Give examples of the hazards of pesticide contamination

First of all, pesticide pollution directly endangers people's health, such as eating vegetables and fruits with high pesticide residues;

Secondly, pesticide pollution indirectly harms human health, such as pesticide polluted water, affecting plankton in the water, these plankton are eaten by fish and shrimp, pesticides will accumulate, and then be eaten by people, pesticides will accumulate twice, the more accumulation will be, the effect of pesticides will be amplified, and people and animals will be poisoned.

In addition to the harm to people, pesticides can also affect the survival of natural enemies, so that pests are more rampant.

Organophosphorus and carbamate pesticides: In recent years, acute poisoning accidents often occur every year due to the consumption of agricultural products with serious excess residues, especially vegetables and fruits that have eaten highly toxic organophosphorus pesticides and carbamate pesticides that seriously exceed the standard, which can easily cause acute poisoning, directly damage brain tissue, and lead to the death of eaters.

Pyrethroid pesticides: have estrogen-like activity. Reproductive endocrine toxicity can cause harm to the immune and cardiovascular systems.

The massive use of such chemical pesticides has caused serious pollution of the environment and serious damage to the ecological balance, thus endangering human health. In particular, the chronic and subchronic toxicity caused by low-concentration pesticides remaining in tea, grains, fruits, vegetables and other foods entering the human body cannot be ignored. It has been reported that permethrin is highly toxic to some animals such as bees and insects beneficial to humans, and has obvious toxicity to aquatic organisms such as fish and lobsters, and is easy to accumulate in organisms, and can cause liver and kidney tumors in mice.

Long-term drinking of pyrethroid pesticide residues in tea is easy to poison, and even has the hidden danger of carcinogenicity.

There are many others, add me if you want them.

1) Pollution of the atmosphere by pesticides. Sprayed pesticide particles floating in the air, or evaporating chemicals on the surface of crops, and exhaust gases from pesticide factories can pollute the atmosphere

2) Pollution of water system by pesticides. Spraying pesticides to control pests in the water, as well as spraying pesticides on crops falling on the water surface, rainwater washing pesticide-containing soil or factory waste liquid discharged into rivers will cause water pollution;

3) Soil pollution by pesticides. Pesticides that fall into the soil or apply pesticides directly to the soil to kill pests in the soil are the main causes of pesticide pollution in the soil

4) Contamination of food by pesticides. Plants and animals are contaminated during growth due to pesticide residues in the air, soil, water and feed;

5) Pollution of aquatic organisms by pesticides. Contamination of water bodies by pesticides poisons aquatic organisms, especially the food chain.

contamination of fish by pesticides;

6) Pesticide contamination of birds and beasts.

impact. Birds and others eat pesticide-containing crop seeds and grains, causing pesticides to accumulate in their bodies, resulting in a decline in reproduction rate and even death.

<> pesticide pollution refers to the pollution phenomenon formed by trace amounts of pesticide progenitors, toxic metabolites, degradation products and impurities remaining in organisms, agricultural and sideline products and the environment after pesticide use exceed the maximum residue limit of pesticides. When pesticides are lost to the environment, they will drift into the atmosphere through evaporation and transpiration, which will cause atmospheric pollution. Pesticides in the atmosphere are returned to water and soil through rainfall, which can cause water pollution and soil compaction.

1. What are the hazards of pesticide pollution?

1. Pesticide pollution refers to the pollution phenomenon formed by trace amounts of pesticide progenitors, toxic metabolites, degradation products and impurities that remain in organisms, agricultural and sideline products and the environment after pesticide use exceed the maximum residue limit of pesticides.

2. When the pesticides are lost to the environment, the pesticides are evaporated and transpired into the atmosphere, and the floating pesticides are adsorbed by the dust in the air, which will cause atmospheric pollution. Pesticides in the atmosphere flow into the water through rainfall, resulting in pollution of the water environment. At the same time, pesticides lost to the soil can also cause soil compaction.

3. Most pesticides kill all kinds of organisms without selectivity, including some beneficial animals, such as frogs, bees, earthworms, etc., and the reduction of these beneficial animals will lead to an increase in the number of pests, thus affecting agricultural production.

4. Wild animals and livestock and poultry eating food stained with pesticides will cause acute or chronic poisoning, and pesticides will affect the reproductive ability of organisms.

Second, the main measures to prevent pesticide pollution

1. Rational use of pesticides, to achieve the right medicine, master the appropriate application period and medication method, and strictly grasp the correct application amount. Create conditions to improve the efficacy of the drug and reduce the dosage, such as the improvement of the adjuvant, the improvement of the performance of the pesticide applicator, etc.

