Registration Dossier

Administrative data

Endpoint:
additional ecotoxicological information
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data are given, the study meets basic scientific principles

Data source

Reference
Reference Type:
publication
Title:
Gewässerökologische Prüfung des Umweltverhaltens von Zeolith A
Author:
Hamm A and Raff J
Year:
1979
Bibliographic source:
Die Prüfung des Umweltverhaltens von Natrium-Aluminium-Silikat Zeolith A als Phosphatersatzstoff in Wasch- und Reinigungsmitteln. Schmidt, Berlin. Umweltbundesamt, Materialien 7/79, 72-77

Materials and methods

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Zeolite A (SASIL, sodium aluminium silicate), doped with Indium
- Chemical name: Zeolite, cuboidal, crystalline, synthetic, non-fibrous
- Framework: cuboidal

Results and discussion

Any other information on results incl. tables

Effects in ponds:
Nutrients were more abundant in static ponds than in flow-through ponds, producing more phytoplankton, but less macrophytes.
There were no qualitative or quantitative differences between SASIL-treated and control ponds of both types concerning phytoplankton (14 species studied). The Shannon diversity index for phytoplankton did not differ from the untreated controls. However, species diversity was greater in the static ponds. Development of macrophytes was strongest in the SASIL-treated flow-through pond (80% covered), whereas weight gain of fish (carp) was slightly less compared to control or static ponds, probably due to dense plant growth. No differences concerning macrophytes or fish were found in treated and control static ponds.
No differences were observed in heavy metal contents of treated and control ponds. Sasil was found in the upper layers (0-5 cm) of the sediment.

Effects in streams:
No significant differences concerning degradation of organic substances (measured as BOD, COD or organic C) and the biocoenoses between SASIL-treated and untreated streams were found. There was a slight increase in the saproby index of the SASIL-treated stream. In the test with sewage-effluent, also no significant
differences between treated and untreated streams was observed concerning degradation of organic substances and biocoenotic changes (esp. zoobenthos was quantitatively studied). Sasil was settled off the streams for 80-90%, the rest stayed in the sediment (60-240 mg/kg d.w. after some months).

Applicant's summary and conclusion