What pesticide residue lasts the longest and how long is the residue time of pesticides in general

There are many kinds, and pesticides are generally longer. The residue period of fungicides is generally 2-7 days, the residue period of fungicides is generally 2-7 days, and the residue period of acaricides is generally 7-14 days. Among them, the residual period of 75% chlorothalonil wettable powder of fungicide is 7 days, and that of 50% Nonliling wettable powder is 4-5 days; The residue period of insecticide 35% excellent thiophos is 7 days; The residual period of 50% bromine fungicide is generally 2-7 days, the residual period of fungicide is generally 2-7 days, and the residual period of acaricide is generally 7-14 days.

Among them, the residual period of 75% chlorothalonil wettable powder of fungicide is 7 days, and that of 50% Nonliling wettable powder is 4-5 days; The residue period of insecticide 35% excellent thiophos is 7 days; The residual period of acaricide 50% bromodifen emulsifiable concentrate is 14 days. The residual period of acarophil EC is 14 days.

There are many types of pesticide residues, and among the highly toxic pesticides, organophosphorus, heavy metals (mercury, arsenic preparations) and organochlorines are the most.

The most common manifestation of organophosphorus pesticides after accidental ingestion is that mild cases will cause dizziness, headache, nausea and vomiting, drooling, sweating, blurred vision, fatigue, numbness and purple lips and other symptoms.

The remaining pesticide residues that do not have direct manifestations after ingestion will indirectly cause heavy metal poisoning, such as mercury poisoning and arsenic poisoning, and excessive metal in children will also cause ADHD.

The varieties of highly toxic and high-residue pesticides are: six.

Six. 6. DDT, toxaphene, dibromochloropropane, amidine, dibromoethane, herbicide, aldrin, dieldrin, mercury preparations, arsenic, lead, dichlorbis, fluoroacetamide, glycofluoride, rat poison, sodium fluoroacetate, rat silicon, methamidophos, parathion, etc.

The pesticide safety interval refers to the period from the last application to grazing, harvesting (harvesting), use, and consumption of crops, and the interval required from spraying to the maximum allowable residue reduction. When using drugs in orchards, the interval between the last spraying and harvest must be greater than the safe interval to prevent poisoning of humans and animals.

1 Fungicides.

75% chlorothalonil wettable powder to be used 7 days before marketing;

77% can kill wettable powder for 3-5 days;

50% promethexin wettable powder for 4-7 days;

70% methyl tobuzine wettable powder for 5-7 days;

50% Nonliling WP for 4-5 days;

50% Garry 58% Rhizin manganese-zinc wettable powder for 2-3 days;

64% alum wettable powder for 3-4 days.

2 Pesticides.

10% deltamethrin EC for 2-5 days;

2 days for bromopermethrin;

Kung Fu emulsifiable concentrate for 7 days;

5% Leflin EC for 3 days;

5% anti-aphid wettable powder for 6 days;

10% Fast Kill EC for 3 days, Lesben EC for 7 days;

3 days for 20% emulsifiable concentrate and 5 days for 20% fenvalerate emulsifiable concentrate;

The 35% thionphos period is 7 days;

20% deltamethrin EC for 3 days;

10% mapelik EC for 7 days;

quinthion 25% emulsifiable concentrate for 9 days;

50% anti-aphid wettable powder for 6 days;

5% multi-Plebro WP for 7 days.

3 Acaricides.

50% bromodifen EC for 14 days;

50% Tork WP for 7 days.

When some vegetable farmers use pesticides to control pests and diseases, they often do not pay attention to the safe interval of drugs before the vegetables are put on the market, resulting in excessive pesticide residues on vegetables. In the face of one of the phenomena, vegetable farmers should improve the awareness of pesticide application and drug use at the same time, but also strengthen the daily vegetable market, supermarkets and other first-class pesticide residue control work of fruits, fruits and vegetables, so as to avoid the pesticide residues caused by repeated and large use of pesticides caused by the interval into the market, endangering food health and safety. Guanyu Instrument Pesticide Residue Detector can accurately and quickly detect the rapid detection of organophosphorus and carbamate pesticide residues in vegetables, fruits, grains, tea and soil.

It can be widely used in the detection of pesticide residues in fruits and vegetables in food safety testing and monitoring places such as vegetable testing centers at all levels, farmers' markets, supermarkets, environmental protection agencies, vegetable planting bases, restaurants, vehicles and laboratories.

Different varieties of pesticides have different residue times. The residual period of fungicides is generally 2-7 days, the residual period of fungicides is generally 2-7 days, and the residual period of acaricides is generally 7-14 days.

1.Germicide.

The residual period of 75% chlorothalonil wettable powder is 7 days; 77% can be killed wettable powder residue period of 3-5 days; 50% promethane wettable powder for 4-7 days; 70% methyl tobuzin wettable powder for 5-7 days; 50% Nongli Liquid WP for 4-5 days; The residual period of 58% manganese-zinc wettable powder is 2-3 days.

2.Insecticide.

The residual period of 10% cypermethrin EC is 2-5 days; The residual period of bromopermethrin is 2 days; The residual period of 5% anti-aphid wettable powder is 6 days; The residual period of emulsifiable concentrate of Aifu factory is 7 days; The residual period of Lesben EC is 7 days; The residual period of 20% emulsifiable concentrate is 3 days, etc.

Organochlorine pesticides have the longest residual period in soil, ranging from several years to 20 to 30 years. This is followed by homodiazepine benzene and phenoxyacetic acid herbicides, and the residue period is generally about a few months to one year.

Pesticide residue period, the time it takes for the amount of pesticides in the soil to be reduced by more than 75%. Due to the different chemical structures and properties of various pesticides, their residue periods in the soil are also different. When evaluating the residue period of pesticides, it should be measured from the aspects of preventing pollution and improving drug efficacy, and one of the two should not be neglected.

Note.

Some of the pesticides applied to crops are attached to crops, and some are scattered in the soil, atmosphere and water, and some of the pesticide residues in the environment will be absorbed by plants. Residual pesticides directly reach humans and animals through plant fruits, water, and the atmosphere, or are finally transmitted to humans and animals through the environment and food chain. Pesticide residue strippers can degrade pesticide residues on the surface of fruits and vegetables.

Pesticides have the longest residual period in the soil, ranging from several years to 20 to 30 years. In particular, organochlorine pesticides, followed by adiazine benzene and phenoxyacetic acid herbicides, generally have a residue period of several months to about one year.

Organophosphates and carbamates, as well as some fungicides, are generally only a few days or weeks old and rarely accumulate in the soil. The residual time of various pesticides in the soil is mainly determined by their physical and chemical properties, in addition to various factors such as soil texture, organic matter content, pH, moisture content, soil microbial community, tillage system and crop type.

Residual species. Some of the pesticides used can be biodegraded in a short period of time to become harmless, while organochlorine pesticides, including DDT, are difficult to degrade and are highly residual pesticides (see Organochlorine Pesticide Pollution).

According to the characteristics of residues, residual pesticides can be divided into three types: pesticides that are easy to remain in the plant body are called plant residual pesticides, such as Liuhe.

6. Endrin, etc.; Pesticides that are easy to remain in the soil are called soil residual pesticides, such as aldrin, dieldrin, etc.; Pesticides that are soluble in water and remain in water for a long time are called water residual pesticides, such as endrin. There are two forms of residual pesticides in plants, soils and waters: one is to maintain the original chemical structure; The other remains in the form of products of its chemical transformation or biodegradation.