饲料添加剂 苏氨酸锌螯合物

1、DB43湖 南 省 地 方 标 准DB43/T XXXXXXX 饲料添加剂 苏氨酸锌螯合物 Feed additive Threonine zinc chelate （征求意见稿）XXXX - XX -XX发布 XXXX - XX -XX实施湖南省市场监督管理局 发 布DB43/T XXXXXXX目 次前言························&#

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84、;······························10 DB43/T XXXXXXX前 言本文件按照GB/T 1.1-2020标准化工作导则 第1部分：标准化文件的结构和起草规则的规定起草。本文件的某些内容可能涉及专利。本文件的发布机构不承担识别这些专利的责任。本文件由湖南省市场监督管理

85、局提出并归口。本文件起草单位：长沙兴嘉生物工程股份有限公司。本文件主要起草人：黄逸强、彭红星、洪双胜、钟芳、罗丹。1饲料添加剂 苏氨酸锌螯合物1 范围本标准规定了饲料添加剂苏氨酸锌螯合物的术语和定义、要求、试验方法、检验规则及标签、包装、运输、贮存和保质期。本标准适用于饲料添加剂苏氨酸锌螯合物的生产、销售和使用。2 规范性引用文件下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅所注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。GB/T 5917 饲料粒度测定方法GB/T 6435 饲料水分的测定方法GB/T 6682 分析实验室用水规

86、格和试验方法GB 10648 饲料标签GB 13078 饲料卫生标准GB/T 13079 饲料中总砷的测定方法GB/T 13080 饲料中铅的测定方法GB 13082 饲料中镉的测定方法GB/T 14699.1 饲料采样GB/T 18823 饲料检测结果判定的允许误差 3 化学名称、分子式、相对分子质量和结构式化学名称：苏氨酸锌螯合物分子式：C8H20N2O8Zn相对分子质量：337.63 (按2011年国际相对原子质量计)结构式：(C4H8NO3)2Zn·2H2O4 术语和定义本文件没有需要界定的术语和定义。5 技术要求5.1 外观与性状本品浅黄色或类白色结晶性粉末或细小颗粒，微溶

87、于水，溶于酸，无刺激性气味。5.2 技术指标表 1项 目指 标锌（以Zn计） %18.5总苏氨酸 %67.0砷（As） %0.0005铅（Pb） %0.001镉（Cd） %0.0005水分 %10.00粒度（孔径0.84mm试验筛通过率%）95.06 采样按GB/T 14699.1的规定进行采样。7 试验方法除非另有规定，本文件所用试剂和水，均指分析纯试剂和GB/T 6682中规定的三级水，所用标准溶液、制剂及制品，均按GB/T 601、GB/T 602、GB/T 603规定的方法制备。7.1 感官检验取约20g的试样置于清洁、干燥的白瓷盘内，在自然光下目视观察其色泽和状态。7.2 鉴别实验7

88、.2.1 试剂或材料7.2.1.1 盐酸溶液（1+10，v/v）：取100mL浓盐酸缓缓加入到1000mL水中，即得。7.2.1.2 氨水溶液（1+1，v/v）：取水100mL加入到100mL浓氨水中，即得。7.2.1.3 硫酸钠溶液：250g/L。7.2.1.4 10g/L双硫腙四氯化碳溶液：取双硫腙1g加四氯化碳使其溶解至100mL，即得，使用期为两周。7.2.1.5 三氯甲烷 AR。7.2.1.6 茚三酮溶液：1g/L水溶液。7.2.2 仪器设备7.2.2.1 分析天平：感量0.0001g。7.2.3 锌离子的鉴别称取0.2g试样，加（1+10）10mL（7.2.1.1）盐酸溶液，加热至

89、试样全部溶解，加5mL水，用氨水（7.2.1.2）调节试验溶液PH值为45，加两滴硫酸钠溶液（7.2.1.3），再加数滴双硫腙四氯化碳溶液（7.2.1.4），和1mL三氯甲烷（7.2.1.5），振摇后，有机层显紫红色。7.2.4 苏氨酸的鉴别7.2.4.1 茚三酮试验称取试样0.1g，溶于100mL水中，取该溶液5mL，加1mL茚三酮溶液（7.2.1.6），加热，溶液呈蓝紫色，随温度升高颜色加重。7.3 锌含量的测定7.3.1 试剂或材料7.3.1.1 盐酸溶液（1+3，v/v）：移取25 mL盐酸（优级纯或更高纯度）加入至75 mL水中，混匀。7.3.1.2 20%六次甲基四胺溶液：称取20

90、0g六次甲基四胺试剂溶解于700mL水中，然后定容至1000mL容量瓶中，摇匀备用。7.3.1.3 0.2%二甲酚橙指示剂：称取0.2g二甲酚橙指示剂于烧杯中，加适量水溶解，然后定容至100mL容量瓶中，摇匀，使用期限两周。7.3.1.4 0.05mol/L EDTA-2Na标准滴定溶液。7.3.2 仪器设备7.3.2.1 分析天平：感量0.0001g。7.3.2.2 酸式滴定管：50mL。7.3.3 方法原理将样品处理后，用酸溶解，加适量水，以六次甲基四胺调节溶液的pH值至56，以二甲酚橙为指示剂，用EDTA-2Na标准滴定溶液滴定至颜色由紫红色变为亮黄色即为终点。7.3.4 测定步骤准确称

91、取样品0.2-0.5g（精确至0.0002g），加5mL（1+3）的盐酸（7.3.1.1），加入适量水加热溶解，加2滴二甲酚橙指示剂（7.3.1.3），然后滴加六次甲基四胺溶液（7.3.1.2）至溶液呈稳定的紫红色后再过量5mL，用0.05mol/L EDTA标准溶液（7.3.1.4）滴定至溶液由紫红色突跃为亮黄色或橙黄色即为终点。7.3.5 结果计算：试样中锌含量以计，质量分数用（%）表示，按以下式（1）计算：=c×V×0.06539m×100 （1）式中： c乙二胺四乙酸二钠标准滴定溶液的浓度，mol/L；V滴定样品消耗乙二胺四乙酸二钠标准溶液的体积，mL；m称样试样的质量，g；0.06539与1.00mL乙二胺四乙酸二钠标准溶液（cEDTA-2Na=1.000mol/L）相当的锌的质量，g。测定结果以两次平形测定的算术平均值表示，结果保留两位有效数字。7.3.6 精密度在重复性条件下，两次独立测定结果绝对差值不得超过0.3%。