Colorimetric method for the determination of ethylene dibromide residues in grains and air.
A method based on the hydrolytic debromination of ethylene dibromide (EDB) in the presence of an oxidizing agent has been developed. Bromine liberated from inorganic bromide is used to brominate p-rosaniline. The intensity of the resulting violet-red bromo compound in chloroform is measured at 580 nm. The relationship between absorbance and concentration of EDB is linear in the range of 5-60 mug. The method is very sensitive and as little as 0.50 ppm unchanged EDB residue in a 20 g sample of fumigated grain and 1 ppm EDB in a 10 ml air sample can be detected.
D000393:Air Pollutants / Q000032:analysis*; D003124:Colorimetry; D002523:Edible Grain / Q000032:analysis*; D015946:Ethylene Dibromide / Q000032:analysis*; D006842:Hydrocarbons, Brominated / Q000032:analysis*; D008722:Methods; D010573:Pesticide Residues / Q000032:analysis*
D000393:Air Pollutants; D006842:Hydrocarbons, Brominated; D010573:Pesticide Residues; D015946:Ethylene Dibromide