To determine if bowfin Amia calva, spotted gar Lepisosteus oculatus, alligator gar Atractosteus spatula, and paddlefish Polyodon spathula concentrate environmental nitrite in their plasma, individuals were exposed to concentrations of 0, 10 10, or 100 mg/L nitrite-N.
Depending on where they lived, the study participants were routinely exposed to concentrations between 9.2 and 22.6 µg/m3.
"Most people at home doing floor sanding are going to be exposed to concentrations way, way in excess of that," Hay says.
The government's report to the European commission in September 2011 estimated that 698,543 people in London in 2010 were exposed to concentrations of NO2 above the WHO guideline and legal limit.
Channel catfish (75 g) were exposed to concentrations of metomidate ranging from 0.5 to 16 ppm for a period of 60 min. At 16-ppm metomidate, mortality occurred in 65% of the catfish.
The occupational health and safety of the workers in chemical plants are of great importance because they are exposed to concentrations of toxic substances that may exceed institutional limits.
The absorbance values of ctt1 treated with AgNPs were similar to control when exposed to concentrations 0.78 and 1.56 mg/L.
Phenol is lethal to most aquatic organisms exposed to concentrations of 10 to 100 ppm [1], being considered toxic to fish at a 1- to 2-ppm concentration level [2], and presents acute toxicity to man [3].
Similar observation had been made by McCarthy and Fuiman (2008) in red drum Sciaenops ocellatus exposed to concentrations of 40 and 80 μg/L of atrazine or 1 10 μg/L of malathion.
Fullerenes are found to travel to the brain, bind with lipids, and cause the production of oxidative stress compounds when fish are exposed to concentrations of only 1 ppm (Oberdorster 2004).
After 24 h of exposure in the acute toxicity tests, newborns (Figure 1) and adults (not shown) exposed to concentrations higher than 10 mg/L showed red-colored skin, especially at the encephalic region.
