The Environmental Protection Agency, EPA, and Occupational Safety and Health Administration, OSHA, however, have established that nickel metal and water-soluble nickel compounds are toxic above 0.001 milligrams per liter of drinking water. Heavy metal poisoning can cause many different conditions such as cancer, hormonal imbalances, neurological disturbances, depression, food allergies and much more. Nickel is a common metal that can cause many of these problems. About 10% of women and 2% of men are highly sensitive to nickel. According to the Agency of Toxic Substances and Disease Registry, dark chocolate contains a concentration of 2.6 µg/g of nickel, while milk chocolate has 1.2 µg/g. General Nickel Toxicity Information Nickel is a silver-white metal found in the earth’s crust that is used to produce steel, nickel-cadmium batteries, heating fuel, nickel plating and ceramics. Nickel chloride is used in electroplating, in nickel catalysts and to absorb ammonia in industrial gas masks. Nickel is a silver-colored metal found naturally in the environment. ysmina January 15, 2013 . I thought that nickel poisoning and nickel allergy is the same but apparently it's not. Compared to chromium, nickel leaching is a much more serious issue since it’s right up there in the Substance Priority List (SPL) of the Agency for Toxic Substances and Disease Registry (ATSDR). And, according to a study in 2013, stainless steel cookware does leach chromium and nickel during the cooking process. For all three compounds, the threshold for lung effects decreased as the duration of exposure increased. It is one of only four elements that are magnetic at or near room temperature, the others being iron, cobalt and gadolinium.Its Curie temperature is 355 °C (671 °F), meaning that bulk nickel is non-magnetic above this temperature. Animal studies suggest that nickel may play a role in the body’s use of folic acid and vitamin B12, which are both necessary to help maintain desirable levels of homocysteine, a toxic amino acid that is associated with an increased risk of heart disease and stroke. The level usually found in soil samples is 15 ppm; at 40 ppm, the nickel concentration is considered toxic. Dietary standards for trace nickel in human consumption are not established. Exposure to Nickel Exposure to nickel sulfate or nickel subsulfide also produced damage to the nasal olfactory epithelium. Exposure to these fumes should be regulated, and anybody in that Environment is strongly advised to wear a facemask to limit exposure. Certain amounts of nickel are useful to the human body, but too much nickel can be toxic. However, there’s sad news for people allergic to nickel – chocolate is full of it. Exposure to this substance can cause severe dermatitis, skin and asthma-like allergies and affects the lungs, kidneys, gastrointestinal tract and neurological system. The meteorite in question has been estimated to be approximately 10 km in diameter, and the nickel fallout would have been somewhere between 130 and 1300 ppm (parts per million). Nickel Leaching. It’s often mixed with other metals and used to make various everyday items. Toxicity. Exposure to nickel can be found where metal compounds and alloys are welded, cut, and plated, causing the air to become extremely hot, and setting-off metal carcinogenic fumes, such as nickel. @ankara-- It's not that difficult to know because these symptoms will be triggered by nickel exposure. 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