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Ecotoxicological information

Toxicity to microorganisms

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Reference
Endpoint:
toxicity to microorganisms, other
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Remarks:
experimental data of read across substances
Justification for type of information:
Data for the target chemical is summarized based on the structurally similar read across chemicals
Reason / purpose:
read-across source
Reason / purpose:
read-across source
Qualifier:
according to
Guideline:
other: as mentioned below
Principles of method if other than guideline:
WoE report is based on three toxicity to microorganism studies as-
2. and 3.
GLP compliance:
not specified
Analytical monitoring:
not specified
Vehicle:
not specified
Test organisms (species):
other: 2. Photobacterium phosphoreum and 3. Tetrahymena sp.
Test type:
not specified
Water media type:
saltwater
Remarks:
2. saltwater and 3. freshwater
Total exposure duration:
48 h
Test temperature:
2. 15ᵒC
3. 32°C
pH:
2. pH range used is 5 to 9
3. No data available
Reference substance (positive control):
yes
Remarks:
2. Recommended reference substance: Phenol and Sodium pentachlorophenate and 3. No data available
Duration:
30 min
Dose descriptor:
EC50
Effect conc.:
19 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
other: Reduction in light output
Remarks on result:
other: 2.
Duration:
48 h
Dose descriptor:
EC50
Effect conc.:
13.5 mg/L
Nominal / measured:
nominal
Conc. based on:
test mat.
Basis for effect:
growth inhibition
Remarks on result:
other: 3.

2.

Table: Toxicity data

 

#

5 m- pT

15 m- pT

30 m- pT

Name

Formula

ppm

M. wt.

1225

-

-

0.76

Test chemical

C7H8O2

18.8

108.15

 

Where,

Footnote = Purity of chemical (in %) and/or deviation from standard conditions.

pT =Measured concentrations (in log(L/mmol) at which there is a 50% reduction of the light emission relative to controls at the stated exposure times of 5, 15 and 30 min.

ppm =The compound's toxicity expressed in parts per million (ppm) or mg/L. If more than one entry is provided on the same line under the pT headings, preference is given to the 30-min exposure EC50 level, second preference to the 15-min level and third preference to the 5-min level.

3. No data available

Validity criteria fulfilled:
not specified
Conclusions:
On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the EC50 value of the test chemical on test organism can be expected to be ranges from 13.5 to 19 mg/l.
Executive summary:

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the toxic effect of the test chemical on microorganisms.The studies are as mentioned below:

Aquatic toxicity study of micro-organism to the test chemical was conducted using Photobacterium phosphoreum, strain NRRL-B-11177 (also referred to asVibrio fischerii, strain NRRL-B-11177). The study was performed at a temperature of 15ᵒC and pH range 5 to 9, respectively. Recommneded reference substance that can be used for the study were Phenol and Sodium pentachlorophenate, respectively. When the test bacterium Photobacterium phosphoreum, strain NRRL-B-11177 was exposed to the test chemical, reduction in light output was observed. Thus, based on this effect, the 30 mins EC50 value was determined to be 19 mg/l.

Another toxicity toTetrahymena thermophilastudy was carried out at 32°C.The study was based on the effects of the test chemical on test organism. On the basis of the effect on growth rate of the test organismTetrahymena thermophila, the 48 hr EC50 value was determined to be 13.5 mg/l.

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the EC50 value of the test chemical on test organism can be expected to be ranges from 13.5 to 19 mg/l.

Description of key information

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the EC50 value of the test chemical on test organism can be expected to be ranges from 13.5 to 19 mg/l.

Key value for chemical safety assessment

EC50 for microorganisms:
19 mg/L

Additional information

Data available for the structurally and functionally similar read across chemicals has been reviewed to determine the toxic effect of the test chemical on microorganisms. The studies are as mentioned below:

 

Aquatic toxicity study of micro-organism to the test chemical was conducted using Photobacterium phosphoreum, strain NRRL-B-11177 (also referred to as Vibrio fischerii, strain NRRL-B-11177). The study was performed at a temperature of 15ᵒC and pH range 5 to 9, respectively. Recommneded reference substance that can be used for the study were Phenol and Sodium pentachlorophenate, respectively. When the test bacterium Photobacterium phosphoreum, strain NRRL-B-11177 was exposed to the test chemical, reduction in light output was observed. Thus, based on this effect, the 30 mins EC50 value was determined to be 19 mg/l.

 

Another toxicity to Tetrahymena thermophile study was carried out at 32°C.The study was based on the effects of the test chemical on test organism. On the basis of the effect on growth rate of the test organism Tetrahymena thermophila, the 48 hr EC50 value was determined to be 13.5 mg/l.

 

On the basis of the experimental studies of the structurally and functionally similar read across chemical and applying the weight of evidence approach, the EC50 value of the test chemical on test organism can be expected to be ranges from 13.5 to 19 mg/l.