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The Danube flowing across Hungary is a moderately polluted river, at least in its middle stretch, where its greatest polluter is Budapest with 2 million inhabitants and a large industrial complex. Serving the river for drinking water supply, as well, it is obvious that the pollution control for the capital is of paramount importance. There is a 20 year planning concept for the improvement of the sewerage, wastewater treatment and storm water outfall. This long term plan, together with its impact on the water quality of the river and the review of the present conditions, are investigated in this paper.

A review is presented of the development of the International Drinking Water Supply and Sanitation Decade (IDWSSD) launched in 1981 and terminated in 1990. Health aspects of drinking water quality in relation to chemical water contamination are investigated and an outlook to the future is presented as far as the tasks of water pollution control are concerned.

In connection with a thermodynamic analysis of high-performance liquid chromatography, Horvath and Lin developed a three-parameter equation of state. The dimensionless multipliers of this equation were correlated with the critical compressibility factor, zc. A different temperature-correction relationship is now suggested. It is shown that the coefficient m in the modified temperature correction is component-specific and, with polar substances, it is also temperature dependent. Equations that correlate it with the acentric factor and with the polarity factor are given.

In field tests in Hungary, Slovenia and Bulgaria, in allyl isothiocyanate-baited traps significantly more beetles of Phyllotreta cruciferae, Ph. vittula, Ph. undulata, Ph. nigripes, Ph. nodicornis, Ph. balcanica, Ph. atra, Ph. procera, Ph. ochripes, Ph. diademata and Psylliodes chrysocephalus (Coleoptera, Chrysomelidae, Halticinae) were captured than in unbaited control traps. With the exception of Ph. cruciferae, this is the first report on significant field attraction by allyl isothiocyanate for these species. The species spectrum captured included six important agricultural pests. At all sites a great portion of the catch (ranging from ca 30 to 98%) was Ph. cruciferae, irrespective of the plant culture. The second most abundant species present at most sites was Ph. vittula. The present results are very promising from the point of view of applicability of allyl isothiocyanate in Europe as a bait in cabbage flea beetle traps for detection and monitoring.