English Abstract A new method is introduced for judgement of water
(liquid) quality: the drop-picture method. With this method the
movement-quality of water (liquid) can be studied as a totality-parameter
(for instance of importance for the vital chemical biological processes in
living nature). Beside the common analytical judgement technics (chemical,
physical and/or biological), this method has in view to come to a kind of
total-judgement of water (liquid) quality following a less analytical, more
synthetical approach (partly) with supplemental aspects. It can be used in
addition to the conventional judgement of water quality. This method is
practised on water out of different stages of the water-purification process
at the Gemeentewaterleidingen Amsterdam (GWA). The results roughly agree
with the GWA-impressions regarding some weak and strong links in the
purification process, but have no general correlation with commonly used
analytical parameters (there is an additional information-contents). In its
current stage of development, this method already appears to be reliable and
manageable in practice. Necessary refinements are mentioned (they are for
instance ment to answer future questions such as, on the one hand, designing
additional criteria for the selection of drinking-water out of various kinds
of water already released from the hygienic point of view, and, on the other
hand, finding indicators for morpho-diversity of life in and around
water).
