engleski

Dependence of microbiological indicators on sampling points by using statistical method ANOVA

Water is a tasteless, odourless and colourless fluid which represents one of the basic conditions for life. Recreational uses of water have significant and major influences on human health and well-being. Water pollution has been very widespread under which it implies a decrease in water quality due to subsequently received specimens. Pollution implies the degradation of quality water by physical, chemical, biological or radiological contamination to the extent that it is impossible its use and such water is harmful to human health. Water quality, which represents the presence of individual indicators of a particular substance or energy, is a criterion for determining the basic classification of water use. In order to test the quality of bathing water, data are collected through a continuous process of surface water monitoring. The quality of bathing water depends primarily on microbiological indicators, i.e. on the amount of Escherichia coli and intestinal enterococci. The testing of bathing water quality was conducted at 19 sampling points at two locations in the city of Zagreb (Lake Bundek and Lake Jarun). In order to examine the relation of the number of microbiological parameters (E. coli and intestinal enterococci) to sampling points ANOVA statistical method was used. Analysis of variance (ANOVA) is a statistical procedure that allows one or more factors to be examined simultaneously in a large number of groups of subjects. In other words, ANOVA is a criterion that shows whether differences between groups are accidentally greater than differences within groups. It is most commonly used to determine whether there are differences between several arithmetic means and whether these differences are statistically significant or random. Excel was used for calculating parameters of one-factor analysis of variance, which determined that there was no statistical correlation between microbiological parameters and sampling points at Lake Jarun, whereas at Lake Bundek there was a correlation at one location. Given that a number of results indicate that there is no significant correlation between microbiological indicators and sampling points, it is very important to conduct regular sampling and analysis of water quality, which enables swimmers to enjoy swimming and reduces the probability of forbidding swimming due to poor water quality.

: ANOVA, Escherichia coli, intestinal enterococci, microbiological indicators, water quality

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