Potassium triboron pentaoxide

Toxicity to terrestrial plants

Administrative data

Endpoint:

toxicity to terrestrial plants: long-term

Type of information:

migrated information: read-across based on grouping of substances (category approach)

Adequacy of study:

supporting study

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: This study did not follow standard guidelines. Insufficent information on methods and results (the soil propertie were not reported, no details on equilibration or test duration. B doses are reported as ppm).

Data source

Reference

Reference Type:

publication

Title:

Unnamed

Year:

1983

Materials and methods

Test guideline

Qualifier:

no guideline followed

Deviations:

not applicable

Principles of method if other than guideline:

growth inhibition test with beans, radish, tomatoes, thimoty and corn

GLP compliance:

no

Test material

Test material information

Constituent 1

Details on test material:

reagent grade borate-65, containing 20% B

Sampling and analysis

Analytical monitoring:

no

Test substrate

Vehicle:

no

Details on preparation and application of test substrate:

- Boron was added as sodium borate solution (Na2B4O7.10H2O)
- No information on mixing

Test organisms

1

Species:

Phaseolus vulgaris

Plant group:

Dicotyledonae (dicots)

Details on test organisms:

snap bean

2

Species:

Raphanus sativus

Plant group:

Dicotyledonae (dicots)

Details on test organisms:

radish

3

Species:

Lycopersicon esculentum

Plant group:

Dicotyledonae (dicots)

Details on test organisms:

tomato

4

Species:

Zea mays

Plant group:

Monocotyledonae (monocots)

Details on test organisms:

corn

5

Species:

other: Phleum pratense

Plant group:

Monocotyledonae (monocots)

Details on test organisms:

timothy

Study design

Test type:

not specified

Study type:

laboratory study

Substrate type:

natural soil

Limit test:

no

Remarks:

not reported

Test conditions

Test temperature:

Day and night temperature regimes were about 22 and 16°C, respectively.

pH:

6.0

Moisture:

as required by the crop

Details on test conditions:

TEST SYSTEM
- Testing facility: greenhouse
- Test container (type, material, size): 4.5 l pails
- Amount of soil: 3500 g
- No. of plants (retained after thinning): 14 radish and 10 of the other 4 crops
- No. of replicates: 4


SOURCE AND PROPERTIES OF SUBSTRATE (if soil)
- fine sandy loam


LIGHTNING
- 14h day/10h night
- Intensity: 1100 lux
- Fluorescent and incandescent light sources

Nominal and measured concentrations:

0, 1ppm, 2ppm, 4 ppm (assumed to be mg B:kg dw)

Reference substance (positive control):

no

Results and discussion

Effect concentrations

Effect concentrations 1

Species:

Phaseolus vulgaris

Dose descriptor:

NOEC

Effect conc.:

>= 4 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

element

Remarks:

B

Basis for effect:

growth

Remarks:

yield pods

Remarks on result:

other: 5% stimulation at largest dose tested

Effect concentrations 2

Species:

Raphanus sativus

Dose descriptor:

NOEC

Effect conc.:

>= 4 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

element

Remarks:

B

Basis for effect:

growth

Remarks:

yield roots

Remarks on result:

other: 50% stimulation at largest dose tested

Effect concentrations 3

Species:

other: Phleum pratense

Dose descriptor:

NOEC

Effect conc.:

2 mg/kg soil dw

Nominal / measured:

nominal

Conc. based on:

element

Remarks:

B

Basis for effect:

growth

Remarks:

yield shoot

Remarks on result:

other: 2% inhibition at NOEC, 31% inhibition at LOEC (4 mg B/kg dw)

Reported statistics and error estimates:

NOEC values are described based on the reportes least significant difference (LSD, p<0.05) between treatments. No informtion was presented on how this LSD value was derived.

Applicant's summary and conclusion

Validity criteria fulfilled:

not specified

Conclusions:

The results are not considered reliable and are not used for PNEC derivation (this study did not follow standard guidelines, insufficent information on methods and results: the soil propertie were not reported, no details on equilibration or test duration, B doses are reported as ppm).