Zinc nitrate can strongly to corrode metal, glass and silicon-containing objects, such as inhalation of vapors or contact with the skin can form ulcers difficult to heal, it is difficult to cure. Fluorine is the most active non-metallic, strong oxidizing power, the content of zinc nitrate, zinc nitrate and the radius of the fluoride ion is very small, even less than oxygen ions, zinc nitrate wholesale, which causes it to have a strong permeability, dense oxide It was also not prevent penetration. Zinc nitrate standard solution and the concentration of the calibration main sources of uncertainty in the quality of aluminum scrap, aluminum scrap mass fraction, the molar mass of aluminum and aluminum standard solution volume, etc. configuration. Uncertainty aluminum molar mass is based on the relative molecular mass of information IUPAC (International Union of Pure and Applied Chemistry (IUPAC)) of the periodic table published in previous years given to the assessment. Would 450ml water and 320ml chemically pure nitric acid (relative density 1.40) was heated to 50 ℃, a little added 125g granulated zinc (or 160g pure zinc oxide), Shandong zinc nitrate, the reaction: After the reaction, the solution was allowed to stand for clarification, filtered and concentrated to a density of 1.61 is heated, stirring constantly cooled to 5 ~ 10 ℃, zinc nitrate, crystal drying, sealed. To obtain excellent pure product, still using the above method, granular zinc to chemically pure, analytical grade nitric acid to be used. After completion of the reaction, to heat about 3h, so Fe3 + ions completely precipitated, even zinc oxide in addition to Fe3 + ions, acidified with nitric acid, and test the solution Fe3 + ions is checked, and then recrystallized. Recrystallization process to use a small amount of distilled water. Zinc nitrate level chemical nature _ three quality assurance (Advisory) _ zinc nitrate provided by the Jinan Chemical Co., Ltd. three levels. Jinan three ping Chemical Co., Ltd. (www.sanpinghuagong.com) Shandong Jinan, chemical products leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Three-ping Chemical leadership with the staff warmly welcome all inquiries negotiations to create three levels of chemical better future.