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The present state and the trends of the recovery of heavy metals from wastewaters are presented. The classical precipitation techniques are insatisfactory due to increases of solubility in the presence of impurity ions and/or complexing agents. At present, ion‐exchange processes constitute the...
For the direct potentiometric measurement by means of a sulphidselective solidstate membrane electrode (as the reference electrode a calomel electrode with a salt bridge filled with 1M KNO3‐solution) there were mixed 25 ml sample with 25 ml sulphide‐antioxidant buffer (0.2 M ascorbic acid in 2 M...
Investigated are the regressions and correlations between TOC, CSD‐Cr, COD‐Mn, BOD5 and CHCl3‐extract for model waters with the substances Präwozell W‐ON 100 and Emulgator 30 contained in them as the most important tensides as well as for the real clarification plant influents of a chemical...
To prevent infection with Dracunculus medinensis, a carrier host, the copepod Cyclops, has to be controlled. After preceding laboratory investigations a field trial with well water and different additions of chlorine and sodium permanganate is carried out. The exposure is performed at an ambient...
For the determination of the contents of chlorophyll a and phaeopigment a in sediment samples the method according to LORENZEN with its principle and the error sources is discussed in detail. The acidification required for the determination of the phaeopigments should be carried out on a final...
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