Narrow pH Range of Surface Water Bodies Receiving Pesticide Input in Europe

Bundschuh, Mirco; Weyers, Arnd; Ebeling, Markus; Elsaesser, David; Schulz, Ralf

doi:10.1007/s00128-015-1665-7

Cited by 23 publications

(12 citation statements)

References 8 publications

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“…The 24-h herbicide exposure resulted in short-term effects on macrophyte growth that differed over time and between the 2 macrophyte species tested. During the entire recovery period of 42 d, water pH values recorded during the present study were higher than those usually observed in European natural lotic surface waters [34]. Nevertheless, pH-associated alteration in iofensulfuron-sodium stability is unlikely because the concentrations remained stable during the 24-h exposure period ( Table 2).…”

Section: Macrophyte Response To Iofensulfuron-sodiumcontrasting

confidence: 50%

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

Wieczorek

Bakanov

Lagadic

et al. 2016

Enviro Toxic and Chemistry

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Interest in stream mesocosms has recently revived for higher tier aquatic macrophyte risk assessment of plant protection products mainly because 1) the highest predicted environmental concentrations for the assessment of effects are frequently derived from stream scenarios, and 2) they allow an effect assessment using stream-typical pulse exposures. Therefore, the present stream mesocosm study used an herbicide pulse exposure and evaluated the responses of Elodea canadensis and Myriophyllum spicatum. Macrophytes were exposed for 24 h to 1 μg/L, 3 μg/L, 10 μg/L, and 30 μg/L of the herbicide iofensulfuron-sodium with a subsequent recovery period of 42 d. Biological endpoints were growth rates of the main, side, and total shoot length, the shoot number, the maximum root length, and the dry weight. The total shoot length was identified as the most sensitive endpoint; the growth rate of the total shoot length was inhibited by up to 66% and 45% in M. spicatum and E. canadensis, respectively. The lowest no observed effect concentrations (NOECs) were observed at day 7 and/or day 14 after herbicide treatment and were 1 μg/L for M. spicatum and 3 μg/L for E. canadensis. The no-observed-ecologically-adverse-effect concentrations (NOEAECs) were 10 μg/L and 30 μg/L for M. spicatum and E. canadensis, respectively. Such or similar mesocosm designs are useful to simulate typical stream exposures and estimate herbicide effects on aquatic macrophytes in stream systems. Environ Toxicol Chem 2017;36:1090-1100. © 2016 SETAC.

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Section: Macrophyte Response To Iofensulfuron-sodiumcontrasting

confidence: 50%

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

Wieczorek

Bakanov

Lagadic

et al. 2016

Enviro Toxic and Chemistry

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“…Depending on their physico-chemical properties, many pollutants dissociate under certain pH conditions, and hence, their fate and behavior in the environment is strongly influenced by changes in the pH [ 5 , 19 ]. Among these ionizing chemicals are pesticides, flame retardants, but also pharmaceuticals and further household chemicals like detergents.…”

Section: Introductionmentioning

confidence: 99%

A combined experimental and modeling study to evaluate pH-dependent sorption of polar and non-polar compounds to polyethylene and polystyrene microplastics

et al. 2018

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BackgroundThe contamination of aquatic ecosystems with both anthropogenic pollutants and particles in particular (microscopic) plastic debris items is of emerging concern. Since plastic particles can accumulate contaminants and potentially facilitate their transport, it is important to properly investigate sorption mechanisms. This is especially required for a large variety of chemicals that can be charged under environmental conditions and for which interactions with particles may hence go beyond mere partitioning.ResultsIn this study, sorption experiments with two types of microplastic particles (polyethylene and polystyrene) and 19 different contaminants (pesticides, pharmaceuticals, and personal care products) were performed at three different pH values. We could show that sorption to plastic particles is stronger for hydrophobic compounds and that neutral species usually contribute more to the overall sorption. Bulk partitioning coefficients were in the same order of magnitude for polyethylene and polystyrene. Furthermore, our results confirm that partition coefficients for polar compounds can only be accurately determined if the solid-to-liquid ratio in batch experiments is more than 6–7 orders of magnitude higher than any plastic concentration detected in the environment. Consequently, only a minor fraction of pollutants in water bodies is associated with microplastics.ConclusionsAlthough neutral species primarily dominate the overall sorption, hydrophobic entities of ionic species cannot be neglected for some compounds. Notwithstanding, our results show that since microplastic concentrations as currently observed in the environment are very low, they are only a relevant sorbent for strongly hydrophobic but not for polar compounds.Electronic supplementary materialThe online version of this article (10.1186/s12302-018-0155-z) contains supplementary material, which is available to authorized users.

