Bioaccumulation and toxicity of hexachlorobenzene in Chlorella vulgaris and Daphnia magna

Muñoz, Marı́a Jesús; Ramos, C.; Tarazona, José V.

doi:10.1016/0166-445x(96)00010-0

Cited by 31 publications

(12 citation statements)

References 16 publications

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“…As paddies constitute a feeding habitat for several bird species, persistence should be directly related to long-term exposure, even in the absence of bioaccumulation potential, as the feeding behaviour of several species includes the consumption of soil particles within their food. In addition, the standard bioconcentration test in fish may not be the reference for covering the bioaccumulation potential, and alternative assessments studying the bioaccumulation in algae and aquatic invertebrates exposed to contaminated algae can be more relevant (Muñoz et al 1996). There are several models (e.g.…”

Section: Discussionmentioning

confidence: 98%

Development of an innovative conceptual model and a tiered testing strategy for the ecological risk assessment of rice pesticides

Tarazona¹,

Sánchez²

2006

Paddy Water Environ

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Rice paddies constitute a very special agrobiosystem, which for some circumstances, could be considered as a human driven wetland. The complexity of such dynamic systems is a key element for conducting ecological risk assessments, in addition, the proximity of rice paddies to areas of high ecological value must be considered. This paper presents a new conceptual model for conducting ecological risk assessments of pesticides and other agrochemicals in rice, based on a combination of three main elements, the source of the stressor, the exposed environmental compartments and the relevance of the ecological receptors. A tiered testing strategy, starting with the standard requirements for pesticides and moving to specific higher tier studies with three levels of risk refinement is also presented.

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Section: Discussionmentioning

confidence: 98%

Development of an innovative conceptual model and a tiered testing strategy for the ecological risk assessment of rice pesticides

Tarazona¹,

Sánchez²

2006

Paddy Water Environ

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“…Data for the uptake rate constants of PCBs by other aquatic organisms are for Daphnia magna [52], rainbow trout [53,54], oyster [55], guppy [56], goldfish [57], Atlantic salmon [58], brook trout [59,60], and Pontoporeia hoyi [61]. uptake rate constants of other hydrophobic chemicals are 198 ϫ 10 3 L/kg/d and 132 ϫ 10 3 L/kg/d for tetrachloroethylene in Heterosigma akashiwo and Skeletonema costatum, respectively [39], and 53 ϫ 10 3 L/kg/d for HxCBz in Chlorella vulgaris [40].…”

Section: Uptake Rate Constantmentioning

confidence: 99%

Bioconcentration Kinetics of Hydrophobic Chemicals in Different Densities of Chlorella Pyrenoidosa

Sijm¹,

Broersen²,

Roode³

et al. 1998

Environ Toxicol Chem

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Abstract-Algal density-dependent bioconcentration factors and rate constants were determined for a series of hydrophobic compounds in Chlorella pyrenoidosa. The apparent uptake rate constants of the hydrophobic compounds in algae varied between 200 and 710,000 L/kg/d, slightly increased with hydrophobicity within an experiment, were relatively constant for each algal density, and fitted fairly within existing allometric relationships. The bioavailability of the hydrophobic test compounds was significantly reduced by sorption by algal exudates. The sorption coefficients of the hydrophobic compounds to the algal exudates were between 80 and 1,200 L/kg, and were for most algal densities in the same order of magnitude as the apparent bioconcentration factors to the algae, that is, between 80 and 60,200 L/kg. In typical field situations, however, no significant reduction in bioavailability due to exudates is expected. The apparent elimination rate constants of the hydrophobic compounds were high and fairly constant for each algal density and varied between 2 and 190/d. Because the apparent elimination rate constants were higher than the growth rate constant, and were independent of hydrophobicity, we speculated that other factors dominate excretion, such as exudate excretionenhanced elimination. Bioconcentration factors increased less than proportional with hydrophobicity, i.e., the octanol-water partition coefficient [K ow ]. The role of algal composition in bioconcentration is evaluated. Bioconcentrations (kinetics) of hydrophobic compounds that are determined at high algal densities should be applied with caution to field situations.

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“…The values of the uptake rate constants in the present study (Table 3) agree fairly well with those of Skoglund et al [24], and with other values from the literature. Reported uptake rate constants of other hydrophobic chemicals are 198 × 10 3 L/kg/d and 132 × 10 3 L/kg/d for tetrachloroethylene in Heterosigma akashiwo and Skeletonema costatum , respectively [39], and 53 × 10 3 L/kg/d for HxCBz in Chlorella vulgaris [40].…”

Section: Discussionmentioning

confidence: 99%

Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa

Sijm

Broersen

Roode

et al. 1998

Enviro Toxic and Chemistry

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Algal density‐dependent bioconcentration factors and rate constants were determined for a series of hydrophobic compounds in Chlorella pyrenoidosa. The apparent uptake rate constants of the hydrophobic compounds in algae varied between 200 and 710,000 L/kg/d, slightly increased with hydrophobicity within an experiment, were relatively constant for each algal density, and fitted fairly within existing allometric relationships. The bioavailability of the hydrophobic test compounds was significantly reduced by sorption by algal exudates. The sorption coefficients of the hydrophobic compounds to the algal exudates were between 80 and 1,200 L/kg, and were for most algal densities in the same order of magnitude as the apparent bioconcentration factors to the algae, that is, between 80 and 60,200 L/kg. In typical field situations, however, no significant reduction in bioavailability due to exudates is expected. The apparent elimination rate constants of the hydrophobic compounds were high and fairly constant for each algal density and varied between 2 and 190/d. Because the apparent elimination rate constants were higher than the growth rate constant, and were independent of hydrophobicity, we speculated that other factors dominate excretion, such as exudate excretion‐enhanced elimination. Bioconcentration factors increased less than proportional with hydrophobicity, i.e., the octanol–water partition coefficient [Kow]. The role of algal composition in bioconcentration is evaluated. Bioconcentrations (kinetics) of hydrophobic compounds that are determined at high algal densities should be applied with caution to field situations.

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Bioaccumulation and toxicity of hexachlorobenzene in Chlorella vulgaris and Daphnia magna

Cited by 31 publications

References 16 publications

Development of an innovative conceptual model and a tiered testing strategy for the ecological risk assessment of rice pesticides

Development of an innovative conceptual model and a tiered testing strategy for the ecological risk assessment of rice pesticides

Bioconcentration Kinetics of Hydrophobic Chemicals in Different Densities of Chlorella Pyrenoidosa

Bioconcentration kinetics of hydrophobic chemicals in different densities of Chlorella pyrenoidosa

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