Nitrate Origin in the Zagreb Aquifer System

Table 2

Results of PCA (significant loadings are marked in italics).

Parameter	Historical groundwater analysis		Sampled water
	PC 1	PC 2	PC 1	PC 2
Water temperature	−0.08	0.85	0.11	0.88
O2	0.78	−0.30	—	—
NO3^−	0.88	0.08	0.67	0.11
Ca^2+	0.92	0.25	0.87	0.43
Mg^2+	0.87	0.15	0.91	0.27
Na^+	0.66	0.68	0.64	0.67
K^+	0.30	0.70	0.38	0.73
Cl^−	0.65	0.60	0.65	0.66
SO4^2−	0.68	0.57	0.54	0.73
HCO3^−	0.89	0.25	0.90	0.19
EC	0.90	0.42	0.82	0.55