Effect of natural and synthetic surface coatings on the toxicity of multiwalled carbon nanotubes toward green algae

Zhang, Luqing; Cheng, Lei; Chen, Jiajun; Yang, Kun; Zhu, Lizhong; Lin, Daohui

doi:10.1016/j.carbon.2014.11.050

Cited by 74 publications

(41 citation statements)

References 48 publications

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“…No similar algal toxicity data of other NPs in surface water samples are available for a comparison with the result of this study. As compared with the reported algal toxicity of similar NPs in the synthetic culture media with the half growth inhibition concentrations (IC 50 ) of 4.9 mg/L for TiO 2 NPs (Lin et al, 2012b), 60 mg Zn/L for ZnO NPs (Franklin et al, 2007), 2.28 mg/L for Ag (Chen et al, 2013), and 14.5 mg/L for CNTs (Zhang et al, 2015), the toxicities of the NPs towards algae were mitigated in the natural water samples in this study. The toxicities of the NPs varied greatly, depending on the type and concentration of NPs as well as the water sample type.…”

Section: Toxicities Of the Nps In The Water Samplesmentioning

confidence: 64%

“…DOM in the fresh water samples could help to hinder the TiO 2 -cell heteroagglomeration. NPs adhering to and agglomeration with cells would facilitate NP damage to membranes and entrance of cells, as reported for TiO 2 , CNTs, and ZnO NPs with algal cells (Lin et al, 2012b;Long et al, 2012;Zhang et al, 2015;Chen et al, 2012).…”

Section: The Np-cell Heteroagglomeration In the Water Samplesmentioning

confidence: 78%

“…DOMs generally alleviated the nanotoxicity, owing to their complexation with the NP-released toxic ions, the hindrance of NP-organism contact, and/ or the reduced generation of reactive oxygen species (Kim et al, 2013;Lin et al, 2012b;Zhao et al, 2013). Enhanced nanotoxicity, however, was also observed in the presence of DOMs (Wang et al, 2011;Zhang et al, 2015). Until now, most studies have been conducted in artificial waters, which are dramatically different from natural waters with complex compositions.…”

Section: Introductionmentioning

confidence: 99%

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Physicochemical transformation and algal toxicity of engineered nanoparticles in surface water samples

Zhang

Yang

et al. 2016

Environmental Pollution

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a b s t r a c tMost studies on the behavior and toxicity of engineered nanoparticles (NPs) have been conducted in artificial water with well-controlled conditions, which are dramatically different from natural waters with complex compositions. To better understand the fate and toxicity of NPs in the natural water environment, physicochemical transformations of four NPs (TiO 2 , ZnO, Ag, and carbon nanotubes (CNTs)) and their toxicities towards a unicellular green alga (Chlorella pyrenoidosa) in four fresh water and one seawater sample were investigated. Results indicated that water chemistry had profound effects on aggregation, dissolution, and algal toxicity of the NPs. The strongest homoaggregation of the NPs was associated with the highest ionic strength, but no obvious correlation was observed between the homoaggregation of NPs and pH or dissolved organic matter content of the water samples. The greatest dissolution of ZnO NPs also occurred in seawater with the highest ionic strength, while the dissolution of Ag NPs varied differently from ZnO NPs. The released Zn 2þ and especially Ag þ mainly accounted for the algal toxicity of ZnO and Ag NPs, respectively. The NP-cell heteroagglomeration occurred generally for CNTs and Ag NPs, which contributed to the observed nanotoxicity. However, there was no significant correlation between the observed nanotoxicity and the type of NP or the water chemistry. It was thus concluded that the physicochemical transformations and algal toxicities of NPs in the natural water samples were caused by the combined effects of complex water quality parameters rather than any single influencing factor alone. These results will increase our knowledge on the fate and effects of NPs in the aquatic environment.

