Ecotoxicological study of Lithuanian and Estonian wastewaters: selection of the biotests, and correspondence between toxicity and chemical-based indices

Manusadžianas, Levonas; Balkelyt, L; Sadauskas, Kazys; Blinova, Irina; Põllumaa, Lee; Kahru, Anne

doi:10.1016/s0166-445x(02)00132-7

Cited by 87 publications

(52 citation statements)

References 14 publications

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“…However, findings that confound these results are also frequently reported. For example, a large-scale study on potential harmfulness of industrial and urban wastewaters containing both metals and various organic pollutants [45] A bioluminescence (BL) inhibition assay is often chosen as the first screening method in a test battery, based on the speed and cost considerations [1]. However, since the bacterial assays tend to be, as it has been shown in our study, less sensitive to some of the important environmental pollutants such as heavy metals, the screening of environmental samples with V. fischeri or P. putida tests might result in false negatives and lead to flawed conclusions about the potential risks.…”

Section: Applicability Of Bacterial Tests To Assessment Of Environmenmentioning

confidence: 99%

Sensitivity of bacterial vs. acute Daphnia magna toxicity tests to metals

et al. 2009

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The objectives of this study were to evaluate the sensitivity of two bacterial tests commonly used in metal toxicity screening — the Vibrio fischeri bioluminescence inhibition test and the Pseudomonas putida growth inhibition test — in comparison to the standard acute Daphnia magna test, and to estimate applicability of the selected methods to the toxicity testing of environmental samples. The D. magna acute test proved to be more sensitive to cadmium (Cd), zinc (Zn) and manganese (Mn) than the two bacterial assays, whereas P. putida seems to be the most sensitive species to lead (Pb). Manganese appears to be slightly toxic to D. magna and non-toxic to the two selected bacteria. This leads to the conclusion that even in regions with high background concentrations, manganese would not act as a confounding factor. Low sensitivity of V. fischeri to heavy metals questions its applicability as the first screening method in assessing various environmental samples. Therefore, it is not advisable to replace D. magna with bacterial species for metal screening tests. P. putida, V. fischeri and/or other bacterial tests should rather be applied in a complex battery of ecotoxicological tests, as their tolerance to heavy metals can unravel other potentially present toxic substances and mixtures, undetectable by metal-sensitive species.

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Section: Applicability Of Bacterial Tests To Assessment Of Environmenmentioning

confidence: 99%

Sensitivity of bacterial vs. acute Daphnia magna toxicity tests to metals

et al. 2009

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“…Chemical evaluations, associated with toxicological studies, may be applied to several processes. 16,17 Due to the complexity of the aquatic ecosystems and the multifunctionality of toxicity tests, they may be carried out with a large variety of biological species at different trophic levels. Living organisms are almost always exposed to possibly genotoxic environmental agents both at cellular and molecular levels.…”

Section: Introductionmentioning

confidence: 99%

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Garcia¹,

Simionato²,

Almeida³

et al. 2009

J. Braz. Chem. Soc.

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). Em relação à toxicidade apresentada pelos produtos formados durante a degradação perante as sementes de alface (Lactuca sativa) os dados sugerem que não foi apresentada toxicidade considerável, uma vez que não houve redução significativa da porcentagem de germinação nem influência na porcentagem de crescimento das raízes e radículas, contudo, a associação TiO 2 /H 2 O 2 apresenta maior toxicidade nas primeiras horas de irradiação e posterior redução da mesma ao final de seis horas, enquanto que o TiO 2 somente aumenta um pouco sua toxicidade no final dos experimentos. Porém, comparados ao efluente bruto, ambos apresentaram redução de toxicidade, ou seja, os produtos fotogerados apresentam-se menos tóxicos que o efluente inicial.Textile industry wastes raise a great concern due to their strong coloration and toxicity. The objective of the present work was to characterize the degradation and mineralization of textile effluents by advanced oxidative processes using either TiO 2 or TiO 2 /H 2 O 2 association and to monitor the toxicity of the products formed during 6 h irradiation in relation to that of the in natura effluent. The results obtained demonstrated that the TiO 2 /H 2 O 2 association was more efficient in the mineralization of textile effluents than TiO 2 alone, with high mineralized ion concentrations (NH 4 + , NO 3 -, and SO 4 2-) and significant organic matter reduction rates (represented by the COD and TOC). The toxicity of the degradation products to lettuce seeds (Lactuca sativa) was not significant, since percent germination was not significantly affected and neither was root and sprout percent growth. However, while the TiO 2 /H 2 O 2 association was more toxic in the first hours of irradiation and less so in the end of the 6 h irradiation, the toxicity of TiO 2 increased only slightly in the end of the experiments. Comparatively, the photogenerated products of both the TiO 2 and the TiO 2 /H 2 O 2 association were less toxic than the in natura effluent.

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“…The toxicity of industrial and urban wastewater samples have previously been tested by other authors and it was found that Nitellopsis obtusa and Thamnocephalus platyurus were very sensitive followed by Vibrio fischeri [14]. Comparing the acute and chronic toxicity of 30 different effluents to two crustacean species Daphnia magna and Thamnocephalus platyurus, bacteria Vibrio fischeri and algae Pseudokirchneriella subcapitata the bacteria V. fischeri revealed the highest sensitivity followed by P. subcapitata [15].…”

Section: Effluent From Industrymentioning

confidence: 94%

Toxicity assessment of effluents

Tišler¹,

Zagorc-Kon²

2008

WIT Transactions on Ecology and the Environment

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Experiences have shown that the effective control of effluent discharges has contributed to continuous improvement of the receiving waters. An important intrinsic property of effluent is toxicity, which should be properly evaluated to protect the aquatic ecosystems. Previous experiences have shown that identification of individual potentially toxic substances has many limitations. Nowadays, an integrated strategy is used in programmes for monitoring the quality of effluent discharges, which involves chemical determinations as well as toxicity tests. In Slovenian regulations, acute toxicity assessment using water fleas is a standard part of the monitoring programme for effluents discharging into receiving streams if toxic compounds in the effluent are expected. The aim of this study was to assess the adequacy of the daphnid acute toxicity test for characterisation of effluents containing different hazardous chemicals. In most cases Daphnia magna was found to be very sensitive to toxic effluents in comparison to luminescent bacteria Vibrio fischeri, algae Desmodesmus subspicatus and fish Danio rerio. However, in some cases, other organisms were more sensitive than daphnids, for example algae D. subspicatus when exposed to effluent from the chemical industry. Our results show that using a battery of test species and endpoints results in more reliable and comprehensive quality assessment of effluents discharging into receiving streams.

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Ecotoxicological study of Lithuanian and Estonian wastewaters: selection of the biotests, and correspondence between toxicity and chemical-based indices

Cited by 87 publications

References 14 publications

Sensitivity of bacterial vs. acute Daphnia magna toxicity tests to metals

Sensitivity of bacterial vs. acute Daphnia magna toxicity tests to metals

Evolutive follow-up of the photocatalytic degradation of real textile effluents in TiO2 and TiO2/H2O2 systems and their toxic effects on Lactuca sativa seedlings

Toxicity assessment of effluents

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