Thresholds of arsenic toxicity to Eisenia fetida in field-collected agricultural soils exposed to copper mining activities in Chile

Bustos, Víctor; Mondaca, Pedro; Verdejo, José; Sauvé, Sébastien; Gaete, Hernán; Celis‐Diez, Juan L.; Neaman, Alexander

doi:10.1016/j.ecoenv.2015.09.009

Cited by 30 publications

(12 citation statements)

References 58 publications

(72 reference statements)

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“…The As EC50 values were similar among the Ca concentrations, with a mean value of 26 ± 4 µM. Previously reported As EC50 values for different aquatic species range 0.4 µM to 560 µM . The As EC50 values of plants cultivated in nutrient solutions range 1 µM to 330 µM .…”

Section: Discussionsupporting

confidence: 53%

Additive toxicity of zinc and arsenate on barley (Hordeum vulgare) root elongation

Guzman-Rangel

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et al. 2016

Enviro Toxic and Chemistry

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Zinc (Zn) and arsenic (As) are typically present as mixed contaminants in mining-impacted areas; however, their joined effects have rarely been evaluated. The present study was set up to test whether the Zn and H AsO (hereafter, As) mixture toxicity to plants is additive or whether interactions occur. Barley (Hordeum vulgare) root elongation was measured in resin buffered nutrient solutions. The design included ranges of single-element concentrations and combinations at 3 different Ca concentrations (0.5 mM, 2.2 mM, and 15.0 mM) to vary the relative toxicity of Zn . Increasing Ca concentrations decreased Zn toxicity, whereas As toxicity was unaffected by Ca. Root elongation was generally more affected in Zn-As mixtures than in corresponding single-element treatments. This is merely a joint additive effect, as 96% of the root elongation data were within a factor of 1.2 from predictions using the independent action (IA) or concentration addition (CA) model. The CA and IA predictions were similar, and data did not allow identification of equal or dissimilar modes of action. Small but significant Zn-As antagonisms were only found at high effects (>50% inhibition). The present study suggests that mixture effects of Zn and As are environmentally relevant and that current risk assessment underestimates toxicity in multielement-contaminated environments. The CA model can be used as a conservative model for risk assessment; however, for soil-grown plants, soil-exposed studies are needed. Environ Toxicol Chem 2017;36:1556-1562. © 2016 SETAC.

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Section: Discussionsupporting

confidence: 53%

Additive toxicity of zinc and arsenate on barley (Hordeum vulgare) root elongation

Guzman-Rangel

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Qiu

et al. 2016

Enviro Toxic and Chemistry

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“…87-8.79 (Romero-Freire et al 2015). The EC 50 and EC 10 obtained in our study (9.08 and 5.80 mg/kg dry soil, respectively) are in agreement with the ones reported by Bustos et al (2015) and Lock and Janssen (2002b), but low compared to the study of Romero-Freire et al (2015). We used the same Assalt as Romero-Freire et al (2015) and our peat content was 10% and pH-H 2 O 6.27.…”

Section: Toxicity Of Single Metalssupporting

confidence: 93%

Toxicity of binary mixtures of Cu, Cr and As to the earthworm Eisenia andrei

et al. 2020

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Chromated copper arsenate (CCA) mixtures were used in the past for wood preservation, leading to large scale soil contamination. This study aimed at contributing to the risk assessment of CCA-contaminated soils by assessing the toxicity of binary mixtures of copper, chromium and arsenic to the earthworm Eisenia andrei in OECD artificial soil. Mixture effects were related to reference models of Concentration Addition (CA) and Independent Action (IA) using the MIXTOX model, with effects being related to total and available (H 2 O and 0.01 M CaCl 2 extractable) concentrations in the soil. Since only in mixtures with arsenic dose-related mortality occurred (LC 50 92.5 mg/kg dry soil), it was not possible to analyze the mixture effects on earthworm survival with the MIXTOX model. EC 50 s for effects of Cu, Cr and As on earthworm reproduction, based on total soil concentrations, were 154, 449 and 9.1 mg/kg dry soil, respectively. Effects of mixtures were mainly antagonistic when related to the CA model but additive related to the IA model. This was the case when mixture effects were based on total and H 2 O-extractable concentrations; when based on CaCl 2-extractable concentrations effects mainly were additive related to the CA model except for the Cr-As mixture which acted antagonistically. These results suggest that the CCA components do interact leading to a reduced toxicity when present in a mixture.

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“…For instance, we have found only 6 studies in which copper phytotoxicity thresholds have been determined using fieldcontaminated soils (Hamels et al 2014;Kolbas et al 2014Kolbas et al , 2018 Verdejo et al 2015;Mondaca et al 2017;Lillo-Robles et al 2020). Likewise, we are aware of only one study on the arsenic toxicity threshold for Eisenia fetida in fieldcontaminated soils (Bustos et al 2015).Although the importance of using field-contaminated soils-rather than spiked soils-is evident, interpretation of the results from field-contaminated soils presents several difficulties. First, field-contaminated soils often contain several metal pollutants, which makes it difficult to distinguish between the effects of specific metals on plant and soil organism responses.…”

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confidence: 99%

“…In the case of plants, fluctuating nutrient availability in soil may also affect responses, in addition to soil metal toxicity. Using field-contaminated soils, we have, however, demonstrated that detailed characterizations of soil properties and metal concentrations in plant and earthworm tissues yield appropriate estimates of metal toxicity thresholds (Bustos et al 2015;Mondaca et al 2017).Another alternative approach to the use of spiked soils is the so-called fading technique, whereby a range of metal concentrations is obtained by mixing field-contaminated soil with uncontaminated soil in various proportions. The range of metal contamination obtained this way provides more accurate results compared with metal-spiked soils.…”

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confidence: 99%