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What Is Water Pollution

Water pollution occurs when harmful pollutants are discharged directly or indirectly into water bodies without adequate treatment. This contamination affects plants and organisms living in these bodies of water. There are several ways water becomes polluted, including industrial and mining waste, agricultural runoff containing pesticides and fertilizers, and sewage from domestic and farm sources. Water pollution can be analyzed through physical, chemical and biological testing methods to measure factors like temperature, dissolved oxygen levels, nutrient levels, and presence of metals, oils or pathogens. Samples are collected and undergo specialized tests to determine the nature and extent of contamination.

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76 views3 pages

What Is Water Pollution

Water pollution occurs when harmful pollutants are discharged directly or indirectly into water bodies without adequate treatment. This contamination affects plants and organisms living in these bodies of water. There are several ways water becomes polluted, including industrial and mining waste, agricultural runoff containing pesticides and fertilizers, and sewage from domestic and farm sources. Water pollution can be analyzed through physical, chemical and biological testing methods to measure factors like temperature, dissolved oxygen levels, nutrient levels, and presence of metals, oils or pathogens. Samples are collected and undergo specialized tests to determine the nature and extent of contamination.

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WHAT IS WATER POLLUTION? Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater).

Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful compounds. Water pollution affects plants and organisms living in these bodies of water. In almost all cases the effect is damaging not only to individual species and populations, but also to the natural biological communities. EXAMPLES OF WATER POLLUTION
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Industrial affluents Water is discharged from after having been used in production processes. This waste water may contain acids, alkalis, salts, poisons, oils and in some cases harmful bacteria.

Mining and Agricultural Wastes Mines, especially gold and coal mines, are responsible for large quatities of acid water. Agricultural pesticides, fertilisers and herbicides may wash into rivers and stagnant water bodies.

Sewage Disposal and Domestic Wastes Sewage as wel as domestic and farm wastes were often allowed to pollute rivers and dams.

HOW DO YOU KNOW THAT THE WATER IS POLLUTED? Water pollution may be analyzed through several broad categories of methods: physical, chemical and biological. Most involve collection of samples, followed by specialized analytical tests. Some methods may be conducted in situ, without sampling, such as temperature. Government agencies and research organizations have published standardized, validated analytical test methods to facilitate the comparability of results from disparate testing events.[19]

Sampling
Sampling of water for physical or chemical testing can be done by several methods, depending on the accuracy needed and the characteristics of the contaminant. Many contamination events are sharply restricted in time, most commonly in association with rain events. For this reason "grab" samples are often inadequate for fully quantifying contaminant levels. Scientists gathering this type of data often employ auto-sampler devices that pump increments of water at either time or discharge intervals.

Sampling for biological testing involves collection of plants and/or animals from the surface water body. Depending on the type of assessment, the organisms may be identified for biosurveys (population counts) and returned to the water body, or they may be dissected for bioassays to determine toxicity.

Physical testing
Common physical tests of water include temperature, solids concentration (e.g., total suspended solids (TSS)) and turbidity.

Chemical testing
Water samples may be examined using the principles of analytical chemistry. Many published test methods are available for both organic and inorganic compounds. Frequently used methods include pH, biochemical oxygen demand (BOD),[20] chemical oxygen demand (COD),[21] nutrients (nitrate and phosphorus compounds), metals (including copper, zinc, cadmium, lead and mercury), oil and grease, total petroleum hydrocarbons (TPH), and pesticides.

Biological testing
Biological testing involves the use of plant, animal, and/or microbial indicators to monitor the health of an aquatic ecosystem.

RESEARCH IN SCIENCE III


WATER POLLUTION MRS. LOURDES MEJIA

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