Smog Inhibition Mechanism Explained
Photochemical smog formation involves complex free radical chain reactions. Key reactive species, such as hydroxyl radicals (•OH), play a crucial role in propagating these reactions.
DEHA's Role in Smog Control
Diethylhydroxylamine (DEHA) is used as an additive to inhibit photochemical smog. Its function relies on neutralizing the highly reactive species that drive smog formation.
Reaction with Hydroxyl Radicals
The primary mechanism by which DEHA inhibits smog is by reacting with and scavenging hydroxyl radicals. By removing these key chain carriers, DEHA effectively breaks the reaction cycle responsible for the buildup of pollutants like ozone and PAN.
The reaction can be simplified as:
DEHA + •OH → Non-radical products
This reaction prevents the hydroxyl radicals from initiating or propagating further harmful reactions in the atmosphere, thus reducing smog formation.
Conclusion on DEHA's Reactivity
Therefore, DEHA inhibits photochemical smog because it reacts with hydroxyl radicals, effectively acting as a radical scavenger.
Important Questions from Air and Noise Pollution
- In the determination of sulphur dioxide by p-rosaniline method, the end product is
- A point source of sound produces a noise of 70 dB at a distance of 20 m from it. What will be the noise level at 80 m from it ?
- Emission inventories involved in urban air quality assessment include parameters on
i. $SO_2$, $NO_x$, particulate matter pollutants
ii. Industry, traffic, domestic sources
iii. Fuel type, gasoline, wood as energy carrier
Choose the correct answer from codes given below : - Priority air pollutants included in the air quality index for urban areas in India are :
- Cement dust is characterized by very fine particulates. Which of the following air pollution control devices is appropriate for removing them from hot exhaust gases emanating from cement kiln ?
