10.3 Pesticides

2.1 Pollutant
2.2 Contaminant
2.3 Source
2.4 Sink
2.5 Receptor
2.6 Threshold limit value (TLV)
2.7 Flow sheet of Environmental pollution process
2.8 Atmospheric Pollution
2.9 Tropospheric pollution or Air pollution

3.1 Primary pollutants
3.2 Particulate Matter
3.3 Inorganic gases
3.4 Secondary Pollutants
3.5 Major air pollutants

6.1 Role of Ozone Layer
6.2 Depletion of Ozone Layer

7.1 Chemistry of acid rain
7.2 Harmful effect of acid rain

8.1 Green house effect around the earth
8.2 Advantages of green house effect
8.3 Harmful effects of green house effect
8.4 Water Pollution

10.1 Control of water pollution
10.2 Land Pollution
10.3 Pesticides
10.4 Control of soil pollution
10.5 Green Chemistry: A new route to protection of environment

Pesticides are substances that are used to kill or block the reproductive processes of unwanted organisms. Synthetic pesticides are of concern to us, because of the possible effect upon human health through eating of food or drinking water, contaminated with these chemicals. Most pesticides can put into one of three categories:

Control of insects by insecticides helps to curb disease and protect crops. Organo chlorines are a group of compounds which have been developed and used as insecticides. The best known organochlorine compound is DDT (dichlorodiphenyl trichloro ethane) organo chlorines are stable in the environment, toxic to insects in small amounts, but much less go to humans, and because they are organic compounds not very soluble in water. The advantage of these insecticides is that, bring persistent, they show their biological activity for long periods of time. On the nexampleative side, these insecticides by accumulating in the environment also affect many non – target organisms, not just the target pests.

Fungicides are used to check the growth of fungi. Fungi, are plants without chlorophyll, they cannot use solar energy for preparing their food. They live as saprophytes on decaying organic matter or as parasites at the expense of living organisms. Hence they are considered to be a threat to human interests. Fungicides are important because they check the growth of fungi. Organic compounds of Mercury have been used as fungicides. These compounds break down in soil and thus have many disastrous consequences.