标准编号:	GB 31604.4-2016
中文名称:	食品安全国家标准 食品接触材料及制品 树脂中挥发物的测定
英文名称:	National Food Safety Standard - Food Contact Materials and Articles - Determination of volatiles in resins
行业分类:	GB    国家标准
发布机构:	中华人民共和国国家卫生和计划生育委员会
发布日期:	2016-08-31
实施日期:	2016-9-20
标准状态:	valid
翻译语言:	英文
文件格式:	PDF
中文字符数:	4000 字
翻译价格(元):	120.0
交付时间:	付款后 1 个工作日

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard replaces the part specifying determination of volatiles of GB/T 5009.59-2003 Method for Analysis of Hygienic Standard of Polystyrene Resin for Food Packaging. The following main changes have been made with respect to GB/T 5009.59-2003 (the previous edition): ——This standard is renamed as "National Food Safety Standard - Food Contact Materials and Articles - Determination of Volatiles in Resins". National Food Safety Standard Food Contact Materials and Articles Determination of Volatiles in Resins 1 Scope This standard specifies determination method for volatiles in resins in food contact materials and articles. This standard is applicable to determination of volatiles in polystyrene resin in food contact materials and articles. 2 Principle The mass of volatiles is the reduced mass of test specimen due to drying for 2h at temperature of 138℃~140℃ and a pressure of 85.3 kPa subtracts the lost mass due to drying. 3 Reagents and Materials Butanone (C4H8O). 4 Instruments and Apparatus 4.1 Balance: with sensitivity of 0.1mg. 4.2 Ultrasonic cleaner: with working frequency of 35 kHz. 4.3 Vacuum drying oven. 5 Analysis Steps 5.1 Sampling method Operate according to GB 5009.156. 5.2 Weight loss on drying Operate according to GB 31604.3 National Food Safety Standard - Food Contact Materials and Articles - Determination of Resin Loss on Drying. 5.3 Volatiles Weigh 2g~3g (to the nearest of 0.1 mg) of particle specimen and put it in a 50mL beaker (with glass rod) which is weighed accurately after dried, add 20mL of butanone and stir with glass rod to fully dissolve the specimen, carry out ultrasound for 15 min, volatilize the solvent until the test specimen becomes dense and then transfer the beaker into the vacuum drying oven; close the vacuum drying oven, start the vacuum pump and dry for 2h at the temperature of 139℃±1℃ and the pressure of 85.3 kPa, then transfer the beaker into the dryer, cool it for 30 min and then weigh.

Foreword i 1 Scope 2 Principle 3 Reagents and Materials 4 Instruments and Apparatus 5 Analysis Steps 6 Expression of Analysis Results 7 Accuracy

中华人民共和国国家标准 GB31604.4—2016 食品安全国家标准 食品接触材料及制品 树脂中挥发物的测定 2016-08-31发布 2017-03-01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/T5009.59—2003《食品包装用聚苯乙烯树脂卫生标准的分析方法》中挥发物的测定。 本 标准与GB/T5009.59—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 树脂中挥发物的测定”。 食品安全国家标准 食品接触材料及制品 树脂中挥发物的测定 1 范围 本标准规定了食品接触材料及制品树脂中挥发物的测定方法。 本标准适用于食品接触材料及制品聚苯乙烯树脂中挥发物的测定。 2 原理 试样于138℃~140℃,在压力为85.3kPa时,干燥2h减失的质量减去干燥失重的质量即为挥发物的质量。 3 试剂和材料 丁酮(C4H8O)。 4 仪器和设备 4.1 天平:感量为0.1mg。 4.2 超声波清洗仪:工作频率35kHz。 4.3 真空干燥箱。 5 分析步骤 5.1 采样方法 按GB5009.156操作。 5.2 干燥失重 按GB31604.3《食品安全国家标准 食品接触材料及制品 树脂干燥失重的测定》操作。 5.3 挥发物 称取2g~3g(精确至0.1mg)的粒子试样,置于干燥后准确称量的50mL带有玻璃棒的烧杯内,加20mL丁酮,用玻璃棒搅拌,使完全溶解后,超声15min,挥发溶剂,待至试样呈浓稠状态,将烧杯移入真空干燥箱内,密闭真空干燥箱,开启真空泵,保持温度在139 ℃±1 ℃,压力为85.3kPa,干燥2h后,将烧杯移至干燥器内,冷却30min后称量。 6 分析结果的表述 试样中挥发物按式(1)和式(2)计算: ……………………(1) 式中: X2——试样于139℃±1℃,压力为85.3kPa,干燥2h失去的质量,单位为克每百克(g/100g); m1——试样加烧杯玻璃棒的质量,单位为克(g); m2——干燥后试样加烧杯玻璃棒的质量,单位为克(g); m0——烧杯玻璃棒的质量,单位为克(g); 100——换算系数。 X3=X2-X1……………………(2) 式中: X3——试样中挥发物的含量,单位为克每百克(g/100g); X2——试样于139℃±1℃,压力为85.3kPa,干燥2h失去的质量,单位为克每百克(g/100g); X1——试样中干燥失重的含量,单位为克每百克(g/100g)。 计算结果以重复性条件下获得的两次独立测定结果的算术平均值表示,结果保留两位有效数字。 7 精密度 在重复性条件下获得的两次独立测定结果的绝对差值不得超过算术平均值的10%。