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Section: Toxicities Of the Nps In The Water Samplesmentioning

confidence: 64%

Section: The Np-cell Heteroagglomeration In the Water Samplesmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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Physicochemical transformation and algal toxicity of engineered nanoparticles in surface water samples

Zhang

Yang

et al. 2016

Environmental Pollution

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“…The TEM images show that nano-sized Th(OH)4 was deposited both inside and outside the cells. Recent progresses in the aquatic toxicity of engineered nanomaterials suggest that insoluble nano-sized particles might exhibit toxicity to green algae by the following processes: (1) the shading effect may attenuate the photosynthesis by reducing light transmittance; (2) the heteroagglomeration and physical interaction may lead to the internalization of nanoparticles, cell membrane disruption and endocyte outflow; (3) the permeation and entry of nanoparticles into the cells may induce the elevation of intracellular ROS levels and the membrane lipid peroxidation [24][25][26][29][30][31]. All these processes might contribute to the toxic effects of Th to C. pyrenoidosa.…”

Section: Ultrastructural Alterationsmentioning

confidence: 99%

Influence of Speciation of Thorium on Toxic Effects to Green Algae <em>Chlorella pyrenoidosa</em>

Peng

Ding

et al. 2017

Preprint

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Thorium (Th) is a natural radioactive element present in the environment and has a potential to be used as a nuclear fuel. Relatively little is known about the influence and toxicity of Th in the environment. In the present study, the toxicity of Th to the green algae Chlorella pyrenoidosa (C. Pyrenoidosa) was evaluated by algal growth inhibition, biochemical assays and morphologic observations. In the cultural medium (OECD TG 201), Th(NO3)4 was transformed to amorphous precipitation of Th(OH)4 due to hydrolysis. Th was toxic to C. Pyrenoidosa, with a 96 h half maximum effective concentration (EC50) of 10.4 μM. Scanning electron microscopy shows that Th-containing aggregates were attached onto the surface of the algal cells, and transmission electron microscopy indicates the internalization of nano-sized Th precipitates and ultrastructural alterations of the algal cells. The heteroagglomeration between Th(OH)4 precipitation and alga cells and enhanced oxidative stress might play important roles in the toxicity of Th. To our knowledge, this is the first report of the toxicity of Th to algae with its chemical species in the exposure medium. This finding provides useful information on understanding the fate and toxicity of Th in the aquatic environment.

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“…Zhou et al (2015) showed that the toxicity of graphene oxide (GO) to zebrafish embryos could be reduced by humic acid (HA) [12]. Lin et al (2015) proved that toxicity of carbon nanotubes to algal cells was enhanced in the presence of SDBS and TX100; however, HA made the toxicity of carbon nanotubes diminished [13]. The purpose of this study is to explore the effect of citric acid on toxicity of graphene to freshwater algae (Chlorella pyrenoidosa).…”

Section: Introductionmentioning

confidence: 99%

Effect of citric acid on toxicity of graphene towards freshwater algae (Chlorella pyrenoidosa)

Guo¹,

Song²,

Cao³

2016

Proceedings of the 2016 5th International Conference on Environment, Materials, Chemistry and Power Electronics

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Abstract. With the increasing in production and application, graphene will inevitable be released into the aquatic environment and have impacts on aquatic organisms. In this work, we investigated the toxicity of graphene to algal cells (Chlorella pyrenoidosa) in the presence of dissolved organic matter. The results showed that the toxicity of graphene is concentration dependent, and the median effective concentration (EC 50 ) at 96 h was 41.35 mg/L. In addition, the toxicity was significantly reduced by citric acid (CA), as a type of dissolved organic matter. The alleviated toxicity of CA was concentration dependent. This finding could provide useful data for assessing the environmental risk of graphene.

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Effect of natural and synthetic surface coatings on the toxicity of multiwalled carbon nanotubes toward green algae

Cited by 74 publications

References 48 publications

Physicochemical transformation and algal toxicity of engineered nanoparticles in surface water samples

Physicochemical transformation and algal toxicity of engineered nanoparticles in surface water samples

Influence of Speciation of Thorium on Toxic Effects to Green Algae <em>Chlorella pyrenoidosa</em>

Effect of citric acid on toxicity of graphene towards freshwater algae (Chlorella pyrenoidosa)

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