论文部分内容阅读
洋芋粉中的微量铅来源于泥沙污染和土壤,含有机质较多,预处理较麻烦。常用的湿热消化法(称预处理法),用酸量大,费时且不经济。笔者改用增加首次消化液用量,放置过夜后热消化(称预处理Ⅰ法),即在称样后先加50ml硝酸—高氯酸(4:1),放置过夜后小火挥去约剩20ml酸,放冷后加10ml硫酸,下同预处理Ⅰ法。最后用双硫腙比色法测铅。两种预处理方法的比较同一种洋芋粉用两种预处理方法处理,测得铅的结果表明差异
Potassium in potato starch comes from sediment pollution and soil, contains more organic matter, pretreatment more troublesome. Commonly used wet digestion (pretreatment method), with a large amount of acid, time-consuming and uneconomical. I used to increase the amount of the first digestive juice, placed overnight after digestion (known as pretreatment Ⅰ method), that is, after the sample first added 50ml nitric acid - perchloric acid (4: 1), placed overnight after a small boil wave left 20ml acid, let cool and add 10ml sulfuric acid, the same pretreatment I method. Finally, dithizone colorimetric method to measure lead. Comparison of two pretreatment methods The same potato powder with two pretreatment methods, the measured lead results show that the difference