Research Article

Nitrate Origin in the Zagreb Aquifer System

Table 1

Correlation result matrices (statistically significant correlation coefficients are marked in italics): (a) Pearson coefficients on historical groundwater analysis, (b) Spearman coefficients on historical groundwater analysis, (c) Pearson coefficients on sampled water, and (d) Spearman coefficients on sampled water.
(a)

ParameterWater temperaturepHORPO2NO3Ca2+Mg2+Na+K+ClSO42−HCO3EC

Water temperature1.00
pH−0.211.00
ORP−0.150.241.00
O2−0.19−0.64−0.051.00
NO30.11−0.77−0.130.751.00
Ca2+0.13−0.90−0.230.550.771.00
Mg2+0.09−0.77−0.210.480.740.851.00
Na+0.49−0.79−0.250.330.640.780.631.00
K+0.46−0.54−0.170.170.350.370.250.661.00
Cl0.40−0.69−0.200.300.590.750.610.900.491.00
SO42−0.37−0.77−0.230.220.580.800.740.800.510.741.00
HCO30.12−0.91−0.230.560.700.930.800.690.490.650.751.00
EC0.26−0.95−0.280.570.790.940.810.880.560.840.850.921.00

(b)

ParameterWater temperaturepHORPO2NO3Ca2+Mg2+Na+K+ClSO42−HCO3EC

Water temperature1.00
pH−0.211.00
ORP−0.150.241.00
O2−0.19−0.64−0.021.00
NO30.02−0.78−0.070.781.00
Ca2+0.12−0.91−0.220.560.761.00
Mg2+0.02−0.79−0.240.500.730.861.00
Na+0.44−0.87−0.310.500.650.810.641.00
K+0.47−0.76−0.160.400.550.600.480.831.00
Cl0.35−0.87−0.250.620.760.830.670.930.731.00
SO42−0.23−0.86−0.240.440.630.840.720.790.690.801.00
HCO30.12−0.92−0.210.540.690.940.800.770.620.790.841.00
EC0.22−0.97−0.270.620.800.940.800.890.730.920.890.931.00

(c)

ParameterWater temperaturepHORPNO3Ca2+Mg2+Na+K+ClSO42−HCO3EC

Water temperature1.00
pH−0.231.00
ORP−0.130.151.00
NO30.34−0.40−0.031.00
Ca2+0.47−0.480.170.531.00
Mg2+0.36−0.420.180.570.911.00
Na+0.57−0.410.130.400.830.731.00
K+0.57−0.110.120.240.650.550.731.00
Cl0.59−0.48−0.050.550.820.740.900.651.00
SO42−0.68−0.36−0.150.460.780.680.770.640.861.00
HCO30.27−0.300.360.470.870.850.700.560.620.581.00
EC0.55−0.520.110.540.960.880.910.690.900.840.841.00

(d)

ParameterWater temperaturepHORPNO3Ca2+Mg2+Na+K+ClSO42−HCO3EC

Water temperature1.00
pH−0.261.00
ORP−0.170.231.00
NO30.34−0.37−0.051.00
Ca2+0.55−0.460.120.581.00
Mg2+0.40−0.420.070.600.931.00
Na+0.63−0.430.070.430.840.751.00
K+0.59−0.160.120.250.670.550.751.00
Cl0.64−0.53−0.080.610.860.790.900.671.00
SO42−0.70−0.40−0.220.540.810.720.780.660.881.00
HCO30.35−0.220.330.490.840.810.720.550.680.631.00
EC0.61−0.520.070.590.960.880.910.690.920.830.841.00