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The threshold of toxilogical concern (or TTC) is a method for determining the level of exposure to chemicals above which would be considered toxic, [1] in cases where data about such chemicals is scarce or non-existent.
The threshold limit value (TLV) is a level of occupational exposure to a hazardous ... The TLV is an estimate based on the known toxicity in humans or animals ...
The threshold dose is only a measure of acute toxicity since the drug or toxic substance investigated is administered at once. The consequence of long-term administration remains unknown. [27] As the threshold dose is the measured minimal response, its accuracy heavily depends on the machinery used. It is possible that further refinement is ...
Toxicity is the degree to which a chemical substance or a particular mixture of substances can damage an organism. [1] Toxicity can refer to the effect on a whole organism, such as an animal, bacterium, or plant, as well as the effect on a substructure of the organism, such as a cell (cytotoxicity) or an organ such as the liver (hepatotoxicity).
Highly Toxic: a gas that has a LC 50 in air of 200 ppm or less. [2] NFPA 704: Materials that, under emergency conditions, can cause serious or permanent injury are given a Health Hazard rating of 3. Their acute inhalation toxicity corresponds to those vapors or gases having LC 50 values greater than 1,000 ppm but less than or equal to 3,000 ppm ...
Consumer Reports recently tested 47 bottled waters — including 35 noncarbonated and 12 carbonated options — and found levels of "toxic PFAS chemicals" in several popular brands that were above ...
Long and co-workers also [10] conducted a meta-analysis using 1068 sediment toxicity assays to evaluate the predictive ability of the ERL/ERM, PEL (predicted effects level), and TEL (threshold effects level) sediment quality guidelines. They found that the ERL most accurately predicted no-effects toxicity in benthic organisms. Furthermore, it ...
Chen C.W. and Selleck R.E. (1969) - A kinetic model of fish toxicity threshold. Res. J. Water Pollut. Control Feder. 41: 294 – 308. Straalen N.M. (1997) – How to measure no effect II: Threshold effects in ecotoxicology. Environmetrics, 8: 249 – 253. Crane M. and Newman M.C. (2000) – What level of effect is a no observed effect?