Nitrate Origin in the Zagreb Aquifer System

Table 4

Average values of parameters in defined clusters.

Cluster	NO3^− (mg/l)	Cl^− (mg/l)	Na^+ (mg/l)	K^+ (mg/l)	SO4^2− (mg/l)	δ^15N-NO3^− (‰)	δ^18O-NO3^− (‰)	NO3^−/Cl^−	NO3^−/Na^+	NO3^−/K^+	NO3^−/SO4^2−
1	12.68	27.88	15.82	2.81	21.58	8.53	1.17	0.28	0.35	3.17	0.90
2	24.06	38.02	16.02	1.98	19.97	7.71	0.87	0.54	0.86	8.19	1.90
3	28.98	79.10	36.75	4.96	41.52	9.43	0.37	0.21	0.30	3.84	1.14
4	18.58	113.41	47.52	5.41	67.94	12.83	3.23	0.10	0.15	2.18	0.42