问题 问答题 简答题

简述等离子体发射光谱法的分析原理。

答案

参考答案:

(1)高频发生器产生的交变电磁场,使通过等离子体火炬的氩气电离、加速并与其他氩原子碰撞,形成等离子体;

(2)过滤或消解处理过的样品经进样器中的雾化器被雾化,并由氩载气带入等离子体火炬中被原子化、电离、激发;

(3)不同元素的原子在激发或电离时可发射出特征光谱,特征光谱的的强弱与样品中原子浓度有关,与标准溶液进行比较,即可定量测定样品中各元素的含量。

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Dear Annie,
     Thank you your letter.I'm glad you like your schoo1.
     I go to school from Monday  2 Friday.We 3  four classes in the morning and two classes in the afternoon.We
have many things  4   after Class.On Monday and     Wednesday afternoon we have  5  .On Tuesday afternoon
some of   6     have a  7    class and  on Thursday afternoon  some have  a  drawing class.On Friday afternoon we    
practice  8   English.My Chinese friends would like  9  with me in English.They think I am like an English teacher.
Isn't it great?
     I have a good friend. She is Lingling. She 10 a beautiful girl. She    11    in Shanghai. She is a clever girl. She likes 
  12 . After school we often 13   water for her grandma, and sometimes we      14           dinner at her grandma's home.
     On Saturdays and Sundays I       15    go to schoo1.Very often I go to the parks and have a good time with my
family there.
                                                                                                                                                                         Yours,
                                                                                                                                                                         Alice
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( )12.A. drawing
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