Pesticides

Pesticides
There are many types of farm chemicals in the modern world.
Under the control object can be divided into pesticide,fungicide,
rodenticide, herbicide, plant growth regulators and so on.
According to sources of raw materials can be divided into
organic pesticide,inorganic pesticide , 　microbial pesticide, botanical pesticide.Besides,there also has insect hormone.
Form the basis of processing can be divided into power,WP, granules,emulsion, fumigation agent and so on.
The majority of farm chemicals are liquids or solids and small number of gas.
According to the types of pests or diseases and the different physical properties of Pesticides .To use the different method.
I want to introduced the trait of several pesticides.
Alachlor
Molecular formula : C14H20ClNO2
Physical and Chemical Properties: white crystals, Melting point 39.5-41.5 ℃ , Boiling point 100℃(0.02mmHg)，Vapor Pressure 2.9mPa(25℃), Proportion 1.133(25 ℃)，Solubility in water 242mg/L(25 ℃)，It can dissolve in ethanol, ethyl ether, acetone, chloroform and other organic solvents. Decomposition temperature 105 ℃ and alkali conditions in the acid decomposition.
Butachlor
Molecular formula : C17H26ClNO2
Physical and Chemical Properties: Amber liquid, Melting point -5 ℃
Boiling point 156℃/0.5mmHg, Vapor Pressure 0.6mPa(25 ℃)，Proportion 1.070(25℃)，Corrosion of steel, Soluble in most organic solvents including ethyl acetate, acetone, ethanol, benzene, hexane, etc. Decomposition at 165 ℃, stability on light.
Benazoline-ethyl
Molecular formula: C11H10ClNO3S
Physical and Chemical Properties: Colorless crystalline solid Melting point: 79.2℃. Vapor Pressure 0.37mPa(25℃)，Density 1.45(20℃)，Solubility 20℃，water 47mg/L, acetone 229mg/L, dichloromethane 603mg/L, ethyl acetate 148mg/L, methanol28.5mg/L, toluene 198mg/L. Below 300 ℃, as well as
acid and neutral solution stability.
Farm chemicals is important in our lives but it also has some harm.
Some farm chemicals can takes people poisoning. For example, Organochlorine pesticides in the accumulation of fat in the body, Induction of liver enzymes, One of the reasons is swollen liver cirrhosis. Lead to cancer,arteriosclerosis , cardiovascular disease and some others disease,the very important reason is long-term consumption of contaminated vegetables.
The loss of pesticides into the environment, will cause serious environmental pollution. Sometimes resulted in extremely dangerous consequences.
1. Atmospheric pollution, water environment, resulting in soil compaction
2. Enhance the bacteria, pest resistance to pesticides
3. Anti-useful biological
4. Wildlife and livestock poisoning
At present, Synthetic chemical pesticides more than about 500, Widespread use of these pesticides. Not only caused environmental pollution and at the same time harm to human health.

Pesticides have their own legal:
The so-called pesticide is used for prevention, eradication or control of hazards in agriculture, forestry, disease, insects, grass and other harmful organisms as well as the mediation of destination plants, insect growth comes from the chemical synthesis or biological, and other natural substances, a substance or a mixture of several substances and preparations.
We have nine ways to reduce the dangers of pesticides.
1. Selection of pesticides
2. The configuration of pesticides
3. Appropriate period of the use of pesticides
4. Pesticide Application Technology
5. Pesticide safety interval
6. Security
7. Wastewater treatment
8. Total ban on the use of pesticides (23 types)
9. Restrictions on the Use of Pesticides (18 types)
As long as we use pesticides by correct ways ,it should be important thing in our lives.

Reference

http://baike.baidu.com/view/61312.htm#3