Hazards Of Heavy Metal Nickel
The chemical properties of nickel is similar to iron and cobalt
, can not react with water and air at room temperature, can resistant to alkaline corrosion; nickel can slowly dissolved in diluted hydrochloric acid, sulfuric acid and nitric acid, release hydrogen; nickel powder can absorb a considerable amount of hydrogen gas when heated; while heating can react violently with oxygen, sulfur, chlorine, bromine, etc.. Most industrial nickel for stainless steel and other corrosion-resistant alloys; Nickel also used in nickel plating, ceramics, batteries, polypropylene coloring; mainly for a hydrogenation catalyst in chemistry.
Nickel is a silver-white metal; melting point is1455 C, the boiling point is 2730 C, the density is 8.9 g / cm 3. Nickel is harder and tougher than iron, with ferromagnetic and ductility, can conduct electricity and heat. The common industrial nickel compounds have nickel oxide, nickel trioxide, nickel hydroxide, nickel sulfate, nickel chloride and nickel nitrate. Can cause acute poisoning except the most toxic nickel carbonyl, nickel, and a water-soluble compound having the sensitization, certain nickel compound has a potential carcinogenicity. The major nickel poisoning is inhaled nickel and its salts dust caused clinical manifestations of respiratory irritation and skin damage. According to metal powder supplier, nickel is used in the industrial production of various nickel alloys, utensils and materials. The workers long-term exposure to nickel not only have the poisoning opportunities, but also increased cancer risk.
Patients with cough, expectoration, chest tightness, chest pain, asthma. Chest X-ray showed increased lung markings, the patchy shadows, hilar widened. Engaged in nickel electrolysis and electroplating workers may cause rhinitis, anosmia and nasal septum perforation. Skin lesions are more common in exposed parts. Lesions nature is erythema, papules, constant itching, so called nickel scrapie. Chronic skin lesions showed lichenification or pigmentation. The skin lesions self-healing after several weeks or months. Other long-term exposure to nickel workers will increase the risk of nasal cancer and lung cancer.
Stainless steel cutlery is generally containing chromium and nickel, chromium is the material make the product does not rust, and nickel is corrosion resistant material. If use low-quality stainless steel cutlery or use stainless steel cutlery in improper methods, it may cause heavy metals on human health hazards.
Recently, scientists have discovered that a nominal value of 1 euro and 2-euro coins will release the ultra-high amount of nickel, causing skin allergies. One of the reasons is not simply a high nickel content, but that the two coins unique design - double alloy. 1,2 Euro coin containing nickel, and their outer edge trimmed with a circle with the inner core component of the alloy, thereby increasing the difficulty of forgery. In which the outer ring of the euro coins as copper, zinc, nickel alloy, the inner core of copper-nickel alloy; 2 euro coins contrary, the outer ring is a copper-nickel alloy inner core of copper and zinc-nickel alloy. The nominal value of less than 1 euro coins are no containing nickel.
Scientists put coin in a simulated human sweat or a saturated salt solution, find that it can cause 30-40 millivolt voltage between the two alloys. The simulated sweat release of nickel ions in quantities of 1,2 Euro coins is considerably higher than the pure nickel, while a coin rapid corrosion. They put the coins with a transparent adhesive in the skin of seven patients with nickel allergy, after 48-72 hours, all patients had skin redness from the blisters allergic reactions.
Magnetic nickel is widely used in the manufacture of jewelry, coins, metal buttons. Due to a lot of ordinary people allergic to nickel, the European Union limit the nickel release in the "long-term contact with the skin objects such as earrings and watches, but the coin is not in the restricted. The scientists said that the number of 1 and 2 euro coins release of nickel is 240 to 320 times higher than the EU above the standard limit value. This may cause skin allergies in workers who contact with the coin regularly.
Source:http://www.mhcmp.com
by: anelwew
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