Journal ArticleDOI
Toxicity of heavy metals to microorganisms and microbial processes in agricultural soils: a review.
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TLDR
In this article, a hypothesis is formulated to explain how microorganisms may become affected by gradually increasing soil metal concentrations and this is discussed in relation to defining safe or critical soil metal loadings for soil protection.Abstract:
An increasing body of evidence suggests that microorganisms are far more sensitive to heavy metal stress than soil animals or plants growing on the same soils. Not surprisingly, most studies of heavy metal toxicity to soil microorganisms have concentrated on effects where loss of microbial function can be observed and yet such studies may mask underlying effects on biodiversity within microbial populations and communities. The types of evidence which are available for determining critical metal concentrations or loadings for microbial processes and populations in agricultural soil are assessed, particularly in relation to the agricultural use of sewage sludge. Much of the confusion in deriving critical toxic concentrations of heavy metals in soils arises from comparison of experimental results based on short-term laboratory ecotoxicological studies with results from monitoring of long-term exposures of microbial populations to heavy metals in field experiments. The laboratory studies in effect measure responses to immediate, acute toxicity (disturbance) whereas the monitoring of field experiments measures responses to long-term chronic toxicity (stress) which accumulates gradually. Laboratory ecotoxicological studies are the most easily conducted and by far the most numerous, but are difficult to extrapolate meaningfully to toxic effects likely to occur in the field. Using evidence primarily derived from long-term field experiments, a hypothesis is formulated to explain how microorganisms may become affected by gradually increasing soil metal concentrations and this is discussed in relation to defining “safe” or “critical” soil metal loadings for soil protection.read more
Citations
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Journal ArticleDOI
Determination of Copper, Iron, Nickel and Zinc in fuel kerosene by FAAS after adsorption and pre-concentration on 2-aminothiazole-modified silica gel
Paulo dos Santos Roldan,Paulo dos Santos Roldan,Ilton Luiz de Alcântara,Julio Cesar Rocha,Cilene C. F. Padilha,Pedro de Magalhães Padilha +5 more
TL;DR: In this paper, the surface characteristics and surface area of the silica gel were obtained before and after chemical modification using FT-IR, Kjeldhal and surface analysis (B.E.T.).
Journal ArticleDOI
Sewage sludge effects on carbon dioxide‐carbon production from a desurfaced soil
TL;DR: In this article, sludge applications produced an increase of CO2 efflux in the field of 30-50% during summer during summer Microbial biomass was not affected by sludge some months after the application but metabolic activity and organic matter mineralization were enhanced.
Journal ArticleDOI
Interactions and associated resistance development mechanisms between microplastics, antibiotics and heavy metals in the aquaculture environment
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The Effect of Copper on The Structure of the Ammonia-Oxidizing Microbial Community in an Activated Sludge Wastewater Treatment Plant
Pamela Principi,Federica Villa,Barbara Giussani,Elisabetta Zanardini,Francesca Cappitelli,Claudia Sorlini +5 more
TL;DR: The present study reports on the effects of chronic and acute copper contamination on the ammonia uptake ability of the AO microorganisms and the structure ofThe AOB community in a wastewater system and gives indications on the response of wastewater plants under similar conditions.
Journal ArticleDOI
Physiological responses to cadmium, copper, lead, and zinc of Sinorhizobium sp. strains nodulating Medicago sativa grown in Tunisian mining soils
Kais Zribi,Naceur Djébali,Moncef Mrabet,Nabiha Khayat,Abderrazek Smaoui,Ammar Mlayah,Mohamed Elarbi Aouani +6 more
TL;DR: The results support the use of Medicago sativa–sinorhizobium symbiosis for the regeneration and enrichment of moderately contaminated soils.
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