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By Milan J. Schwuger

Deals assurance of the environmental behaviour of detergent ingredients, targeting physiochemical interactions with soil and sediments. this article offers the present country of information on lately brought detergent ingredients, together with zeolites, polycarboxylate compounds, ethylene dinitrilotetraacetic acid (EDTA), and nitrilotriacetic acid (NTA).

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005 mg/liter using thin-layer chromatography after a sample-specific cleaning step, but he suggests that these values are still influenced by interference from substances from the sample. 016 mg/liter in the Rhine and other German rivers. Hellmann's results have confirmed again speculation about the impact of sample composition on the assessment of surfactants in surface water, sludge, and soil. The MBAS method analyzes mainly biogenic pseudosurfactants if surface waters are investigated. This is confirmed by the research of Steber at the Rhine at Düsseldorf-Himmelgeist from 1990 to 1992 (Fig.

Substantial concentrations of MBAS have been found occasionally in the river or surface waters used for drinking and industrial process water supply. For the Ruhr area, this had dramatic effects (Fig. 3) during the last weeks of the dry year 1959. An emergency situation occurred for the water supply in the city of Essen. Apart from the quantitative supply situation, the quality of the drinking water was especially affected. The drinking water for Essen is Ruhr River water artificially filtered through soil.

Summary 34 Bibliography 36 I The Problem of Surfactants (19591964) In 1959, German rivers were foaming. 73 mg/liter in the city of Essen on December 21, 1959. Downstream Page 4 of dams massive and stable foam layers formed (Fig. 1). In canal locks barges disappeared in the foam. Long foam trails like condensation formed behind barges on the Rhine. The (few) biological sewage treatment plants with activated sludge processes produced foam barriers a couple of meters tall, which were blown by the wind into the surrounding water (Fig.

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