简述火焰光度法测定食品中钠、钾的原理及操作步骤
1.原理样品处理后,导入火焰光度计中,经火焰原子化后,分别测定钾、钠的发射强度,其发射强度与它们的含量成正比,与标准系列比较定量。2.主要仪器:火焰光度计3.操作步骤(1)样品处理:(2)测定1)钾的测定2)钠的测定
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Passage 2 What do video cassettes, ice cream, pizzas, whisky and bouquets of flowers all have in common? The answer is that in Japan they can all be bought from a vending machine (自动售货机). Japan boasts more vending