water toxicity sample Articles
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The Toxicity Identification of Inorganic Toxicants in Real World Samples
Abstract :The toxicity of a sediment pore water and an effluent was characterized using Toxicity Identification Evaluation (TIE) procedures. 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 ...
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Monitoring the aquatic toxicity of mosquito vector control spray pesticides to freshwater receiving waters
Pesticides are applied to state and local waterways in California to control insects such as mosquitoes, which are known to serve as a vector for West Nile Virus infection of humans. The California State Water Resources Control Board adopted a National Pollutant Discharge Elimination System General Permit to address the discharge of pesticides to waters of the United States resulting from ...
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Use of Microbiotests to Compare the Toxicity of Water Samples Fortified with Active Ingredients and Formulated Pesticides
Abstract: In Portugal rice occupies a relevant position among other irrigated crops and, since treated water is frequently discharged to the surrounding water bodies, field studies to determine the influence of pesticides used in rice treatments to aquatic biota are being performed. In order to better understand the toxicity results obtained in field conditions, particularly the influence of the ...
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Heavy metals, PAHs and toxicity in stormwater wet detention ponds
Concentrations of 6 different heavy metals and total polycyclic aromatic hydrocarbons (PAHs) were determined in stormwater runoff and in the pond water of two Danish wet detention ponds. The pond water samples were analyzed for toxic effects, using the algae Selenastrum capricornutum as a test organism. Stormwater and pond water from a catchment with light industry showed high levels of heavy ...
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Determination of toxic heavy metals in sea water by FAAS after preconcentration with a novel chelating resin
A solid phase extraction procedure was developed for preconcentration of toxic heavy metals such as cadmium, cobalt, copper, manganese, lead and zinc in sea water samples. A microcolumn packed with 6-[(4-hydroxyphenyl)diazenyl]naphthalene-2,3-diol-formaldehyde (HPDN-F) resin acts as a sorbent to retain the analyte ions by forming metal chelates. The retained trace level metal was subsequently ...
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Characterisation of antimony, arsenic, cadmium, copper and tin occurrences at an abandoned sulphide-mining area
Contamination levels in top-soil, vascular plant and surface water samples from the Sao Domingos mining area, Portugal, were determined by Instrumental Neutron Activation Analysis (INAA) and Compton-Suppression Neutron Activation Analysis (CSNAA). The total levels of As, Cd, Cu, Sb and Sn are reported with a discussion of plant uptake and transfer coefficients. Comparative analysis of the same ...
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Zero-valent aluminum-mediated degradation of Bisphenol A in the presence of common oxidants
The use of a commercial, nano-scale zero-valent aluminum (ZVA) powder was explored for the treatment of aqueous Bisphenol A (BPA). The study focused on the (i) activation of hydrogen peroxide (HP) and persulfate (PS) oxidants with ZVA to accelerate BPA degradation, (ii) comparison of the treatment performance in pure and real surface water (SW) samples, (iii) effects on toxicity and (iv) ...
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Application of species sensitivity distribution in aquatic probabilistic ecological risk assessment of cypermethrin: A case study in an urban stream in South China
A tiered ecological risk assessment (ERA) was applied to quantitatively refine the overall probabilistic risk of cypermethrin, a pyrethroid insecticide, to aquatic organisms. These results were then validated through the bioassays using field water from an urban stream, Chebei Creek in Guangzhou, South China. Seventeen water samples were collected along Chebei Creek for evaluation. In total, ...
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Utility of the laser particle counter for determination of drinking-water toxicity
Particle toxicity in various water samples depends on the mixture of toxicants in each sample. Toxicity values for different samples can be expressed using the new metric: Particle Toxicity. Use of the Spectrex PC-2000 was the instrument of choice in enumerating the particle concentrations for the calculation of the particle toxicity of drinking-water and reference toxicant suspensions. ...
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Development of a regression model to predict copper toxicity to Daphnia magna and site‐specific copper criteria across multiple surface‐water drainages in an arid landscape
The water effect ratio (WER) procedure developed by the U.S. Environmental Protection Agency is commonly used to derive site‐specific criteria (SSC) for point‐source metal discharges into perennial waters. However, experience is limited with this method in ephemeral and intermittent systems typical of arid climates. This study presents a regression model to develop WER‐based SSC for a network ...
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Toxicity Determination of the Sediments of the River Seine in France by Application of a Battery of Microbiotests
Abstract : This study reports on the potential of the Toxkit microbiotests and the bacterial luminescence test Microtox®, to detect and quantify the toxicity of the sediments of the river Seine and a few tributary rivers in France. The objective of the research was to try to identify a minimum test battery for routine toxicity screening of river sediments. Attempts were also made to correlate ...
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