GB/T 5009.123-2003 Translated English of Chinese Standard. (GBT 5009.123-2003, GB/T5009.123-2003, GBT5009.123-2003): Determination of chromium in foods [Buy--download True-PDF in 3-second: https://play.google.com/books > Sign in > This BOOK > "3-dots" > Export > Save as "*.pdf"]https://www.chinesestandard.net, 27 feb 2015 - 9 pagine This Standard specifies the content of chromium in foods which is determined by graphite furnace atomic absorption spectrometry (GFAAS) and oscilloscope polarography method. This Standard is applicable to the determination of total chromium in all kinds of foods. Detection limit of this Standard: GFAAS is 0.2ng/mL; oscilloscope polarography method is 1ng/mL. |
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1.0mol/L nitrate 1.4135g of guaranteed 10mL volumetric flasks 25mL colorimetric tube 5.4mol/L sulfuric acid Add water ammonia-ammonium chloride buffer application solution arithmetic mean cathode chief drafting staffs China Medical University chloride buffer solution chromium in foods chromium in sample Chromium standard solution content of chromium Determination of chromium dilute to 100mL dissolve in water GB/T Graphite Furnace Atomic guaranteed reagent dichromate heat until hydrogen high temperature furnace High-pressure digestion tank hydrogen peroxide independent determined results Mash the edible mol/L a,a'-bipyridine solution mol/L sodium hydroxide mol/L sodium nitrite Oscillographic polarograph oscilloscope polarography method porcelain crucible pressure digestion tank proportion to content Respectively add responsible drafting organizations sample digestive liquid sample-ash soak for 1h staffs of method Standard curve standard series stock solution teflon inner-barrel test solution thymol blue indicator Tian Yongbi Unit is mL unit is ng/mL volume and mix volume of sample Wang Huaizhou water to dilute Wavelength West China Medical