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At 1 ppm the solution is a very pale yellow. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. In science and engineering , the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or ...
mg/m 3 = milligrams of pollutant per cubic meter of air at sea level atmospheric pressure and T: ppmv = air pollutant concentration, in parts per million by volume T = ambient temperature in K = 273. + °C 0.082057338 = Universal gas constant in L atm mol −1 K −1: M = molecular mass (or molecular weight) of the air pollutant
Atmospheric pollutant concentrations expressed as mass per unit volume of atmospheric air (e.g., mg/m 3, μg/m 3, etc.) at sea level will decrease with increasing altitude because the atmospheric pressure decreases with increasing altitude. The change of atmospheric pressure with altitude can be obtained from this equation: [2]
The abundance of elements in Earth's crust is shown in tabulated form with the estimated crustal abundance for each chemical element shown as mg/kg, or parts per million (ppm) by mass (10,000 ppm = 1%).
82,6 mg/kg 11 ppm/1h 25 mg/kg Mouse 40 mg/kg 296 g/m 3 /2h 10 mg/kg 56 mg/kg Rabbit 1410 mg/kg Guinea Pig 500 μL/kg 50 μg/24h [7]
1600 mg/kg (rat, oral) 1600 mg/kg (mouse, oral) [4] LC Lo (lowest published) 50,000 ppm (guinea pig, 50 min) ... TWA 150 ppm (530 mg/m 3) [3] IDLH (Immediate danger)
2050 mg/kg (oral, rat) [3] LC 50 (median concentration) >3500 ppm (mouse, 4 hr) [3] 1030 ppm (rat, 8 hr) [3] ... 5.6 ppm (30 mg/m 3) [15 min] [1] IDLH (Immediate danger)
The LD 50 to rats through the oral exposure route is 366 mg/kg. [7] In regards to occupational exposures to n-butylamine, the Occupational Safety and Health Administration and National Institute for Occupational Safety and Health have set occupational exposure limits at a ceiling of 5 ppm (15 mg/m 3) for dermal exposure. [8]