In the present study, the chemical characteristics of the Mirosala well water are studied. Statistical analysis have been carried out by
calculating of basic statistical parameters, anomalies (extremes and outliers) and correlation coefficients between different pairs of
variables. The levels of some chemical parameters of the well water are compared with the World Health Organization directives for
drinking water. From the results of field work and laboratory analyses it was found out that Mirosala well water fulfils the criteria set by the
WHO. The statistical regression analysis showed that electrical conductivity is in high significant positive relationship with consumption of
KMnO4 and a moderately high positive correlation relationship with pH, Fe2+
, NO2
-
and Ca2+ (possible sign of lithology influence). No
correlation was found with SiO2, hardness, NO3
-
, Cl-
, Mg2+ and HCO3
-
. In the water sample S3 outlier value of SiO2 (31.9 mg L-1
) was
registered, as possible sign of lithology influence. The distribution of low pollutants has been described as lithologically and non
lithologically controlled factor.
Key words: Quality assessment; correlation coefficients; well water; Mirosala, statistical analysis
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