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Environmental fate & pathways

Bioaccumulation: terrestrial

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Reference
Endpoint:
bioaccumulation: terrestrial
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Field study with limited representativeness.
Qualifier:
no guideline available
Principles of method if other than guideline:
Earthworms and soil samples were collected from an agricultural field amended with biosolids from a municipal wastewater treatment plant, to measure the presence and potential for transfer of AHTN from land-applied biosolids to earthworms. Soil and earthworm samples were collected (in triplicate) in the spring (circa 30 days after soil amendment) and fall (140-155 days after soil amendment). The biosolid contained 177 mg AHTN/kg dwt.
GLP compliance:
no
Radiolabelling:
no
Type:
BSAF
Value:
ca. 1
Basis:
whole body d.w.
Calculation basis:
steady state
Remarks on result:
other: in spring (circa 30 days after soil amendment)
Type:
BSAF
Value:
ca. 0.1
Basis:
whole body d.w.
Calculation basis:
steady state
Remarks on result:
other: In fall (circa 150 days after soil amendment)
Validity criteria fulfilled:
yes
Conclusions:
This field study with sludge amended soil showed that AHTN does not significantly bioaccumulate from soil into earthworms, as the BSAF in earthworms ranges from 1 to 0.1, from shortly after application to 5 months later.
Executive summary:

Earthworms and soil samples were collected from an agricultural field amended with biosolids from a municipal wastewater treatment plant, to measure the presence and potential for transfer of AHTN from land-applied biosolids to earthworms. Soil and earthworm samples were collected (in triplicate) in the spring (about 30 days after soil amendment) and fall (140-155 days after soil amendment). The biosolid contained 177 mg AHTN/kg dwt. For the soil and earthworm samples collected in the spring, a Bio Accumulation Factor (BAF) - the average ratio of the AHTN concentration in earthworm tissue to the AHTN concentration in soil - of 1 was determined. For the samples collected in the fall, this average ratio was determined to be 0.1.

It is concluded that AHTN does not bioaccumulate significantly from sludge amended soil into earthworms.

Description of key information

The study of Kinney et. al. (2008) showed that there was no bioaccumulation of AHTN in worms (BSAF ≤ 1).

Key value for chemical safety assessment

Additional information

BSAF were derived in spring and in autumn from a field study on sludge amended agricultural soils, that were sampled 30 and circa 150 days after the sludge amendment. The BSAF was 1 and 0.1, respectively (based on dry weights)