GB 5009.90-2016 PDF EnglishUS$70.00 · In stock · Download in 9 seconds
GB 5009.90-2016: National food safety standard - Determination of iron in foods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 5009.90: Historical versions
Similar standardsGB 5009.90-2016: National food safety standard - Determination of iron in foods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB5009.90-2016GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National food safety standard - Determination of iron in foods Issued on. DECEMBER 23, 2016 Implemented on. JUNE 23, 2017 Issued by. National Health and Family Planning Commission of the PRC; State Food and Drug Administration. Table of ContentsForeword... 3 1 Scope... 4 2 Principles... 4 3 Reagents and materials... 4 4 Instrument and equipment... 5 5 Analytical procedures... 6 6 Analysis results expression... 8 7 Precision... 9 8 Others... 9 Appendix A Microwave digestion temperature-rise program... 10 Appendix B Reference conditions of flame atomic absorption spectrometry. 11ForewordThis standard replaces methods for the determination of iron content in GB 5413.21-2010 "National food safety standard - Determination of calcium, iron, zinc, sodium, potassium, magnesium, copper and manganese in foods for infants and young child"; GB/T 23375-2009 “Determination of copper, iron, zinc, calcium, magnesium and phosphorus content in vegetables and derived products”; GB/T 5009.90-2003 “Determination of iron, magnesium and manganese in foods”; GB/T 14609-2008 “Inspection of grain and oils - Determination of copper, iron, manganese, zinc, calcium, magnesium in cereals and derived products by atomic absorption and flame spectrophotometry”; GB/T 18932.12-2002 “Method for the determination of potassium, sodium, calcium, magnesium, zinc, iron, copper, manganese, chromium, lead, cadmium contents in honey - Atomic absorption spectrometry”; GB/T 9695.3-2009 “Meat and meat products - Determination of iron content”; NY/T 1201-2006 “Determination of copper, iron and zinc content in vegetables and derived products”. As compared with GB/T 5009.90-2003, the main changes of this standard are as follows. --- Standard name is changed to "National food safety standard - Determination of iron in foods"; --- Add microwave digestion, pressure tank digestion and dry digestion; --- Add the inductively coupled plasma emission spectrometry; --- Add the inductively coupled plasma mass spectrometry; --- Delete spectrophotometry. National Food Safety Standard - Determination of iron in foods1 ScopeThis standard specifies the determination of iron content in foods by flame atomic absorption spectrometry, inductively coupled plasma emission spectrometry and inductively coupled plasma mass spectrometry. This standard applies to the determination of iron content in foods. Method I. Flame atomic absorption spectrometry2 PrinciplesAfter digestion, the sample is atomized by atomic absorption and the absorbance value is measured at 248.3 nm. Within a certain concentration range, iron absorbance value is directly proportional to iron content; compares with the standard series for quantitation.3 Reagents and materialsUnless otherwise indicated, the reagents used in this method are guaranteed reagent, the water is the grade-2 water specified in GB/T 6682. 3.1 Reagents 3.1.1 Nitric acid (HNO3). 3.2 Reagent preparation 3.2.1 Nitric acid solution (5+95). MEASURE 50 mL of nitric acid; POUR into 950mL of water; MIX it uniformly. 3.3 Standards Ferric ammonium sulfate [NH4Fe(SO4)2•12H2O, CAS number 7783-83-7]. Purity > 99.99%. Or iron standard solution with a certain concentration which is identified by national authentication and awarded a reference material certificate. 3.4 Standard solution preparation 3.4.1 Iron standard stock solution (1000 mg/L). WEIGH accurately 0.8631 g (accurate to 0.0001 g) of ammonium ferric sulfate; ADD water to dissolve it; ADD 1.00 mL of sulfuric acid solution (1+3); 3.4.2 Iron standard intermediate solution (100 mg/L). PIPETTE accurately 10mL of iron standard stock solution (1000 mg/L) into a 100mL volumetric flask; ADD nitric acid solution (5+95) to the mark; MIX it uniformly. The mass concentration of the iron solution is 100 mg/L.4 Instrument and equipmentNote. All glassware and Teflon digestion inner-tank must be soaked in nitric acid solution (1+5) overnight, washed repeatedly with tap water, finally rinsed with water. 4.1 Atomic Absorption Spectrometer. equipped with flame atomizer, iron hollow cathode lamp. 4.5 Adjustable hot plate. 4.6 Pressure digestion tank. equipped with Teflon digestion inner-tank. 4.7 Constant temperature oven. 4.8 Muffle furnace.5 Analytical procedures5.1 Sample preparation Note. During sampling and preparation, AVOID sample contamination. 5.1.1 Samples of food and beans Remove debris of samples; crush; store it in plastic bottles. 5.2 Sample digestion 5.2.1 Wet digestion Accurately WEIGH 0.5 g ~ 3 g of solid sample (accurate to 0.001 g) or accurately MOVE 1.00 mL ~ 5.00 mL of liquid sample into graduated digestive tube; ADD 10 mL of nitric acid and 0.5 mL of perchloric acid; 5.2.2 Microwave digestion Accurately WEIGH 0.2 g ~ 0.8 g of solid sample (accurate to 0.001 g) or accurately MOVE 1.00 mL ~ 3.00 mL of liquid sample into microwave digestion tank; ADD 5mL of nitric acid; 5.2.4 Dry digestion Accurately WEIGH 0.5 g ~ 3 g of solid sample (accurate to 0.001 g) or accurately MOVE 2.00 mL ~ 5.00 mL of liquid sample into a crucible; HEAT it in soft fire; CARBONIZE to smokeless; TRANSFER it into a muffle furnace; ASH at 550°C for 3h ~ 4h. Take out after cooling; for sample that is not completely ashed, ADD a few drops of nitric acid; HEAT in soft fire; EVAPORATE carefully; TRANSFER it into a muffle furnace at 550°C; CONTINUE ashing for 1h ~ 2h until the sample is in white-gray; TAKE out after cooling; DISSOLVE it with appropriate amount of nitric acid solution (1+1); TRANSFER it into a 25 mL volumetric flask. USE a small amount of water to wash the inner tank and the inner caps for 2~3 times; COMBINE washing liquid in the volumetric flask; Use water to dilute it to the mark. Meanwhile. DO a sample blank test. 5.3 Determination 5.3.1 Instrument’s test conditions Reference conditions are shown in Table B.1.6 Analysis results expressionThe iron content in the sample is calculated in accordance with the equation (1).7 PrecisionThe absolute difference between the two independent determinations obtained under repeatability conditions shall not exceed 10% of the arithmetic mean.8 OthersWhen the sampling weight is 0.5 g (or 0.5 mL) and the constant-volume is 25 mL, the method detection limit is 0.75 mg/kg (or 0.75 mg/L) and the quantitative limit is 2.5 mg/kg (or 2.5 mg/L).Appendix AMicrowave digestion temperature-rise program Microwave digestion temperature-rise program is as shown in Table A.1.Appendix BReference conditions of flame atomic absorption spectrometry Reference conditions of flame atomic absorption spectrometry are as shown in Table B.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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