Table 4 Validity test results of the linear regression models between the dissolved concentration of metal (as dependent variable) and the DGT labile concentration (as independent variable), Eq. (2) shown in Fig. 4
Normality | Normality | Homoscedasticity | Homoscedasticity | p-value | R2 | N | |
|---|---|---|---|---|---|---|---|
Shapiro | Lilliefors | Breusch-Pagan | Goldfeld-Quandt | ||||
Cd | 1.94 × 10−1 | 8.76 × 10−2 | 6.64 × 10−4 | 1.000 | 0.000 | 0.71 | 69 |
Ni | 7.54 × 10−1 | 7.09 × 10−1 | 0.000 | 0.999 | 1.00 × 10−7 | 0.31 | 74 |
Pb | 4.80 × 10−6 | 2.40 × 10−6 | 1.58 × 10−3 | 0.832 | 1.25 × 10−3 | 0.14 | 66 |