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Toxicity Sampling Articles & Analysis
92 articles found
Stricter Collection Procedures The US EPA has defined a new series of procedures that utilities must perform when collecting samples for metal screening analysis. The LCRR adds a requirement of collecting samples in wide-mouth bottles. More significantly, collection of the fifth-liter sample in homes with lead service lines (LSLs) after water has ...
Likewise, it may be about low BOD/DQO ratio, either because the BOD is really low or also due to a toxic effect that the sample has been generating during the BOD test performance. In fact, this same toxic effect can be translated to the bCOD/DQO (Biodegradable COD / COD) where, by varying the ratio [sample volume/ sludge ...
However, if there are relatively high levels of other toxic pollutants in the sample such as heavy metals, the microbes in the water will be inhibited or “poisoned,” and will not consume as much oxygen as they would in cleaner water with the same amount of nutrients or food. ...
Abstract : Aquatic microbiotests were selected and evaluated for their potential usefulness in measuring ecotoxicity in monitoring programs. Microbiotests are tests with aquatic invertebrates that demand a shorter exposure period and a smaller test volume than conventional aquatic ecotoxicity test methods. Microbiotests evaluated were the Thamnotox F test, the Rotox F test, the Algaltoxkit F ...
Abstract : The chemical composition and toxicity of five phenolic wastewaters samples collected from the Kohlta-Järve (Estonia) oil-shale industry region were analysed. ...
Four leachates retained their toxicity to lettuce, despite a 6-months storage at 4° C. These samples were subject to further toxicity characterization. ...
The most sensitive bacterial assays (Toxi-ChromoPad and ECHA Biocide Monitor) were able to detect acute toxicity in most samples. Another bacterial assay, MetPAD, responded positively to the presence of metals. ...
Both samples exhibited acute toxicity to the freshwater crustaceanThamnocephalus platyurus. The TIE approach was conducted using an enlarged battery of fractionation tests. Toxicity of the pore water sample was removed or reduced significantly by the cation exchange procedure and the air-stripping test at pH 11. ...
Abstract : Conventional algal tests have not been utilized to their full potential for routine toxicity assessments. This is mainly due to the complexicity of these assays and the fact that many operators are still encountering practical difficulties. ...
Toxicity of the samples was expressed as German regulatory G-values and Toxic units (TU). The results of these studies indicate that high toxicity was observed in samples with a short treatment period. In most cases toxicity decreased significantly when the duration of treatment increased. ...
Abstract : The acute toxicity of 42 samples of different types of domestic and industrial discharges was assessed with a battery tests comprising the standard Daphnia magna bioassay and three cost-effective new microbiotests (cyst-based Toxkits) : the Rotoxkit F with the freshwater rotifer Brachionus calyciflorus and the Streptoxkit F and Thamnotoxkit F tests ...
For samples in which toxicity was detected, Microtox responses were compared with the results of a battery of tests including conventional bioassays (algal growth inhibition, Daphnia magna acute test) and microbiotests (Rotoxkit F™and Thamnotoxkit F™). These additional bioassays generally confirmed the toxicity detected by the ...
They were tested with 2 defined mixtures of chemicals. One mixture contained toxicants with a non-specific mode of action and the other pesticides. ...
In addition, the toxicity of groundwaters from 2 wells near 2 waste dumps was also assessed. All the drainage waters of the waste dumps and the groundwaters near one dump (an unprotected landfill) showed toxic effects on all the test species, for samples taken in spring as well as in autumn. The well water of the (more recent) waste dump of the ...
A battery of biotests was applied to study the toxicity of environmental wastewaters and their synthetic phenolic analogues. The battery consisted of 3 crustacean tests (Daphtoxkit F™ magna, Daphtoxkit F™ pulex, Thamnotoxkit F™), one protozoan test (Protoxkit F™), one rotifer test (Rotoxkit F™), one algal test (Algaltoxkit F™) and 3 ...
From all the freshwater stations on the Seine, only one did not give a toxic signal with any of the microbiotests used. No toxicity was detected either in 2 out of the 7 stations on the tributary rivers, nor in the 3 estuarine pore waters. In most stations, toxic efects were observed with several if not all of the microbiotests of the battery, ...
Abstract :Chemical analyses and toxicity test results for atmospheric wet and dry deposition from 5 sampling sites in Greece are presented in this study. In most of the samples examined, the heavy metals content of the filtered water samples was relatively low. ...
A fractionation technique based on SPE C-18 cartridges was developed allowing to separate and recover fractions selectively containing cyanobacterial hepatotoxins. Two samples of cyanobacterial biomass (both crude extract and toxic fraction) were tested for toxicity with a battery of 7 different toxicity microbiotests with ...
Hence, it is necessary to find alternative assays to detect and quantify cyanobacterial hazards. This study reports on the toxicity of 7 cyanobacterial bloom samples from the Jeziorsko Reservoir in central Poland as determined with 4 microbiotests : the Thamnotoxkit F™, the Daphtoxkit F™ magna, the ProtoxkitF™ and the Spirotox. The ...
Abstract : This preliminary study reports on the toxicity of surface waters collected twice in 1997 (once in late spring and once in late autumn) at 19 sampling stations in 5 areas (Domitian, Flegrean, Regi Lagni, Vesuvian and Coast area) in the Province of Naples in Italy. The acute toxicity of the surface waters was determined with a battery ...