Registration Dossier

Administrative data

Endpoint:
other distribution data
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study conducted according to recognised Japanese guidelines under GLP conditions. Although this study is not specifically designed to address the distribution endpoint it contains specific data of direct relevance and importance.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2009
Report Date:
2009

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: Study on microbial degradation of chemical substances (MHLW/PFSB Notification No. 1121002 Nov 21, 2003, METI/MIB Notification No. 2 Nov 13 2003, and MOE/EPB Notification No. 031121002 last revised Nov 20, 2006)
GLP compliance:
yes
Type of study:
other: Biodegradation
Media:
water - sewage sludge

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Details on test material:
Purity 99.55%

Results and discussion

Any other information on results incl. tables

Parent substance (Molyvan 855J):

The test substance itself was found to be almost completely eliminated in the experimental study and so a direct compartmental distribution for the substances cannot be shown. It can be, however, indirectly inferred as predominating to the aqueous phase based upon the analysis of the compartmental distribution of the degradates.

Molybdic acid:

Molybdic acid is detected entirely in the aqueous phase with nothing detected in the organic phase. These species were also found in a comparative test run with pure water only, though at a lower percentage level.

Organic molybdenum species:

Organic molybdenum species were not found during this analysis and hence are not present at any significant level. These species were found in a comparative test run with pure water only.

Structurally modified organic substances:

Structurally modified organic substances were detected in the aqueous phase and at concentrations which showed a mass balance with degradation rate of the parent substance. These substances were not detected in the organic phase. The compartmental distribution of the structurally modified organic substances is considered, therefore, to be predominately to the aqueous phase.

Discussion:

Important differences are found between the behaviour of the substance in purified water compared with aqueous media containing biotic matter. The primary difference is, that presence of biotic matters seems to eliminate organic molybdenum species in favour of molybdic acid and structurally modified organic species; and this leads to a compartmental distribution which predominates in the aqueous phase with negligible matter in the organic phase.

Proposed compartmental distributions:

Molyvan 855J: Water 100%, sludge 0%

Molybdic acid: Water 100%, sludge 0%

Structurally modified organic substances: Water 100%, sludge 0%

Applicant's summary and conclusion

Conclusions:
Important differences are found between the behaviour of teh substance in purified water compared with aqueous media containing biotic matter. The primary difference is that presence of biotic matters seems to eliminate organic molybdenum species in favour of molybdic acid and structurally modified organic species, and this leads to a compartmental distribution which predominates in the aqueous phase with negligible matter in the organic phase.

Proposed compartmental distributions:
Molyvan 855J: Water 100%, sludge 0%
Molybdic acid: Water 100%, sludge 0%
Structurally modified organic substances: Water 100%, sludge 0%