GK
ECOLOGY BIODIVERSITY CONSERVATION ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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BOD
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Nitrates
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Silica
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Chlorides
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Detailed explanation-1: -Probably the best indicator of leachate contamination is the pH of the well water. These pH values range from 3.5 to 7.1. Most wells exhibit pH values between 4 and 6. Some wells also have lead levels as high as 0.44 mg/L (ppm).
Detailed explanation-2: -Availability, mobility, persistence, analyticity and contrast of concentrations in leachate and ground water are important factors to consider in selection of an indicator. Boron, iron, ammonia and total dissolved solids appear to be reliable parameters for indicating ground-water pollution by leachate.
Detailed explanation-3: -underground storage tank is not a major source of groundwater contamination.
Detailed explanation-4: -Examples of this are road salt, petroleum products leaking from underground storage tanks, nitrates from the overuse of chemical fertilizers or manure on farmland, excessive applications of chemical pesticides, leaching of fluids from landfills and dumpsites, and accidental spills.