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GB 31604.25-2016

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GB 31604.25-2016 英文版 250 购买 现货,9秒内自动发货PDF,有增值税发票。 食品安全国家标准 食品接触材料及制品 铬迁移量的测定 作废

   
标准详细信息 GB 31604.25-2016; GB31604.25-2016
中文名称: 食品安全国家标准 食品接触材料及制品 铬迁移量的测定
英文名称: Method for analysis of hygienic standard of polytetrafluorethylene coating for inner wall of food container
行业: 国家标准
中标分类: X09
字数估计: 8,847
发布日期: 2016-10-19
实施日期: 2017-04-19
旧标准 (被替代): SN/T 2829-2011部分; SN/T 2597-2010部分; GB/T 5009.81-2003部分; GB/T 5009.80-2003部分
标准依据: 国家卫生和计划生育委员会公告2016年第15号

GB 31604.25-2016
Method for analysis of hygienic standard of polytetrafluorethylene coating for inner wall of food container
中华人民共和国国家标准
食品安全国家标准
食品接触材料及制品 铬迁移量的测定
2016-10-19发布
2017-04-19实施
中 华 人 民 共 和 国
国家卫生和计划生育委员会 发 布
前言
本标准代替 GB/T 5009.80-2003《食品容器内壁聚四氟乙烯涂料卫生标准的分析方法》、
GB/T 5009.81-2003《不锈钢食具容器卫生标准的分析方法》、SN/T 2597-2010《食品接触材料 高
分子材料 铅、镉、铬、砷、锑、锗迁移量的测定 电感耦合等离子体原子发射光谱法》和SN/T 2829-
2011《出口食品接触材料 金属材料 食品模拟物中重金属含量的测定 电感耦合等离子体发射光谱
法》中铬迁移量的测定。
本标准与GB/T 5009.81-2003相比,主要变化如下:
---标准名称修改为“食品安全国家标准 食品接触材料及制品 铬迁移量的测定”;
---增加了电感耦合等离子体质谱法;
---增加了电感耦合等离子体发射光谱法。
食品安全国家标准
食品接触材料及制品 铬迁移量的测定
1 范围
本标准规定了食品接触材料及其制品在食品模拟物中浸泡后铬迁移量测定的石墨炉原子吸收光谱
法、电感耦合等离子体质谱法、电感耦合等离子体发射光谱法和二苯碳酰二肼比色法。
本标准适用于食品接触材料及其制品中铬迁移量的测定。
第一法 石墨炉原子吸收光谱法
2 原理
采用食品模拟物浸泡食品接触材料及制品中预期与食品接触的部分,浸泡液经石墨炉原子化,在
357.9nm处测定的吸收值在一定浓度范围内与铬含量成正比,与标准系列比较定量。
3 试剂和材料
除非另有说明,本方法所用试剂均为优级纯,水为GB/T 6682规定的二级水。
3.1 试剂
3.1.1 硝酸(HNO3)。
3.1.2 磷酸二氢铵(NH4H2PO4)。
3.1.3 配制食品模拟物所需试剂:依据GB 31604.1的规定。
3.2 试剂配制
3.2.1 食品模拟物:按照GB 5009.156的规定配制。
3.2.2 硝酸溶液(5+95):吸取5mL硝酸,加至950mL水,混匀。
3.2.3 磷酸二氢铵溶液(20g/L):称取2.0g磷酸二氢铵,用水溶解,定容至100mL。
3.3 标准品
重铬酸钾(K2Cr2O7,CAS号:7778-50-9):纯度>99.99%,或经国家认证并授予标准物质证书的一
定浓度的铬标准溶液。
3.4 标准溶液配制
3.4.1 铬标准储备液(1000mg/L):准确称取1.4315g(精确至0.0001g)重铬酸钾,溶于水中,移入
500mL容量瓶中,用硝酸溶液(5+95)稀释至刻度。混匀。
3.4.2 铬标准中间液(1.00mg/L):吸取铬标准储备液1.00mL于1000mL容量瓶中,加硝酸溶液

