Lengyel, Bánhidi, Paksy: PRINCIPAL COMPONENT ANALYSIS OF PHYSICAL AND CHEMICAL FEATURES OF RIVER SAJÓ

PRINCIPAL COMPONENT ANALYSIS OF PHYSICAL AND
CHEMICAL FEATURES OF RIVER SAJÓ

A. Lengyel ^1,2 ,O. Bánhidi ^3,4,L. Paksy ⁵

¹ University of Miskolc Institute of Chemistry, Department of Analytical Chemistry,
Miskolc, Egyetemváros, H-3515; E-mail: akmla@gold.uni-.miskolc.hu
² University of Miskolc, Co-operation Centre of Materials Science and Mechatronics
Miskolc, Egyetemváros, H-3515
³ Metalcontrol Ltd. Miskolc, Vasgyári u 43, H-3540;
⁴ University of Miskolc, Institute of Chemistry, Department of Analytical Chemistry;
Miskolc, Egyetemváros, H-3515; E-mail: banhidio@freemail .hu
⁵ University of Miskolc, Institute of Chemistry, Department of Analytical Chemistry,
Miskolc, Egyetemváros, H-3515; E-mail: akmpl@gold.uni-miskolc.hu

Concerning the time-interval 1986-1995, data of six measuring stations along the whole Hungarian section of river Sajó has been processed by the aid of the principal component analysis (PCA). The evaluation of the following data has been performed:

water output, suspended material quantity, concentration of nitrate –and phosphate ions for every two weeks;
in addition to these : total amount of iron, chlorophyl-A, water temperature, total amount of the dissolved material quantity— as yearly average values, and
data referring to 14 inorganic components in one measuring station.

The statistical investigation has been carried out for each measuring station as well as for the whole river-section in Hungary.

The application of the PCA aimed at the followings:

determination of component(s) characterising the state of the river ;
demonstration of the anthropogenic effects ;
characterisation of the seasonal changes.

By the interpretation of the results of the PCA method, those obtained by the aid of the descriptive statistics has been considered, too (distribution, trend, and correlation).

The principal component analysis as well as the tests of the descriptive statistics has been performed by the aid of software “Statistica for Windows“.

It could be stated that

the PCA method (its version best fitting to the given task) can be applied well to the accomplishment of the investigation mentioned above;
In this way, among others, the favourable changes ensued in the Hungarian section of river Sajó can be demonstrated as well some up-to-date problems, too.