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Metal availability and soil toxicity after repeated croppings of Thlaspi caerulescens in metal contaminated soils.
Environ Pollut. 2004 Sep; 131(2):243-54.EP

Abstract

Metal phytoextraction with hyperaccumulating plants could be a useful method to decontaminate soils, but it is not fully validated yet. In order to quantify the efficiency of Cd and Zn extraction from a calcareous soil with and without Fe amendment and an acidic soil, we performed a pot experiment with three successive croppings of Thlaspi caerulescens followed by 3 months without plant and 7 weeks with lettuce. We used a combined approach to assess total extraction efficiency (2 M HNO3-extractable metals), changes in metal bio/availability (0.1 M NaNO3-extractable metals and lettuce uptake) and toxicity (lettuce biomass and the BIOMET biosensor). The soil solution was monitored over the whole experiment. In the calcareous soil large Cu concentrations were probably responsible for chlorosis symptoms observed on T. caerulescens. When this soil was treated with Fe, the amount of extracted metal by T. caerulescens increased and metal availability and soil toxicity decreased when compared to the untreated soil. In the acidic soil, T. caerulescens was most efficient: Cd and Zn concentrations in plants were in the range of hyperaccumulation and HNO3-extractable Cd and Zn, metal bio/availability, soil toxicity, and Cd and Zn concentrations in the soil solution decreased significantly. However, a reduced Cd concentration measured in the third T. caerulescens cropping indicated a decrease in metal availability below a critical threshold, whereas the increase of dissolved Cd and Zn concentrations after the third cropping may be the early sign of soil re-equilibration. This indicates that phytoextraction efficiency must be assessed by different approaches in order not to overlook any potential hazard and that an efficient phytoextraction scheme will have to take into account the different dynamics of the soil-plant system.

Authors+Show Affiliations

Keller C
Swiss Federal Institute of Technology, ENAC-ISTE-Laboratory of Soil Science, 1015 Lausanne, Switzerland. catherine.keller@epfl.ch
Hammer D
No affiliation info available

MeSH

Biodegradation, EnvironmentalBiological AvailabilityBiomassCadmiumLettuceMetals, HeavySoilSoil PollutantsThlaspiZinc

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15234091

Citation

Keller, Catherine, and Daniel Hammer. "Metal Availability and Soil Toxicity After Repeated Croppings of Thlaspi Caerulescens in Metal Contaminated Soils." Environmental Pollution (Barking, Essex : 1987), vol. 131, no. 2, 2004, pp. 243-54.
Keller C, Hammer D. Metal availability and soil toxicity after repeated croppings of Thlaspi caerulescens in metal contaminated soils. Environ Pollut. 2004;131(2):243-54.
Keller, C., & Hammer, D. (2004). Metal availability and soil toxicity after repeated croppings of Thlaspi caerulescens in metal contaminated soils. Environmental Pollution (Barking, Essex : 1987), 131(2), 243-54.
Keller C, Hammer D. Metal Availability and Soil Toxicity After Repeated Croppings of Thlaspi Caerulescens in Metal Contaminated Soils. Environ Pollut. 2004;131(2):243-54. PubMed PMID: 15234091.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Metal availability and soil toxicity after repeated croppings of Thlaspi caerulescens in metal contaminated soils. AU - Keller,Catherine, AU - Hammer,Daniel, PY - 2003/07/09/received PY - 2004/02/16/accepted PY - 2004/7/6/pubmed PY - 2004/12/16/medline PY - 2004/7/6/entrez SP - 243 EP - 54 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 131 IS - 2 N2 - Metal phytoextraction with hyperaccumulating plants could be a useful method to decontaminate soils, but it is not fully validated yet. In order to quantify the efficiency of Cd and Zn extraction from a calcareous soil with and without Fe amendment and an acidic soil, we performed a pot experiment with three successive croppings of Thlaspi caerulescens followed by 3 months without plant and 7 weeks with lettuce. We used a combined approach to assess total extraction efficiency (2 M HNO3-extractable metals), changes in metal bio/availability (0.1 M NaNO3-extractable metals and lettuce uptake) and toxicity (lettuce biomass and the BIOMET biosensor). The soil solution was monitored over the whole experiment. In the calcareous soil large Cu concentrations were probably responsible for chlorosis symptoms observed on T. caerulescens. When this soil was treated with Fe, the amount of extracted metal by T. caerulescens increased and metal availability and soil toxicity decreased when compared to the untreated soil. In the acidic soil, T. caerulescens was most efficient: Cd and Zn concentrations in plants were in the range of hyperaccumulation and HNO3-extractable Cd and Zn, metal bio/availability, soil toxicity, and Cd and Zn concentrations in the soil solution decreased significantly. However, a reduced Cd concentration measured in the third T. caerulescens cropping indicated a decrease in metal availability below a critical threshold, whereas the increase of dissolved Cd and Zn concentrations after the third cropping may be the early sign of soil re-equilibration. This indicates that phytoextraction efficiency must be assessed by different approaches in order not to overlook any potential hazard and that an efficient phytoextraction scheme will have to take into account the different dynamics of the soil-plant system. SN - 0269-7491 UR - https://www.unboundmedicine.com/medline/citation/15234091/Metal_availability_and_soil_toxicity_after_repeated_croppings_of_Thlaspi_caerulescens_in_metal_contaminated_soils_ DB - PRIME DP - Unbound Medicine ER -