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Silver Toxicity Thresholds for Multiple Soil Microbial Biomarkers.
Vasileiadis, Sotirios; Brunetti, Gianluca; Marzouk, Ezzat; Wakelin, Steven; Kowalchuk, George A; Lombi, Enzo; Donner, Erica.
Afiliação
  • Vasileiadis S; Future Industries Institute , University of South Australia , Mawson Lakes 5095 , Australia.
  • Brunetti G; Department of Biochemistry and Biotechnology , University of Thessaly , Biopolis 41500 , Larissa , Greece.
  • Marzouk E; Future Industries Institute , University of South Australia , Mawson Lakes 5095 , Australia.
  • Wakelin S; Future Industries Institute , University of South Australia , Mawson Lakes 5095 , Australia.
  • Kowalchuk GA; Division of Soil and Water Sciences , Arish University , Dahyet El Salam, El Arish, North Sinai , 31111 , Egypt.
  • Lombi E; Scion Research, Christchurch 8011 , New Zealand.
  • Donner E; Institute of Environmental Biology , Utrecht University , Utrecht 3584 CH, The Netherlands.
Environ Sci Technol ; 52(15): 8745-8755, 2018 08 07.
Article em En | MEDLINE | ID: mdl-29949713
ABSTRACT
Material flow analysis shows that soil is a key repository for silver (Ag) from (nano)silver-functionalized consumer products, but the potential effects of Ag toxicity, via Ag+ release, on soil microbial communities and their ecosystem services remains largely unknown. We examined the responses of multiple microbial biomarkers to increasing Ag+ doses (nine concentrations, 0-2000 mg kg-1) in nine different soils representing a wide range of soil properties. Analyses included substrate-induced microbial respiration, nine different soil enzyme activities, and quantification of bacterial 16S-rRNA (SSU) and fungal intergenic spacer (ITS) copies. The resulting half-maximal effective concentrations (EC50) for Ag ranged from ∼1 to >500 mg kg -1 and showed soil-specific responses, including some hormesis-type responses. Carbon cycle-associated enzyme activities (e.g., cellobiohydrolase, xylosidase, and α/ß-glucosidase) responded similarly to Ag. Sulfatase and leucine-aminopeptidase activities (linked to the sulfur and nitrogen cycles) were the most sensitive to Ag. Total organic carbon, and to a lesser extent pH, were identified as potentially useful response predictors, but only for some biomarkers; this reflects the complexity of soil Ag chemistry. Our results show Ag toxicity is highly dependent on soil characteristics and the specific microbial parameter under investigation, but end point redundancies also indicated that representative parameters for key microbial functions can be identified for risk assessment purposes. Sulfatase activity may be an important Ag toxicity biomarker; its response was highly sensitive and not correlated with that of other biomarkers.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Solo Tipo de estudo: Prognostic_studies / Risk_factors_studies Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prata / Solo Tipo de estudo: Prognostic_studies / Risk_factors_studies Idioma: En Ano de publicação: 2018 Tipo de documento: Article