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Plastic packaging contains carcinogens 9 major brands of food packaging

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 Plastic packaging contains carcinogens 9 major brands of food packaging
 Plastics are ubiquitous in our lives, and rumors about plastics harmful to the body have never been interrupted. Sohu Health tested the plastic bottles of the common 12 brands of drinks and condiments, and found that the bottles made of PET materials contain carcinogens - heavy metal , which is notorious Brand products, such as Coca-Cola, Kangshifu mineral water, Niulanshan Erguotou, Fulinmen blending oil, etc., the highest residue is the wide-brand gantry rice vinegar bottle material. The bottles made of HDPE and PP materials were not detected.
 PET bottles are all residual Wide brand gantry rice vinegar bottle material residue
 PET is currently the most used packaging material for beverages. However, in this test, nine plastic bottles of PET material were found to have defects. Among the bottles of the wide-brand gantry rice vinegar, the residue of cockroaches is the highest (see Table 1). In the case of bottles made of HDPE and PP, no defects were detected.
 Why is it in PET materials?
 He Mengchang, a professor at the Environmental College of Beijing Normal University, said in an interview with Sohu Health that it is often used as a catalyst in the production of PET to promote the polycondensation reaction, so it may remain in the bottle made of PET. Gong Hao, member of the Environmental Protection Standards Research Committee of the China Environmental Protection Association and associate professor of the School of Materials, Beijing Institute of Clothing Technology, believes that PET has the most residues in various plastic materials, and is mainly used for catalytic synthesis. The high content indicates that the process is not Well, there is no process to get rid of cockroaches; and it is called for businesses to actively reduce the use of cerium oxide as a catalyst, and to use titanium catalysts to synthesize PET.
 According to reports in the literature [1-2], polyester polymerization catalysts include sulfhydryl, sulfhydryl and titanium-based catalysts, and currently 90% use ruthenium-based catalysts such as ruthenium acetate and antimony trioxide. The ruthenium-based catalyst has good effect and low price, but has heavy metal deposition, and the color of the resin is easy to be dark. Resins made from ruthenium-based catalysts are highly transparent but expensive. Titanium-based catalysts have high catalytic activity and are environmentally friendly, and it has become a general trend to replace ruthenium-based catalysts. In recent years, PET non-ruthenium catalyst research has been very active. DuPont, Toyobo, Teijin, Gima, Acordis, Synetix and other companies have launched environmentally friendly catalysts for no-metals and heavy metals. However, titanium-based catalysts also have corresponding disadvantages. Further research is needed on how to control their activity by modification and improve the yellowing and easy thermal degradation of products.
 According to the results of Sohu Health's evaluation, the safety factor of HDPE and PP is higher. At the bottom of the plastic bottle, there are triangular signs, the numbers of which represent the type of plastic. The number 1 represents PET, the number 2 represents HDPE, and the number 5 represents PP.
Trivalent cesium can cause cancer safety risk in beverages
 It is listed as a priority pollutant by the US Environmental Protection Agency and the European Union, and it is also a pollutant closely watched by the Japanese Environment Agency. It is listed as a hazardous waste in the Basel Convention on the regulation of transboundary movement of hazardous waste. China's "surface water environmental quality standards" (GB 3838-2002) and "Sanitary Standards for Drinking Water" (GB 5749-2006) have a limit of 5 μg / L [3].
 The toxicity of hydrazine and its compounds depends mainly on the oxidation state and combination of hydrazine. Trivalent europium has high affinity with red blood cells, and its toxicity is about 10 times that of pentavalent anthraquinone. Trivalent cesium compounds not only have carcinogenic effects, but also affect the effects of certain enzymes and organs in the human body. The toxicity of inorganic hydrazine is stronger than that of organic hydrazine [4].
 Under the influence of temperature and beverage properties, it will slowly transfer to the beverages contained in the bottle.
 According to a report in the British "Daily Mail" in April 2006, Dr. Stoke of the University of Heidelberg conducted chemical tests on groundwater and 15 kinds of bottled mineral water in Canada and found that the content of strontium in bottled mineral water exceeded the standard. .
 British chemical researcher William Shadick conducted a chemical test on 15 hot-selling bottled waters and found that the amount of barium in natural groundwater is one-hundredth of a billion, while the amount of barium in freshly bottled water is on average. One hundred sixty. After three months from the factory, the content of antimony in bottled water has doubled.
 In 2007, the internationally renowned Environmental Science and Technology (ES&T) publication reported that sputum contamination was detected in mineral water and beverages contained in PET containers [5].
 In 2008, Jiang Qi et al. [1] tested the strontium content of eight kinds of PET-packed beverages (including carbonated beverages, alkaline beverages, mineral water and purified water beverages) commonly found in the market, and 锑 in four carbonated beverages. The content is 10-70μg/L; the content of strontium in the two alkaline beverages is 14-34μg/L; the content of strontium in one mineral water and one pure water is ≤1μg/L. The results show that the acidity and alkalinity of the beverage promotes the precipitation of hydrazine.
 How much does it take to get into the human body through beverages, water, condiments, etc.? Zhou Xiaodong, a professor at East China University of Science and Technology, once said to the media that high temperature does cause more substances such as cockroaches to be released, and the longer the storage time, the more substances will be released. "But how much of these substances will cause harm to the human body. That, it depends on the accurate analysis results of the quality inspection departments." Hao Fengtong, chief physician of the Department of Occupational Diseases and Poisoning Medicine, Beijing Chaoyang Hospital, Capital Medical University, said: "The existing research focuses on the human hazards caused by inhalation of the respiratory tract. It is still unclear how much the digestive tract absorbs to reach the hazard. In 2002, WHO recommended that the strontium content in drinking water should not exceed 0.86 μg/kg water/day."
 High temperature, acidic (alkaline) beverages, long-term storage, these are all favorable factors that promote the transfer of cockroaches from packaging to beverages. If it is contained in an acidic substance, it is easier to accelerate the precipitation. To stay away from the cockroaches, drink as little as possible of the acidic (alkaline) beverages in PET packaging, and at the same time choose products that are close to the date of manufacture and have good storage conditions. Associate Professor Gong Wei reminded consumers not to use PET bottles repeatedly. It is best not to install hot water. Do not store them after long-term storage of PET-packed drinks. Drink them as soon as possible.
 Attachment: The testing process in the evaluation of this issue (Gong Yu, Associate Professor, School of Materials, Beijing Institute of Clothing Technology, provides testing)
 1. Wash and dry the bottle;
 2. Cut the bottle into square pieces of about 0.5*0.5 cm and take 0.5g for testing;
 3. The X-ray fluorescence spectrometer is used to detect the square of the bottle;
4. Determine the relative value of the strontium content based on the peak height.

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