Nitric acid 98% have? Commercially available concentrated nitric acid content of about 65%. Fuming nitric acid: colorless to yellowish or slightly brown clear liquid. Department of concentrated nitric acid containing dissolved nitrogen dioxide. 90% to 100% nitric acid. Emit nitrogen dioxide, nitrogen tetroxide of red and yellow smoke. Miscible with water. The relative density by increasing free nitrogen dioxide increases. Concentrated nitric acid containing nitrogen dioxide by 7.5 percent relative density (d204) of 1.526, containing nitrogen dioxide by 12.7% relative density (d204) 1.544. Strong oxidation and corrosion, do not come into contact with the oxide. Avoid contact with skin. (1) the product of about 10mg, a test tube, add water and sulfuric acid lml 2ml, nitric acid, mix, let cool dissolve slowly along the wall add ferrous sulfate test solution 3ml, make into two liquid layers, nitric manufacturer, then the interface was brown. (2) In the determination of the chromatogram records of the test solution peak retention time should be consistent with the reference solution peak retention time. (3) The product of the infrared light absorption spectrum with the control map (spectral set 473 Figure) consistent. [Check] nitrate to take this product 0.25g, add water, 5ml, shake for 5 minutes, filtered, and the filtrate added to a test tube 5ml sulfuric acid, mix and let cool slowly along the wall add ferrous sulfate test solution 5ml, so into two liquid layers, then the interface may not be immediately noticeable brown. Related substances to take this product, add the mobile phase ultrasound to dissolve and quantitative dilution made about containing lmg per lml solution as the test solution; another Precision Weigh 2 - isosorbide dinitrate standard, and isosorbide mononitrate ester reference standard, accurately weighed, nitric acid prices, plus mobile phase and quantitative dilution made about each lml each containing 0.5mg of the mixed solution, the precise amount of lml, set 100ml flask, then the precise addition of the test solution lml, with the mobile phase and dilute to the mark, shake, as the control solution. According to Gao performance liquid chromatography (Appendix V D) test. Octadecylsilane bonded silica as a filler; methanol - water (25: 75) as mobile phase; detection wavelength was 210nm. Take control solution 20μl, nitric acid droplets into the liquid chromatograph, adjust the sensitivity, the peak isosorbide mononitrate peak height of about 20% of full scale, 2-isosorbide dinitrate and isosorbide peak pear ester peak separation should be greater than 2.0. Nitric acid | potassium nitrate manufacturers | Zhengzhou Longda Chemical (certified merchants) are provided by Zhengzhou Longda Chemical Products Co., Ltd. Road Zhiyuan, temper forward. Zhengzhou Longda Chemical Products Co., Ltd. (www.longdahuagong.com/) aims to become and you win symbiosis, strategic partners to move forward, more determined to become the most influential of inorganic acid companies, and you leap together to success !