1. What is pesticide residue?
Pesticide residues are a general term for trace amounts of pesticides, toxic metabolites, degradants and impurities that remain in organisms, harvests, soils, water, and the atmosphere without decomposition during the period after use.
Residual pesticides are directly passed to the human or animal body through plant fruits or water, the atmosphere, or passed to people and animals through the environment and food chain.
2. What are the hazards of pesticide residues on the human body?
Eating foods containing a large amount of highly toxic and highly toxic pesticide residues can lead to acute poisoning accidents in humans and animals. Long-term consumption of agricultural and sideline products with excessive pesticide residues, although it will not cause acute poisoning, may cause chronic poisoning, leading to disease and even affect the next generation. The specific performance is as follows:
1. Hazards to adults:
1 causes the body's immunity to decline. Such as frequent colds, dizziness, palpitations, night sweats, insomnia, forgetfulness and so on.
2 may cause cancer. Chemicals often found in residual pesticides can cause cancer in cells in tissues.
3 increase the burden on the liver. Residual pesticides enter the body, relying mainly on the liver to produce enzymes to absorb these toxins for oxidative decomposition. If you eat fruits and vegetables with pesticide residues for a long time, the liver will work constantly to break down these toxins. Long-term work will cause liver damage such as cirrhosis and hydronephrosis.
4 causes gastrointestinal diseases. Because the stomach wall of the digestive system of the gastrointestinal tract is more wrinkled, it is easy to contain poison. Such residual pesticides tend to accumulate therein, causing symptoms such as chronic diarrhea, nausea, and enteritis.
2. Hazards to children:
1 has a serious impact on brain development and IQ development in newborns and young children. As long as three-millionths of residual pesticides cause brain developmental disorders in children before the age of seven. Because children are in the growth stage, cells that grow rapidly are more susceptible to carcinogenic pesticides than cells that are more static than adults. According to relevant data surveys, among 40% to 50% of children with leukemia in rural areas of China, the cause or direct cause of the disease is chemical pesticides.
2 cause sexual precocity. Residual pesticides can harm the growth and development of environmental hormones in children before the age of 16 and are recognized as the main cause of abnormal growth and development in the world. The 4-year-old girl’s breasts are almost completely mature, and the 5-year-old child has menstruation. This phenomenon will be seen in various children’s hospitals across the country. These are closely related to the long-term use of fruits and vegetables with high pesticide residues.
3 caused serious illness. Scientists have shown that preschool children may become carcinogenic when exposed to more than eight pesticides. Long-term exposure to organophosphorus pesticides can impair the child's visual function and manifest symptoms of myopia and edema. Medical research has confirmed that almost all pesticides can cause damage to the child's immune system and reduce the resistance to disease.
3. Pregnant women:
1 to reduce the conception rate. According to statistics, there are currently one pair of infertility in every couple in China, and pesticide residues are one of the main reasons for such high infertility. The famous scientist Zhong Nanshan shouted loudly: pesticide residues are not controlled, and people will not be born in 50 years!
2 Abortion of a pregnant mother, stillbirth or birth of a deformed child. Abortion, stillbirth and fetal malformation caused by agricultural disabilities have been recognized worldwide. The period when the pesticide is harmful to the fetus is the early stage of pregnancy and the period of occurrence of the fetal organ.
How many steps does the pesticide residue detection procedure take?
1 Sample collection: sampling, sample transport and storage;
2 Sample pretreatment: shrinking, rejecting or pulverizing the sample to become a test sample;
3 sample preparation: extraction: the process of separating residual pesticides from the sample;
Purification: the process of separating pesticides from interfering substances in extracts;
4 Analytical determination
Among them, the pretreatment workload of the sample is large, and the fineness of the processed sample will directly affect the detection of the subsequent sample to a large extent, so an excellent performance instrument is needed to assist the staff to complete the cumbersome work. Of course, the staff also hopes that this pretreatment will be less time and easy to clean to improve work efficiency.
In the process of homogenization of pesticide residue detection samples, it is necessary to use a dispersing machine for homogenization. <br> It is especially important to choose a reliable and suitable homogenizer. Then the US DISRAD disperser came in handy. The US DISRAD disperser is extremely cost-effective and is the first choice for most pre-treatment of food pesticide residues.
The homogenizer treatment sample is very fine, and the effect of the sample treatment can be about ten micrometers or finer in a few seconds or ten seconds.
Handheld DR130 Smart processing capacity 0.3-500ml
The cutter head diameter is four (φ5mm, φ7mm, φ10mm, φ14mm), which can meet the processing capacity of different samples.
Desktop Disperser DR500 Std Handling 0.5ml-40L
It is an economical, cost-effective classic desktop disperser with superior performance and a wide range of applications to meet the needs of most laboratory processing samples.
Application areas:
Food industry: homogenization and emulsification of products to improve product stability;
Bioengineering: cell disruption, slurrying, extraction and homogenization of intracellular and extracellular substances;
Pharmaceutical industry: preparation of fat granules, microemulsions, liposomes, suspensions and microcapsules;
Fine chemicals, daily chemicals: homogeneous dispersion, emulsification;
Other applications: petrochemicals, pesticides, fertilizers, paper, etc.
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