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Environmental fate & pathways

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Endpoint:
other distribution data
Type of information:
experimental study
Adequacy of study:
key study
Study period:
no data
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well described study. The method is similar to the OECD 312 guideline, however only 1 soil was studied.
Cross-reference
Reason / purpose:
reference to same study

Data source

Reference
Reference Type:
publication
Title:
Sorption, transport and degrdation of quinoline in unsaturated soil
Author:
Thomsen AB, Henriksen K, Gron C, Moldrup P
Year:
1999
Bibliographic source:
Environ Sci technol 33: 2891-2898

Materials and methods

Test guideline
Qualifier:
equivalent or similar to
Guideline:
OECD Guideline 312 (Leaching in Soil Columns)
GLP compliance:
not specified
Type of study:
soil leaching
Media:
water - soil

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Analytical grade, distilled before use.

Results and discussion

Any other information on results incl. tables

The solute dispersion experiment showed that the analysis of quinoline transport and retardation could be based on the assumption of negligible quinoline dispersion.

pH was important for the breakthrough of quinoline, hence at pH 7.0, the breakthrough was faster than at pH 4.6.

The retardation factors obtained were : 9.4 (at pH 4.6, thin layer); 6.9 (pH 4.6, thick layer); 6.4 (pH 7.0, thin layer) and 4.5 (pH 7.0, thick layer). The retardation factor represents the delay in breakthrough of the solute (quinoline) relative to the breakthrough of a nonretarded solute.

These values show that quinoline is mobile in soils.

At the same time, the biodegradation in the columns was determined.

Compared with the initial quinoline added, it was found that for the thin and thick layers 72 and 65% of quinoline was retained (or missing) in the column at pH 4.6 and 23% and 49% at pH 7.0. Quinoline was transformed during transport. Small amounts of 2 -OH-quinoline were detected in the experiments at 20h.

At the end of the experiments, no quinoline, 2 -OH quinoline or other products could be detected in the soil columns, so it was assumed that quinoline was mineralized at both pH.

Applicant's summary and conclusion

Conclusions:
Quinoline is mobile in soils and is mineralized quickly.
Executive summary:

A soil column experiment was performed with quinoline (50 mg/kg soil) at pH 7.0 and 4.6. Transport and biodegradation were evaluated for 7.5 days.

Quinoline is mobile in the soil and is quickly mineralized.