Ppm Nitrogen Oxides Research Articles

Quantification of Cholesterol Oxidation Products In Egg Yolk Powder Spray‐dried with Direct Heating

ABSTRACTA direct‐heated spray dryer with an evaporative capacity of up to 7 kg H2O/hr was used to identify processing conditions responsible for formation of cholesterol oxidation products (COPS) in spray‐dried egg yolk. Outlet air temperature and nitrogen oxides (NOx) in the combustion gases were the only conditions that affected COPS levels. At outlet temperature 150°C, total COPS concentrations in the spray‐dried product were 75 ppm at 5 ppm NOx and 213 ppm at 300 ppm NOx. In products dried at 75°C outlet temperature, total COPS concentrations were 21 ppm at 5 ppm NOx and 58 ppm at 300 ppm NOx. In general, individual COPS responded to outlet temperature and NOx in the same manner as total COPS.

A NEW DRY-TYPE ADSORBENT OF CHELATE RESIN-IRON(II) COMPLEXES. PREPARATION AND ADSORPTION OF NITROGEN OXIDE

Abstract A new dry-type adsorbent was prepared by washing the chelate resin beads holding iron(II) with a hydrophilic organic solvent, followed by vacuum drying. It adsorbed more than 99% of nitrogen oxide from 6 dm3 of nitrogen gas containing 980 ppm nitrogen oxide in 25 min. The nitrogen oxide adsorbed on the adsorbent was able to be desorbed by raising temperature up to 100 °C under vacuum.

CHELATE RESIN-IMMOBILIZED IRON(II) COMPLEXES AS NEW NITROGEN OXIDE ADSORBENTS

Abstract Iron(II) ions were immobilized on the chelate resin by treating crosslinked polystyrene beads involving iminodiacetic acid moieties with iron(II) sulfate in water. The resin-immobilized Fe(II) complexes, especially those prepared with fine beads, can adsorb nitrogen oxide rapidly in water from nitrogen atmosphere containing 1000 ppm nitrogen oxide.

Lead, cadmium, iron, zinc, copper, manganese, calcium and magnesium in spf male rats exposed to a dilution of automotive exhaust gas throughout their lives

Male pathogen free CFE albino Sprague Dawley rats were exposed 8 h per day, 5 days per week, for three years to a 1/1000 dilution of automotive exhaust gas, containing 58 ppm carbon monoxide, 0.37% carbon dioxide, 23 ppm nitrogen oxides, 2 ppm aldehydes, less than 5 mg/l hydrocarbons and 8.5 μg/m 3 lead. Lead, cadmium, iron, zinc, calcium and magnesium were measured by atomic absorption in the femurs and tibias of the rats which died during the experiment. A comparison with two control groups revealed that the only significant difference in the elements measured in the bones was a 500% increase in lead concentration. The calculations of the correlations between the percentages of the elements in bones, the ages and the body weights of the rats, as well as cluster analysis, did not show consistent variations of the water, calcium, magnesium concentrations nor of the other studied metals related to this increase in lead concentration. Moreover, longevity was the same in the 3 groups of rats, but the body weight was statistically smaller (4%) in the group exposed to the auto exhaust dilution.