TP114-DEMO - Uredba o emisiji snovi in toplote pri odvajanju odpadnih voda v vode in javno kanalizacijo

This part of IS0 9555 deals with the use of chemical tracers in discharge measurements by the dilution method. Apparatus and methods of general application are set out in IS0 9555-l and are not repeated here, with the exception of those relating specifically to chemical tracers. Chemical tracers have several advantages\ as follows.
a) As with fluorescent tracers, the handling of the tracer follows normal chemical laboratory practice, and no special equipment (e.g. radiation
shielding) is required. Care is still required, however, when handling concentrated tracer, to avoid contamination of samples and, with some
tracers, for reasons of chemical toxicity.
b) In general, chemical tracers are widely available commercially, and tnay be stored indefinitely.
c) Analysis may be possible using laboratory facilities currently used for water quality determination.
d) In general, chemical tracers are phofochemically stable.

This International Standard specifies the procedure of calibration of current-meters of rotating-element type as well as stationary-sensor type (electromagnetic type) in straight open tanks. It also specifies the types of tank, rating carriage and equipment to be used and the method of presenting the results. The procedure does not take into account any possible difference existing between the behaviour of a currentmeter moving in motionless water and that of a fixed current-meter in turbulent flow.