2. Reasonable mixing of pesticides, reasonable allocation and rotation of drugs, and simultaneous use of a variety of prevention and control measures. It is also necessary to understand the dynamics of pesticide residues on crops and work out the safe interval for pesticide application, so as to prevent toxic hazards in harvested agricultural products.

3. For the use of pesticides, different spraying methods should be adopted according to the characteristics of specific pesticides. For example, sodium nitrate can only act quickly at temperatures above 15, so it should be sprayed when the temperature is relatively high.

4. Measures to avoid drug cultivation can also be adopted. This can reduce the absorption rate of pesticides by crops, or can change the farming system and cultivation system, which can reduce pesticide pollution.

Answer]: The main hazards are troublesome: (1) The harm to agricultural and sideline products is mainly excessive pesticide residues. (2) The harm to the environment is mainly to become a source of water and soil pollution, and may also cause pesticide damage to crops.

Summary. Chloroform: In an acidic solution, chloroform and formaldehyde are condensed into trichloromethylformaldehyde, and the free chloroform interferes with the determination, after washing with sodium hydroxide solution, it is extracted with a mixture of sulfuric acid and perchloric acid, and perchloric acid is evaporated under reduced pressure, and then dried under reduced pressure, which can weaken the interference of chloroform.

Triethylamine: Triethylamine reacts with formaldehyde in alkaline solution to generate triethyl methyl ketone, which can also make the determination false positive, which can be washed with sodium hydroxide solution, acidified with hydrochloric acid, added with perchloric acid, washed with water and distilled under reduced pressure, removed triethylamine, and then dried under reduced pressure, which can eliminate interference. Potassium permanganate:

Potassium permanganate oxidizes formaldehyde to formic acid and can also interfere with the assay.

Hello dear. Organic pollutants, heavy metals, pesticides, mercury, cadmium, lead, etc.

Dear, it's convenient to ask, what are you growing?

What to look out for when measuring nitrogen dioxide in air.

What substances interfere with the determination of SO2 by formaldehyde absorption and pararose aniline spectrophotometry? How to eliminate?

What is Chemical Oxygen Demand? The principle of the determination of COD by potassium heavy acid method was briefly described.

How to perform sample collection and storage when determining dissolved oxygen.

When establishing the standard curve, at least a few concentration points (including zero concentration points) are prepared for the standard series solution

In the pH measurement of glass shock, in the alkaline solution with pH greater than 10, there are a large number of sodium ions, which produces an error and splits the reading (. This phenomenon is often referred to as the Imperial Reform ().

Samples should be analyzed as soon as possible and should not be left for a long time. 2.Avoid contact with water, acids or alkaline substances.

3.The sample should not be dried in an oven because the high temperature will cause it to turn into a colored substance and the shadow will be resistant to the results. 4.

Appropriate measures should be taken to maintain and increase the pH value of the reaction system within a certain range.

Chloroform: In an acidic solution, chloroform and formaldehyde are condensed into trichloromethylformaldehyde, and the free chloroform interferes with the determination, washed with sodium hydroxide solution, and then extracted with sulfuric acid-perchloric acid mixture, evaporated by reduced pressure and evaporated perchloric acid, and then dried under reduced pressure, which can weaken the interference of chloroform. Triethylamine:

Triethylamine reacts with formaldehyde in alkaline solution to generate triethyl methyl ketone, which can also make the determination state book false positive, which can be washed with sodium hydroxide solution, acidified with hydrochloric acid, added with perchloric acid, washed with water and distilled under reduced pressure, removed triethylamine, and then dried under reduced pressure, which can eliminate interference. Potassium permanganate in sail fluid: Potassium permanganate can oxidize formaldehyde to formic acid and can also interfere with the assay.

Interference. Sample: Collect water samples from plastic bottles or small-bore glass bottles.

Summary. Hello dear, I'm honored to answer for you! Chemical elements and air pollution are the most harmful to agricultural production, among which cadmium and mercury pollution affect the growth and development of crops, and after the soil is polluted by cadmium, crops can accumulate more cadmium.

There are great differences in the absorption and accumulation capacity of cadmium in different crops, such as rice, cabbage, tomato, and grape. When there is too much cadmium in the soil, plants will have green deficiency, and their growth and development will be inhibited. Rice has a black-brown leaf sheath, soybean has a brown leaf vein, and ozone is the main body of oxidative smoke, which is very toxic to plants and is very harmful to agriculture.

Especially in countries with developed agriculture, it is the most serious air pollutant that harms agriculture.

Hello dear, I'm honored to answer for you! Chemical elements and air pollution are the most harmful to agricultural production, among which cadmium and mercury pollution affect the growth and development of crops, and after the soil is polluted by cadmium, crops can accumulate more cadmium. There are great differences in the absorption and accumulation capacity of cadmium in different crops, such as rice, cabbage, tomato, and grape.

