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Titolo:
Effects and risk assessment of linear alkylbenzene sulfonates in agricultural soil. 5. Probabilistic risk assessment of linear alkylbenzene sulfonates in sludge-amended soils
Autore:
Jensen, J; Lokke, H; Holmstrup, M; Krogh, PH; Elsgaard, L;
Indirizzi:
Natl Environm Res Inst, Dept Terr Ecol, DK-8600 Silkeborg, Denmark Natl Environm Res Inst Silkeborg Denmark DK-8600 8600 Silkeborg, Denmark Danish Inst Agr Sci, Dept Crop Physiol & Soil Sci, Res Ctr Foulum, DK-8830Tjele, Denmark Danish Inst Agr Sci Tjele Denmark DK-8830 Foulum, DK-8830Tjele, Denmark
Titolo Testata:
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
fascicolo: 8, volume: 20, anno: 2001,
pagine: 1690 - 1697
SICI:
0730-7268(200108)20:8<1690:EARAOL>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NOEC TOXICITY DATA; SEWAGE-SLUDGE; MICROBIAL ACTIVITY; SURFACTANTS; CONTAMINANTS; LAS; BIODEGRADATION; BEHAVIOR; FATE;
Keywords:
ecotoxicology; soil fauna; plants; surfactants; detergent;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Jensen, J Natl Environm Res Inst, Dept Terr Ecol, POB 314,Vejlsovej 25, DK-8600 Silkeborg, Denmark Natl Environm Res Inst POB 314,Vejlsovej 25 Silkeborg Denmark DK-8600
Citazione:
J. Jensen et al., "Effects and risk assessment of linear alkylbenzene sulfonates in agricultural soil. 5. Probabilistic risk assessment of linear alkylbenzene sulfonates in sludge-amended soils", ENV TOX CH, 20(8), 2001, pp. 1690-1697

Abstract

Linear alkylbenzene sulfonates (LAS) can be found in high concentrations in sewage sludge and, hence, may enter the soil compartment as a result of sludge application. Here, LAS may pose a risk for soil-dwelling organisms. In the present probabilistic risk assessment, statistical extrapolation has been used to assess the risk of LAS to soil ecosystems. By use of a log-normal distribution model, the predicted no-effect concentration (PNEC) was estimated for soil fauna, plants, and a combination of these. Due to the heterogeneous endpoints for microorganisms, including functional as well as structural parameters, the use of sensitivity distributions is not considered to be applicable to this group of organisms, and a direct, expert evaluation of toxicity data was used instead. The soil concentration after sludge application was predicted for a number of scenarios and used as the predictedenvironmental concentration (PEC) in the risk characterization and calculation of risk quotients (RQ = PEC/PNEC). A LAS concentration of 3.6 mg/kg was used as the current best estimate of PNEC in all RQ calculations. Three levels of LAS contamination (530, 2,600; and 16,100 mg/kg), three half-lives(10, 25, and 40 d), and five different sludge loads (2, 4, 6, 8, and 10 t/ha) were included in the risk scenarios. In Denmark, the initial risk ratiowould reach 1.5 in a realistic worst-case consideration. For countries nothaving similar sludge regulations, the estimated risk ratio may initially be considerably higher. However, even in the most extreme scenarios, the level of LAS is expected to be well beyond the estimated PNEC one year after application. The present risk assessment, therefore, concludes that LAS does not pose a significant risk to fauna, plants, and essential functions of agricultural soils as a result of normal sewage sludge amendment. However, risks have been identified in worst-case scenarios.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:36:57