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Diss Factsheets

Environmental fate & pathways

Bioaccumulation: terrestrial

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
bioaccumulation: terrestrial
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Principles of method if other than guideline:
Greenhouse study with 14C-phthalic acid
GLP compliance:
no
Radiolabelling:
yes
Vehicle:
yes
Details on preparation and application of test substrate:
14C-labelled phthalic acid added to unlabelled phthalic acid,
and dissolved in ethanol
Test organisms (species):
other: plants
Type:
BCF
Value:
0.013
Basis:
other: plant tissue
Calculation basis:
steady state
Type:
BCF
Value:
0.005
Basis:
other: seeds
Calculation basis:
steady state
Bioaccumulation factor (BF) [ppm in plant tissue/ppm initial soil
application (dry weight basis)] averaged for all tested plants and seeds:
plant : 0.013
seed : 0.0046

Extractable 14C phthalic acid (%) after final harvest:
corn : 4.5
fescue : 5.2
mature wheat : 9.2
wheat seed : 46.7
mature soybean plants: 15.3

Average bioaccumulation ratios for total 14C:
- for seeds : 0.0005
- for plants : 0.003
Executive summary:

In green house studies 14C-phthalic acid was applied to soil planted with wheat (Triticum aestivum)/corn (Zea mays) or soybeans (Glycine max)/tall fescue (Festuca arundinacea). For phthalic acid the bioaccumulation ratios were 0.013 for plants and 0.0046 for seeds. TLC analysis showed that the percent of the extractable 14C still in phthalic acid, was 5 % in corn and fescue, 15 % in soybean, 9 % in wheat plants, and the highest for wheat seed (47 %) (Dorney et al., 1985).

Description of key information

In green house studies using 14C-phthalic acid as test substance bioaccumulation ratios of 0.013 for plants and 0.0046 for seeds were obtained (Dorney et al., 1985). This study demonstrates the relatively low potential for bioaccumulation of phthalic acid in plants.

Key value for chemical safety assessment

BCF (terrestrial species):
0.013 dimensionless

Additional information

In green house studies 14C-phthalic acid was applied to soil planted with wheat (Triticum aestivum) /corn (Zea mays) or soybeans (Glycine max) /tall fescue (Festuca arundinacea). For phthalic acid the bioaccumulation ratios were 0.013 for plants and 0.0046 for seeds. TLC analysis showed that the percent of the extractable 14C still in phthalic acid, was 5 % in corn and fescue, 15 % in soybean, 9 % in wheat plants, and the highest for wheat seed (47 %) (Dorney et al., 1985). This study demonstrates the relatively low potential for accumulation of phthalic acid in plants.