Abstract
This paper deals with waste waters produced by industrial producers during recent three years. Its main purpose is to evaluate the data monitored from discharges of three leather plants where eight traditional variables (COD, BOD, insoluble matters, pH, and the concentrations of ammonia, total nitrogen, chromium and sulphides) were regularly analyzed and quantified. Chemometrical and statistical methods were approved as very useful tools for characterization and classification of various kinds of water samples considering the environmental and metrological aspects. For this purpose, multivariate (multidimensional) techniques of data analysis and correlation analysis were especially very useful. The mentioned techniques are used in this work to (1) reveal the concealed
 interrelations of the monitored characteristics of waste waters, (2) compare the results of individual waste water producers and find the most important polluting source during a long time period, and (3) derive some generally valid conclusions regarding the observed results.
Highlights
Pollution of the rivers and seas jeopardizes production of oxygen in water
The most important variables, which characterize the water quality and indicate the extent of pollution are the concentrations of chromium, total nitrogen, ammonium (NH4), and sulphide (S2)
Together with chemical oxygen demand, COD, biological oxygen demand, BOD5, water acidity, and amount of insoluble matters (IM) they were regularly monitored at the output from three industrial sites in the same Slovak town during the years 2006, 2007 and 2008, which has created the measurement basis for the performed research
Summary
Pollution of the rivers and seas jeopardizes production of oxygen in water. Waste water is coming into environment as a consequence of the industrial and agricultural production and the town activities. It has an unhealthy influence on human and environment. Contaminations present in waste water contain various inorganic and organic matters. Together with chemical oxygen demand, COD, (coded CHSK according to the Slovak designation), biological oxygen demand, BOD5, (coded BSK5 according to the Slovak designation), water acidity (pH), and amount of insoluble matters (IM) they were regularly monitored at the output from three industrial sites in the same Slovak town during the years 2006, 2007 and (partly) 2008, which has created the measurement basis for the performed research
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