US EPA

7408798 

Journal Article 

Evaluation of p-dichlorobenzene emissions from solid moth repellant as a source of indoor air pollution 

Chang, JC; Krebs, KA 

1992 

42 

9 

1214-1217 

English 

BIOSIS COPYRIGHT: BIOL ABS. The para-dichlorobenzene emission rates from mothcakes were measured in dynamic chambers and an IAQ test house. The dynamic chamber data can be described by a model which assumes that the emission rate was controlled by gas-phase mass transfer. The mass transfer driving force was the difference between the para-dichlorobenzene vapor pressure at the chamber temperature and the gas-phase para-dichlorobenzene concentration in the chamber. The model was verified by static chamber tests, which measured the vapor pressure of para-dichlorobenzene, and the linear relationship between the inverse of steady state dynamic chamber concentration and the air exchange rate. In the IAQ test house, thepara-dichlorobenzene emission factor (emission rate per unit area of the mothcake) became directly proportional to its vapor pressure and the mass transfer coefficient. Forced convection, probably due to the natural gas heating, affected the mass transfer at various locations and the para MH - CLIMATE 

ECOLOGY; METEOROLOGICAL FACTORS; BIOCHEMISTRY; ENVIRONMENTAL POLLUTANTS/POISONING; OCCUPATIONAL DISEASES; AIR POLLUTION; SOIL POLLUTANTS; WATER POLLUTION; HERBICIDES; PEST CONTROL; PESTICIDES; ARACHNIDA; ENTOMOLOGY/ECONOMICS; INSECTICIDES; Biochemical Studies-General; Toxicology-Environmental and Industrial Toxicology; Public Health: Environmental Health-Air; Economic Entomology-Chemical and Physical Control; Invertebrata; 106-46-7