
 

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