11 Monitoring of Groundwater Quality in Poland
241
water belonging to class II and class III (Table 11.1). Class IV water has been identified in three observation wells numbered II/1215/1, II/292/1 and II/1424/1, whereas
class V water has been detected within the area of the observation well numbered
II/1526/1. The chemical composition of water from selected observation wells and
springs has been presented in the Piper diagram (Fig. 11.4).
The Piper diagram clearly shows the multi-ionic water from the observation well
number II/527/1 located in the Kuyavian and Pomeranian voivodeship and from the
observation well number II/1318/1 located in the Masovian voivodeship as well as
the water of the SO 4 –Ca type identified in the Subcarpathian voivodeship. The ions
II/1178/1 II/527/1
II/1325/1 II/314/1
II/1526/1 II/1568/1 II/1118/1 II/1607/1 II/1388/1
II/1215/1 II/1239/1 II/292/1
II/484/1
II/1435/1 II/1424/1 II/1188/1 II/103/1
II/745/3
100
100
100
100
100
100
0
0
0
0
0
0
0
0
SO4 + Cl
Ca + Mg
Mg
SO4
Cl
Ca
Na + K
CO3 + HCO3
CATION
ANION
2017 Quaternary
Fig. 11.4 Chemical composition of quaternary aquifer in the piper diagram (own elaboration based
on Polish Geological Institute—National Research Institute data)