HOME   Cart(0)   Quotation   About-Us Tax PDFs Standard-List Powered by Google www.ChineseStandard.net Database: 189760 (30 Nov 2024)

GB 31604.33-2016 English PDF

GB 31604.33-2016_English: PDF (GB31604.33-2016)
Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB 31604.33-2016English70 Add to Cart 0--9 seconds. Auto-delivery National Food Safety Standard -- Food Contact Materials and Articles -- Determination of Migration of Nickel Valid GB 31604.33-2016
Preview PDF: GB 31604.33-2016

BASIC DATA
Standard ID GB 31604.33-2016 (GB31604.33-2016)
Description (Translated English) National Food Safety Standard -- Food Contact Materials and Articles -- Determination of Migration of Nickel
Sector / Industry National Standard
Classification of Chinese Standard X09
Word Count Estimation 8,810
Date of Issue 2016-10-19
Date of Implementation 2017-04-19
Older Standard (superseded by this standard) SN/T 2829-2011 Partially; GB/T 5009.81-2003 Partially
Regulation (derived from) State Health and Family Planning Commission Notice No.1516 of 2016


GB 31604.33-2016 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National food safety standard - Food contact materials and products Determination of nickel migration ISSUED ON. OCTOBER 19, 2016 IMPLEMENTED ON. APRIL 19, 2017 Issued by. National Health and Family Planning Commission of the People’s Republic of China Table of Contents Foreword . 3 1 Scope .. 4 2 Principle . 4 3 Reagents and materials . 4 4 Instruments and equipment .. 6 5 Analysis procedure .. 6 6 Expression of analysis results .. 7 7 Precision . 7 8 Others . 7 9 Principle . 7 10 Reagents and materials . 8 11 Instruments and equipment .. 10 12 Analysis procedure . 10 13 Expression of analysis results . 11 14 Precision . 11 15 Others . 11 Annex A Reference temperature rise program of graphite furnace atomic absorption spectrometer . 12 Foreword This Standard replaces the determination method for nickel migration in GB/T 5009.81-2003 “Method for analysis of hygienic standard of stainless steel food containers and table wares” and SN/T 2829-2011 “Food contact materials for export - Metal materials - Determination of migrant heavy metals in food simulant - Inductively coupled plasma atomic emission spectrometric method”. Compared with the determination method for nickel in GB/T 5009.81-2003, the main changes are as follows. - MODIFY the standard name TO “National food safety standard - Food contact materials and products - Determination of nickel migration”; - ADD Inductively coupled plasma mass spectrometry and inductively coupled plasma atomic emission spectrometry. National food safety standard - Food contact materials and products Determination of nickel migration 1 Scope This Standard specifies the graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma atomic emission spectrometry and spectrophotometric method using dimethylglyoxime for the determination of nickel migration in food contact materials and products after being soaked in food simulants. This Standard applies to the determination of nickel migration in food contact materials and products. Method I -- Graphite furnace atomic absorption spectrometry 2 Principle Use food simulants to soak parts of food contact materials and products that are expected to come in contact with foods. The soaking solution is atomized in a graphite furnace. The absorbance measured at 232.0 nm is proportional to the nickel content within a certain concentration range, which is compared with the standard series to quantify. 3 Reagents and materials Unless otherwise stated, the reagents used in this method are all guarantee reagents, and the water is grade-2 water specified in GB/T 6682. 3.1 Reagents 3.1.1 Nitric acid (HNO3). 3.1.2 Ammonium dihydrogen phosphate (NH4H2PO4). 3.1.3 Reagents for preparing food simulants. According to specifications of GB 31604.1. 4 Instruments and equipment NOTE. All glassware must be soaked in nitric acid solution (1 + 5) overnight and rinsed with water for later use. 4.1 Atomic absorption spectrometer. equipped with graphite furnace atomizer, nickel hollow cathode lamp. 4.2 Analytical balance. with a division of 0.1 mg. 5 Analysis procedure 5.1 Pretreatment of samples According to the expected use and the use conditions of the sample to be tested, carry out the migration test in accordance with the migration test methods and test conditions specified in GB 5009.156 and GB 31604.1. After the soaking solution is thoroughly mixed, take part of the soaking solution for analysis. If the soaking solution is neutral or alkaline, add an appropriate amount of nitric acid so that the concentration of nitric acid in the test solution is about 5 % (volume fraction). At the same time carry out the sample blank test. 5.2 Determination 5.2.1 Instrument test conditions Instrument reference conditions are shown in Table A.1. 