Some common air pollutants: particulates, Biology

Particulates:

These are suspended droplets, solid particles or mixture of two. So all the atmospheric substances that are not gases are called particulates.

A number of terms are used to categorize particulate depending on their size, mode of formation and physical state, some of these are:

Aerosol:  aerosol is any tiny particle of liquid or solid dispersed in atmosphere.

Dust:  small solid particle formed by breaking of soil or rock.

Fumes: these are fine solid particles formed by condensation of vapours of solid materials released by chemical or metallurgical operations.

Mist: liquid droplets formed by condensation of vapours in the atmosphere eg. H2SO4 mist.

Fog: if mist is made up of water droplets of size (1 to 40 u) and reduces visibility it is called fog.

Smoke or soot: these are the terms used to describe particles primarily composed of carbon that results from incomplete combustion.

Fly ash:  these are smaller ash particles coming along with the furnace flue gases and are basically composed of inorganic mineral.

Source:

1.      Volcanic eruption, wind and dust storm etc.

2.      Burning of wood, coal, oil and gaseous fuels.

3.      Industrial processes such as smelting and mining operations.

Effects:

Aerosols (CFC's, (NO)x, (SO)x) are released as emissions from jet aero planes and supersonic aero planes deplete the ozone layer.

Harmful effects on human life: the smaller particles (less than 10 um) capable of reaching lungs and becomes site for adsorption of carcinogenic compounds and may cause cancer. The health effects caused by different of particulate is summarized in table.

Fumes, dust, soot, mists and aerosols can bring severe damage to soil, building, sculpture and monuments.

Particulate play important role in radiation and heat balance of earth.

Particulate can absorb free radicals thus acts inhibitors of free radical chain reactions.

 Control: it can be controlled by using equipments like filters, gravity settling chamber, cyclone collectors, wet scrubbers and electrostatic precipitators etc.

Posted Date: 7/12/2012 1:47:19 AM | Location : United States







Related Discussions:- Some common air pollutants: particulates, Assignment Help, Ask Question on Some common air pollutants: particulates, Get Answer, Expert's Help, Some common air pollutants: particulates Discussions

Write discussion on Some common air pollutants: particulates
Your posts are moderated
Related Questions
Organ Systems :  Organisms are composed of organ systems. Each organ system is made up of several different organs. For example, the digestive system is composed of several organ

Explain the Minimum Requirement of nutritional needs? Minimum nutrient requirement is defined as the 'lowest amount of the nutrient ji-om the diet that will prevent clinically

BACK CROSS When F 1  individual (Tt) is crossed with one of the two parents, either tall (TT) or dwarf (tt), such a cross is called the back cross. There are two possibilities

a. Which amino acid can form disulfide bonds? b. Which level of protein structure do disulfide bonds affect? How? c. Cytoplasmic proteins rarely form disulfide bonds, even if they

"Height" is an example of a gene, but "Short" is an example of...

Equal Distribution of Hereditary Material: In mitosis the heredity material is equally distributed in the daughter cell. 2.No Change in Genetic Information: As there is no

Explain Gluconeogenesis Gluconeogenesis (i.e synthesis of  new  glucose)  is  the  synthesis of carbohydrate from  non-carbohydrate, source. The major  substrates for glucone

Explain Diagnosis of Root Perforation 1- Exploration: Continuous bleeding if the defect touched during cleaning and shaping lead to difficult vision. Difficult to d

If a person is heterozygous for the 32 allele of the CCR5 gene, how many of the four daughter cells produced by meiosis will have the 32 allele?

What are the subkingdoms into which the plant kingdom is divided? The kingdom Plantae is separated into two big subkingdoms: the bryophytes and the tracheophytes (pteridophytes