称取新鲜的袋装奶粉1g，硫酸铜2g和硫酸钾6g于消化管中，用量筒量取20mL硫酸溶液于消化管中，此时溶液为黑色，同一试验重复操作3次，将消化管置于400℃的消化炉上进行消化4-5小时后，取出，此时消化管中的液体呈绿色透明状，取出后冷却至室温，溶液颜色由绿色透明状变成无色透明状，用量筒量取50mL蒸馏水于消化管中。将三角瓶中加入20mL硼酸溶液，再滴入2-3滴指示剂（甲基红指示剂1mL：溴

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称取新鲜的袋装奶粉1g，硫酸铜2g和硫酸钾6g于消化管中，用量筒量取20mL硫酸溶液于消化管中，此时溶液为黑色，同一试验重复操作3次，将消化管置于400℃的消化炉上进行消化4-5小时后，取出，此时消化管中的液体呈绿色透明状，取出后冷却至室温，溶液颜色由绿色透明状变成无色透明状，用量筒量取50mL蒸馏水于消化管中。

将三角瓶中加入20mL硼酸溶液，再滴入2-3滴指示剂（甲基红指示剂1mL：溴甲酚绿指示剂5mL配制而成），摇匀后放入自动凯氏定氮仪，同时将消化管也放入自动凯氏定氮仪，打开按钮将消化管中加入氢氧化钠溶液，碱化蒸馏使氨游离，硼酸吸收后，用0.05mol/L的硫酸标准滴定溶液进行滴定，滴定直至蓝色褪去，溶液变为浅粉色30不褪色为终点，记录消耗0.05mol/L的硫酸标准滴定溶液的体积。这种测定方法属于（）。
奶粉中脂肪含量的测定
奶粉中维生素A、D、E含量的测定
奶粉中蛋白质含量的测定

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农产品检验技术

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