5.2.2 Plotting of standard curves PIPETTE 10 μL of nickel standard solution and 5 μL of ammonium dihydrogen phosphate solution (20 g/L) (the optimal injection volume may be determined in accordance with the instrument used) in the order of concentration from low to high, INJECT them into the graphite furnace at the same time. After atomization, MEASURE the absorbance value. Take the concentrations of the standard series as the abscissa and take the corresponding absorbance values as the ordinate to plot the standard curve. 5.2.3 Determination of samples Under the same test conditions as those for the determination of standard solution, PIPETTE 10 μL of sample solution and 5 μL of ammonium dihydrogen phosphate solution (20 g/L) (the optimal injection volume may be determined in accordance with the instrument used), INJECT them into the graphite furnace at the same time. After atomization, MEASURE the absorbance value. ammonia to decolorize, then reacts with basic dimethylglyoxime to form red complexes, which are compared with the standard series to quantify. 10 Reagents and materials Unless otherwise stated, the reagents used in this method are all analytical reagents, the water is the grade-3 water specified in GB/T 6682. 10.1 Reagents 10.1.1 Diammonium hydrogen nitrite [(NH4)2HC6H5O7]. 10.1.2 Dimethylglyoxime [(CH3)2C2(NOH)2]. 10.1.3 Ethanol (C2H5OH). 10.1.4 Chloroform (CHCl3). 10.1.5 Bromine Water (Br2). 10.1.6 Sodium hydroxide (NaOH). 10.1.7 Hydrochloric acid (HCl). 10.1.8 Ammonia (NH3 · H2O). 10.1.9 Nitric acid (HNO3). excellent regent. 10.1.10 Reagents for preparing food simulants. according to the specifications of GB 31604.1. 10.2 Preparation of reagents 10.2.1 Diammonium hydrogen nitrite solution (100 g/L). WEIGH 10 g of diammonium hydrogen nitrite and DISSOLVE in water to 100 mL. 10.2.2 Ethanol solution (95 + 5). ADD 5 mL of water to 95 mL of ethanol, MIX well. 10.2.3 Dimethylglyoxime ethanol solution (10 g/L). DISSOLVE 1 g of dimethylglyoxime and DISSOLVE in 100 mL of ethanol solution (95 + 5), MIX well. If there is any insoluble material, filter and the filtrate is for later use. 10.2.4 Sodium hydroxide solution (0.2 mol/L). DISSOLVE 1.0 g of sodium hydroxide in 125 mL of water. 10.2.5 Basic dimethylglyoxime solution (10 g/L). WEIGH 1 g of 11 Instruments and equipment NOTE. All glassware must be soaked in nitric acid solution (1 + 5) overnight and rinsed with water for later use. 11.1 Spectrophotometer. with 1 cm cuvette. 11.2 Analytical balance. with a division of 0.1 mg. 12 Analysis procedure 12.1 Pretreatment of samples The same as subclause 5.1. 12.2 Determination 12.2.1 Plotting of standard curves Respectively PIPETTE 0 mL, 0.250 mL, 0.500 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, 5.00 mL of nickel standard use solution (10.0 mg/L) to 100-mL volumetric flasks, ADD food simulants to the mark, the corresponding concentration series are 0 μg/L, 25.0 μg/L, 50.0 μg/L, 100 μg/L, 200 μg/L, 300 μg/L, 400 μg/L and 500 μg/L. ADD sodium hydroxide solution (20 %) to adjust to neutral or weak alkaline, LET STAND for 2 h, FILTER, TRANSFER the filtrate into a 250-mL separatory funnel, ADD 2 mL of diammonium hydrogen nitrite solution (100 g/L), ADD a few drops of ammonia solution (2 mol/L) to adjust the solution pH to 8 ~ 9. ADD 2 mL of dimethylglyoxime ethanol solution (10 g/L), ADD 10 mL of chloroform, vigorously SHAKE for 1 min, LET STAND, SEPARATE chloroform into a 60-mL separatory funnel. ADD 5 mL of chloroform to the aqueous layer and REPEAT the above operations twice, COMBINE chloroform solution, DISCARD the aqueous layer. USE 10 mL of ammonia solution (0.3 mol/L) to wash the chloroform layer, vigorously SHAKE for 30 s, LET STAND, SEPARATE the chloroform layer into another 60-mL separatory funnel; ADD 10 mL of hydrochloric acid solution (0.5 mol/L) to the funnel, vigorously SHAKE for 1 min, LET STAND, SEPARATE the chloroform layer into another separatory funnel. ADD 5 mL of hydrochloric acid solution (0.5 mol/L) and operate as above, COMBINE the hydrochloric acid solution, TRANSFER to a 25-mL colorimetric tube with stopper, ADD 2 mL of bromine water, SHAKE. LET STAND for 1 min, ADD ammonia solution (5 mol/L) until colorless, ADD 2 mL of ammonia solution (5 mol/L), COOL to room temperature in running water. ADD 2 mL of basic dimethylglyoxime solution (10 g/L), ADD water to 25 mL and MIX thoroughly, LET STAND for 20 min. DETERMINE the absorbance at 540 nm. TAKE the absorbance as the ordinate and the standard concentration as ......