GB 31604.25-2016
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
National standard for food safety -
Determination of chromium migration quantity in
food contact materials and products
食品安全国家标准
食品接触材料及制品 铬迁移量的测定
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
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Table of Contents
Foreword ... 4 
1 Scope ... 5 
Method I Graphite furnace atomic absorption spectrometry ... 5 
2 Principle... 5 
3 Reagents and materials ... 5 
4 Instruments and equipment ... 7 
5 Analytical procedures ... 7 
6 Expression of analysis results ... 8 
7 Precision... 8 
8 Others ... 8 
Method II Inductively coupled plasma mass spectrometry ... 8 
Method III Inductively coupled plasma atomic emission spectrometry ... 8 
Method IV Diphenylcarbazide colorimetry ... 8 
9 Principle... 8 
10 Reagents and materials... 9 
11 Instruments and equipment ... 10 
12 Analytical procedures ... 11 
13 Expression of analysis results ... 12 
14 Precision ... 12 
15 Others ... 12 
Annex A ... 13 
Foreword
The determination of chromium migration quantity in GB/T 5009.80-2003
Method for analysis of hygienic standard of polytetrafluorethylene coating for
inner wall of food container, GB/T 5009.81-2003 Method for analysis of hygienic
standard of stainless steel food containers and table wares, SN/T 2597-2010
Determination of lead, cadmium, chromium, arsenic, antimony, germanium
migration quantity in polymer for food contact materials - Inductively coupled
plasma atomic emission spectrometry method 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 is substituted by this Standard.
Compared with GB/T 5009.81-2003, the major changes in this Standard are as
follows.
— MODIFY the standard name as “National standard for food safety -
Determination of chromium migration quantity in food contact materials
and products”;
— ADD the inductively coupled plasma mass spectrometry; and
— ADD the inductively coupled plasma atomic emission spectrometry.
National standard for food safety -
Determination of chromium migration quantity
in food contact materials and products
1 Scope
This Standard specifies the graphite furnace atomic absorption spectrometry,
inductively coupled plasma mass spectrometry, inductively coupled plasma
atomic emission spectrometry, and diphenylcarbazide colorimetry for the
determination of chromium migration quantity in food contact materials and their
products after immersed in food simulant.
This Standard is applicable to the determination of chromium migration quantity
in food contact materials and their products.
Method I Graphite furnace atomic absorption spectrometry
2 Principle
food in the food contact materials and products. The soaking solution is
atomized by a graphite furnace. The absorbance determined at 357.9nm is
proportional to the chromium content within a certain concentration range.
COMPARE with the standard series for quantitation.
3 Reagents and materials
Unless otherwise indicated, the reagents and water used in this method are
guaranteed reagents and Type II reagent grade water specified in GB/T 6682,
respectively.
3.1 Reagents
3.1.2 Ammonium dihydrogen phosphate (NH4H2PO4).
4 Instruments and equipment
Note. All glassware needs to be soaked in nitric acid solution (1 + 5) overnight. USE tap water to wash
repeatedly. RINSE with water eventually.
4.1 Graphite furnace atomic absorption spectrometer. equipped with a
graphite furnace atomizer and a chrome hollow cathode lamp.
4.2 Analytical balance. with a sensibility of 0.1mg.
5 Analytical procedures
5.1 Pretreatment of sample
of the samples to be tested, and in accordance with the migration test methods
and test conditions specified in GB 5009.156 and GB 31604.1. MIX the soaking
solution fully and evenly. TAKE some of the soaking solution for analysis. If the
soaking solution is neutral or basic, ADD appropriate amount of nitric acid so
that the concentration of nitric acid in the test solution is about 5% (volume
fraction). In the meantime, CARRY out the sample blank test.
5.2 Determination
5.2.1 Instrument reference conditions
SEE Table A.1 for the instrument reference conditions.
TAKE 10μL of chromium standard series solution and 5μL of ammonium
dihydrogen phosphate solution (20g/L), respectively (optimal injection volume
can be determined according to the instruments in use). In the meantime,
INJECT into a graphite furnace for the determination of absorbance. PREPARE
the standard curve by taking the concentrations of standard series as x-
coordinates and the corresponding absorbance as y-coordinates.
5.2.3 Determination of sample solution
TAKE 10μL of blank solution and sample soaking solution as well as 5μL of
ammonium dihydrogen phosphate solution (20g/L), respectively (optimal
meantime, INJECT into a graphite furnace. DETERMINE its absorbance after
atomization. COMPARE with the standard series for quantitation.
12 Analytical procedures
12.1 Pretreatment of sample
Same as Subclause 5.1.
12.2 Determination
12.2.1 Preparation of standard curve
DRAW 0mL, 0.250mL, 0.500mL, 1.00mL, 1.50mL, 2.00mL, 2.50mL and 3.00mL
of chromium standard solution. TRANSFER to a 50.0mL volumetric flask,
standard series solution to a 100mL conical flask. ADD two glass beads and
several drops of sulfuric acid solution (2.5mol/L) and potassium permanganate
solution (3g/L). MIX evenly. BOIL to about 30mL [after the reddish color
disappears, ADD potassium permanganate solution (3g/L) again until the
reddish color appears]. After cooling, ADD 25.0mL of urea solution (200g/L).
MIX evenly. Dropwise ADD sodium nitrite solution (100g/L) until the reddish
color disappears. ADD saturated sodium hydroxide solution until the mixture is
basic (pH = 9). LET it stand for 2h. FILTER afterwards. ADD water to filtrate to
100mL. MIX evenly. TAKE 20.0mL of this solution. ADD it to a 25mL colorimetric
pyrophosphate solution (50g/L). MIX evenly. ADD 2mL of diphenylcarbazide
solution. ADD water to 25.0mL. MIX evenly. LET it stand for 5min. DETERMINE
the absorbance at 540nm. PREPARE the standard curve by taking the
absorbance as y-coordinates and the chromium mass as x-coordinates.
12.2.2 Determination of sample solution
TAKE 50.0mL of sample soaking solution. ADD it to a 100mL conical flask. ADD
two glass beads and several drops of sulfuric acid solution (2.5mol/L) and
potassium permanganate solution (3g/L). MIX evenly. BOIL to about 30mL [after
the reddish color disappears, ADD potassium permanganate solution (3g/L)
solution (200g/L). MIX evenly. Dropwise ADD sodium nitrite solution (100g/L)
until the reddish color disappears. ADD saturated sodium hydroxide solution
until the mixture is basic (pH = 9). LET it stand for 2h. FILTER afterwards. ADD
water to filtrate to 100mL. MIX evenly. TAKE 20.0mL of this solution. ADD it to
a 25mL colorimetric tube. ADD 1mL of sulfuric acid solution (2.5mol/L) and 1mL
of sodium pyrophosphate solution (50g/L). MIX evenly. ADD 2mL of
diphenylcarbazide solution. ADD water to 25.0mL. MIX evenly. LET it stand for
5min. DETERMINE the absorbance at 540nm. In the meantime, CARRY out
the sample blank test.
   
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