"The piglet is on the body and the applause is given to the people." This year, a pink pig that has crossed the ocean to China, because of this sentence and a series of expressions, the time has passed all over the country. Many people are proud of having the status of "social people" and have printed tattoos of Pig Peggy on their bodies. Of course, most of them use tattoo stickers instead of actually going to the tattoo shop. However, it is this inconspicuous tattoo sticker that caused a British girl to have severe skin allergies and had to go to the hospital.
So, can you buy ten or even dozens of small pigs' tattoo stickers on the market for a few dollars? Can it also cause skin allergies or other symptoms? The two reporters conducted a personal test on this, and the results showed that one of the female reporters had an itchy redness after applying a tattoo and showed obvious allergic symptoms. After a professional test instrument, these tattoo stickers actually detected mercury substances.
As we all know, mercury is the only liquid metal substance at normal temperature, and it is widely used in people's production and life. However, as a heavy metal, its highly toxic nature can cause considerable damage to the nerves, digestion and immune system of the human body, which is frightening. The water plague that erupted in Japan in the 1950s was caused by mercury pollution. The Minamata Convention on mercury took effect on August 16 last year, aiming to control and reduce mercury emissions globally and reduce its environmental and Damage caused by human health. Although many countries, including China, are gradually reducing or even prohibiting the production of mercury-containing products, the “invisible killer†like tattoo stickers in daily life is still threatening people's health.
So, which technical methods and equipment can detect mercury? It depends on which type of substance. In fact, toxic mercury will not only “hidden†among the items used, but also float in the atmosphere and even into water bodies and foods, causing harm to the ecological environment and human health. Therefore, the detection of mercury substances also requires different technical methods and equipment for the atmosphere, water quality, food and other supplies.
"Invisible Killer" - Gaseous Mercury
Mercury is rarely distributed in nature. It is generally present in liquid state at normal temperature and normal pressure, and can also be vaporized into gaseous mercury, causing pollution to the atmospheric environment. In industrial production related to mercury, producers must wear protective measures to avoid inhalation of gaseous mercury, resulting in chronic or acute poisoning. In the family, it is also necessary to avoid the mercury-containing substances such as mercury thermometers from breaking, and the liquid mercury volatilizes into the air and causes harm to the human body.
For the content of gaseous mercury in the atmosphere, China's "Integrated Emission Standard for Air Pollutants" stipulates that the maximum allowable emission concentration of mercury and its compounds is 0.015 mg per cubic meter. The specific detection method is that the gaseous mercury in the ambient air is collected by a gold film microparticle mercury enrichment tube, and then heated and analyzed, released into a mercury analyzer for re-enrichment and analysis, and the concentration is determined by cold atomic absorption spectrophotometry. The entire process requires the use of instruments such as enrichment tubes, gaseous mercury sampling systems, thermal analysis-cold atomic absorption mercury measurement systems, and mercury enrichment systems.
Cyclic enrichment - mercury in water
The source of mercury can be divided into natural and man-made, and the latter is released in a large amount, which is the main culprit of mercury pollution. At present, mercury pollution in water caused by human activities mainly comes from industrial wastewater. Mercury that is released into the atmosphere and soil will also return to the water body as the water circulates. In the end, these “hidden†mercury in the water will enter the body to enrich and damage life and health. Therefore, it is crucial to strengthen the detection of mercury in water bodies.
Whether it is inorganic mercury, organic mercury or total mercury, the determination of mercury in water can be done by cold atomic absorption method, inorganic mercury is determined in acidic medium, total mercury is determined in alkaline medium, and inorganic mercury can be subtracted from total mercury. Calculate the content of organic mercury. In addition, cold atomic fluorescence spectrometry, atomic fluorescence spectrometry, inductively coupled plasma dithizone spectrophotometry, flame atomic absorption spectrometry and graphite furnace atomic absorption spectrometry can also be used to determine the mercury content, and the methods have their own advantages and disadvantages. The first few methods can measure trace amounts of trace mercury in water with less interference factors and high sensitivity. Dithizone spectrophotometry is a general method for the determination of various metal ions. It can measure the high mercury concentration in water. Although the procedure is cumbersome, it can be applied to the determination of industrial mercury-containing wastewater with higher concentration.
Unavoidable - mercury around you
Mercury enriched in humans comes not only from water, but also from food and other contacts. Mercury-contaminated foods are mainly derived from agricultural products grown in soil contaminated by industrial wastewater, and fish and shellfish in water. In addition, contact materials such as tattoo stickers may also contain certain mercury substances, causing other discomfort to the human body (such as skin irritation).
The determination of total mercury and organic mercury in food can mainly be carried out by atomic fluorescence spectrometry. The required instruments are liquid chromatography, on-line UV digestion system, atomic fluorescence spectrometer, and high-speed pulverizer and freeze dryer for treatment. Centrifuges, ultrasonic cleaners, etc. The mercury content of human contact materials can be measured by atomic absorption, atomic fluorescence, inductively coupled plasma emission spectrometry, inductively coupled plasma mass spectrometry, etc. according to specific national standards. It is worth mentioning that these methods can also be applied to the detection of other heavy metals.
Although trace amounts of mercury can be excreted in the human body through urine, stool and sweat, it will not cause harm, but once it is excessive, it will seriously damage human health. From the ancient Chinese ancestors who died of mercury-containing medicinal herbs, to the warlocks who died in Europe after the alchemy, and to the innocent people who died in the industrial development process because of mercury pollution, the mercury pollution incidents were shocking. It is expected that the implementation of the Minamata Convention will bring a pure and safe world to humanity and bid farewell to the poisoning of mercury pollution.
Inferior tattoo stickers on the market (sold) may contain formaldehyde and heavy metals, which can be irritating to the skin. The red color in the tattoo sticker is mainly composed of cinnabar, that is, mercury. The black color in the pattern is generally composed of titanium oxide or carbon, and the yellow color is generally composed of chromium. These skins are also prone to skin allergic reactions after contact with the skin. Children and skin sensitive adults should never put a tattoo sticker.
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