When there is too much cadmium in the soil, plants will have green deficiency, and their growth and development will be inhibited. Rice has a black-brown leaf sheath, soybean has a brown leaf vein, and ozone is the main body of oxidative smoke, which is very toxic to plants and is very harmful to agriculture. Especially in countries with developed agriculture, it is the most serious air pollutant that harms agriculture.

The air pollution soil monitoring point is centered on the air pollution source, and the distribution method is adopted.

What method is used for plots with small areas, flat terrain, and uniform levels of soil matter and contamination when soil mixed samples are collected?

In any case of soil monitoring, how many should be used in each monitoring unit? 

There is still an early crisis in the water body when the dissolved oxygen in the water is determined, and the suspended substances can be eliminated by what correction methods.

The area around the atmospheric sampling point should be open, and what should be the angle between the horizontal line of the sampling port and the height of the surrounding buildings?

Understand the status of soil contamination and what depth of soil needs to be taken for the sampling depth of cultivated land for general crops.

The soil monitoring distribution of air pollution soil monitoring points adopts the comprehensive radial, uniform, and strip distribution method when the soil mixed sample collection area is small, the terrain is flat, and the soil material and pollution degree are more uniform.

There is still an early crisis in the water body when the dissolved oxygen in the water is about to be determined, and the suspended matter can be flocculated by copper sulfate-sulfamic acid The surrounding area of the atmospheric sampling point should be open, and the angle between the horizontal line of the sampling port and the height of the surrounding buildings should not be greater than 30 If you only have a general understanding of the soil pollution status, you only need to collect 0 20cm of cultivated layer soil for cultivated land planted with general crops; For cultivated land planted with fruit crops, 0 60 cm of tillage layer soil was collected.

Excessive use of chemical fertilizers and pesticides will cause deterioration of soil properties, deterioration of product quality, environmental pollution and large gap between production and income ratio. Taking the deterioration of soil properties as an example, the application of a large number of single chemical fertilizers can easily make the soil consolidate some chemicals and form various chemical salts, resulting in the imbalance of soil nutrient structure and the deterioration of physical properties, resulting in the deterioration of soil properties.

1. What are the dangers of excessive use of chemical fertilizers and pesticides?

1. Deterioration of soil properties.

1) If a large number of single-element chemical fertilizers are applied in farmland, their nutrients can not only be absorbed and utilized by crops, but also some chemicals such as nitrogen, phosphorus, and potassium are easy to be consolidated by the soil to form various chemical salts.

2) If the content of chemical salt in the soil is too high, it will cause the imbalance of soil nutrient structure, the deterioration of physical properties, and the content of harmful metals and harmful bacteria in some plots will exceed the standard, resulting in the deterioration of soil properties.

2. Product quality declines.

1) When planting crops, if a certain chemical fertilizer is applied, it will lead to crop nutritional imbalance, and the transformation and synthesis of some substances in the body will be blocked, resulting in a decrease in product quality.

2) Too much chemical fertilizer will cause melons and fruits to be unsweet and vegetables not fragrant.

3. Environmental pollution.

1) Excessive amount of chemical fertilizer will cause soil water-soluble nutrients and other substances to flow into groundwater and rivers after being washed by rainwater and farmland irrigation, resulting in groundwater and river pollution in some areas.

2) Fish and shrimp in some rivers and lakes will also die.

4. The gap between production and income ratio is large.

1) Excessive application of a single fertilizer will cause crop nutrient imbalance, nutrient imbalance, only increase the cost but not increase the yield, resulting in low-quality agricultural products are not easy to sell or low, thus bringing losses to farmers.

2) Restricted by factors such as the level of cultivation and the amount of fertilizer required by crops, crops cannot obtain high yields, which affects farmers' income.

2. What are the hazards of pesticide pollution?

1. Soil pollution.

Due to the large-scale, large-scale use and abuse of pesticides, coupled with the non-degradability of pesticides, it has caused serious pollution to the earth.

2. Environmental pollution.

1) Pesticides are generally commonly used in spray, and the organic solvents and some pesticides in pesticides will float in the air and directly pollute the atmosphere.

2) When pesticides are washed away by rainwater, pesticides can enter rivers and pollute the oceans.

3) Some pesticides remain for a long time, and these pesticides will enter the deep ground through soil infiltration, thereby polluting groundwater.

3. Ecological destruction.

1) The use of pesticides in large quantities will kill and injure the natural enemies of many pests, destroy the ecological balance of nature, and lead to serious pests and diseases, such as spider mites, leafhoppers and various soil-borne diseases.

2) Pesticides not only cause the rapid reproduction of pests, but also affect the birds, fish, frogs and other organisms that depend on insects, resulting in ** incidents.