Naslov
Plant protection products in agricultural soils: Do active ingredients show a comparable pattern in worms and in soil?

Autori
Schmidt, Thomas ; Viric Gasparic, Helena ; Kimmel, Stefan ; Hoeger, Stefan ; Bazok, Renata

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
SETAC Europe 28th Annual Meeting Abstract Book. Responsible and Innovative Research for Environmental Quality. / - Rim : Society of Environmental Toxicology and Chemistry (SETAC), 2018, 560-561

Skup
SETAC Europe 28th Annual Meeting

Mjesto i datum
Rim, Italija, 13.05.2018. - 17.05.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Gujavice, bioakumulacija, imidakloprid, insekticidi, rezidue
(Earthworms, bioaccumulation, imidacloprid, insecticides, residues,)

Sažetak
The environmental risk assessment of plant protection products on soil organisms is mainly based on the outcome of laboratory and extended laboratory studies (EFSA 2017). However, the link from the laboratory to realistic field conditions over several seasons is not well established. Currently no validated trigger for bioaccumulation in soil ecosystems is available (EFSA 2017). One possible approach for filling this gap is proposed by combining experimentally determined residue data from earthworms and data from degradation studies in the field. Earthworms were sampled at different seasons from eight fields in Croatia and analysed for 26 active ingredients. The concentrations of 26 analysed active ingredients were 0.000-0.247 mg/kg worm fresh weight with a mean of 0.005 mg/kg. The percentage of samples with values below the limit of detection (LOD), values below the limit of quantification (LOQ = 0.001 mg/kg) and values above LOQ was 29, 42 and 29 %, respectively. Based on publicly available draft assessment reports from EC and EFSA, degradation parameters (DT50, DT90) were used to calculate degradation curves and the current concentration in soil at the date of worm sampling. By comparing analysed residues in worms and calculated concentrations in soil, a substance-specific bioaccumulation factor could be calculated. In the case of imidacloprid, the analysed residue levels in earthworm samples from the fields tended to increase with time whereas the calculated concentrations in soil decreased with time as expected, resulting in a supposed increasing bioaccumulation potential of imidacloprid under field conditions. The procedure proposed here – in the absence of analysed soil data – is a simple estimation which combines field history data with data from publicly available draft assessment reports. This approach may be useful for the assessment of the bioaccumulation potential of an active ingredient from a plant protection product under realistic field conditions.

Izvorni jezik
Engleski

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