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“…The compliance of the experiments performed without aging and those with aging in deionized water indicated that no or only limited interactions between Cu and TiO 2 ‐NPs, as well as the aging vessel, occurred over the aging duration of up to 168 h (Supplemental Data, Figure S2). The lower pH of deionized water (7.0 ± 0.1) compared to test medium (8.2 ± 0.1) has, because of a competition with H + for binding sites , potentially reduced the adsorption of Cu to the aging vessels but also to TiO 2 ‐NPs (cf. Grover et al and Gilbert et al ).…”

Section: Discussionmentioning

confidence: 99%

“…To determine the influence of pH during the aging of Cu and TiO 2 ‐NP mixtures, the aging medium (in the present study test medium) buffered with 1.046 g 3‐( N ‐morpholino) propansulfonic acid (MOPS)/L (Carl Roth), a nontoxic substance , was adjusted to environmentally relevant pH values. These pH values were 6.5 and 8 , and the adjustment was facilitated by additions of HCl or NaOH (2 N standard solution; Carl Roth). The adjustment of the pH using HCl or NaOH only marginally influenced the ionic strength of the test medium (below 1 per mille) and is thus not further considered.…”

Section: Methodsmentioning

confidence: 99%

Nanosized titanium dioxide influences copper‐induced toxicity during aging as a function of environmental conditions

Rosenfeldt

Seitz

Haigis

et al. 2016

Enviro Toxic and Chemistry

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Titanium dioxide nanoparticles (TiO2 -NPs) adsorb co-occurring heavy metals in surface waters, modulating their toxicity for freshwater invertebrates. The processes triggering this interaction may be influenced by several environmental parameters; however, their relative importance remains unclear. The present study assessed the implications of aging on the joint acute toxicity of copper (Cu) and TiO2 -NPs for Daphnia magna over a duration of up to 72 h. The influences of aging duration as well as ionic strength, pH, and presence of different qualities of organic matter during aging were assessed. The results indicated that the presence of TiO2 -NPs often reduced the Cu-induced toxicity for daphnids after aging (albeit with varying extent), which was displayed by up to 3-fold higher EC50 (50% effective concentration) values compared to the absence of TiO2 -NPs. Moreover, the Cu speciation, influenced by the ionic composition and the pH as well as the presence of organic additives in the medium, strongly modulated the processes during aging, with partly limited implications of the aging duration on the ecotoxicological response of D. magna. Nonetheless, the present study underpins the potential of TiO2 -NPs to modify toxicity induced by heavy metals in freshwater ecosystems under various environmental conditions. This pattern, however, needs further verification using heavy metal ions with differing properties in combination with further environmental factors, such as ultraviolet irradiation. Environ Toxicol Chem 2016;35:1766-1774. © 2015 SETAC.

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Narrow pH Range of Surface Water Bodies Receiving Pesticide Input in Europe

Cited by 23 publications

References 8 publications

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

Response and recovery of the macrophytes Elodea canadensis and Myriophyllum spicatum following a pulse exposure to the herbicide iofensulfuron‐sodium in outdoor stream mesocosms

A combined experimental and modeling study to evaluate pH-dependent sorption of polar and non-polar compounds to polyethylene and polystyrene microplastics

Nanosized titanium dioxide influences copper‐induced toxicity during aging as a function of environmental conditions

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