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However, the concentrations of some limited elements should be considered during the exploitation of high Se-rich mineral water in the NDM. Cd, Ni, Tl, Fe, and Al concentrations correlated significantly with Se content (r= 0.73, 0.71, 0.51, 0.36, and 0.36; P < 0.01) (Table 4). Of the eight Se-rich fissure water samples (Se >10 μg/L), the Ni content of two samples (22.78, 22.95 μg/L) and the Tl content of five samples (0.11–0.2 μg/L) were slightly higher than the CNS guidelines (Ni < 20 μg/L, Tl < 0.1 μg/L) (Figure 4), suggesting that the concentrations of these elements in potable water should be taken into account.

Table 4

Pearson correlation coefficients between Se and Sr, Cd, Ni, Tl, Fe, Al contents in water, Lan'gao area

 SrCdNiTlFeAl
Se 0.067 0.731* 0.706* 0.514* 0.356* 0.358* 
Sr  −0.178 −0.045 0.077 0.062 −0.051 
Cd   0.869* 0.571* 0.171 0.219 
Ni    0.794* 0.220 0.239 
Tl     0.099 0.088 
Fe      0.973* 
 SrCdNiTlFeAl
Se 0.067 0.731* 0.706* 0.514* 0.356* 0.358* 
Sr  −0.178 −0.045 0.077 0.062 −0.051 
Cd   0.869* 0.571* 0.171 0.219 
Ni    0.794* 0.220 0.239 
Tl     0.099 0.088 
Fe      0.973* 

*P < 0.01, significant correlation.

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