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Diss Factsheets

Ecotoxicological information

Toxicity to soil microorganisms

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Administrative data

Endpoint:
toxicity to soil microorganisms
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
no data
Reliability:
4 (not assignable)

Data source

Reference
Reference Type:
publication
Title:
Biodegradation: The reason for the inefficiency of small organic acids in chelantassisted phytoextraction
Author:
Evangelou M.W. H., Ebel M., Hommes G., and Schaeffer A.
Year:
2008
Bibliographic source:
Water Air Soil Pollute

Materials and methods

Principles of method if other than guideline:
The experiment is designed to investigate NLMWOAs (citric acid, oxalic acid and tartaric acid) consumption by isolated microorganisms on minimal medium agar plates, however, the results indicate such substances imposed no hazardous effect on the isolated soil bacteria and fungi.

Test material

Constituent 1
Chemical structure
Reference substance name:
(+)-tartaric acid
EC Number:
201-766-0
EC Name:
(+)-tartaric acid
Cas Number:
87-69-4
Molecular formula:
C4H6O6
IUPAC Name:
(2R,3R)-2,3-dihydroxybutanedioic acid
Details on test material:
the original source is not specified, however, a reasonable deduction is that it should be at a high purity as the study is proposed to “investigate the reason for the inefficiency of three NLMWOAs (citric acid, oxalic acid and tartaric acid) in enhancing phytoextraction”, which needs the usage of substances as pure as possible to exclude interference from impurities.

Test substrate

Vehicle:
no

Test organisms

Test organisms (inoculum):
other: Bacteria (Burkholderia sp., Ralstonia sp.); Fungi (Saccharomyces sp.; Cordyceps sp.; Basidiomyces sp.; Paecilomyces sp.; Paecilomyces sp.) individually.

Test conditions

Test temperature:
The flasks were separated in three different groups at incubation temperatures of 18°C, 28°C and 37°C
Moisture:
The soil samples were adjusted to a 50% maximum water holding capacity
Details on test conditions:
pH: 5.5;
temperature: at 18°C, 28°C and 37°C;
time: 3 weeks
Nominal and measured concentrations:
air dried agricultural soil: 1g

Results and discussion

Details on results:
Tartaric acid (2g/L) can be degraded by the isolated microorganisms, which indicate that tartaric acid is not toxic to such isolated bacteria and fungi.

Applicant's summary and conclusion

Conclusions:
It is indicated that tartaric acid is not toxic to such isolated bacteria and fungi.
Executive summary:

The experiment is designed to investigate NLMWOAs (citric acid, oxalic acid and tartaric acid) consumption by isolated microorganisms. Relevant results implied that tartaric acid (2g/L) can be degraded by the isolated microorganisms, which indicates that tartaric acid is not toxic to such isolated bacteria and fungi.