问题 问答题

如何进行非例行样品的分析方案设计?

答案

参考答案:

在分析工作中有时会遇到一些很少接触过的非例行样品的分析,对这样的样品应从何入手,如何制订一个好的分析方案是分析工(尤其是高级分析工)所应掌握的。

收到样品后应做如下工作:

(1)了解情况,向送样人(或单位)了解样品来源、取样地点、分析目的、分析项目等。通过了解和分析情况初步估计出样品的组成。

(2)外观检查,如为固体样,应观察其颜色、大约密度、颗粒大小、结晶情况、气味等,如为液体样品,还应观察透明度、黏度等。

(3)初步试验,进行溶解度、酸碱度、灼烧等试验。液体样品还可以测定其密度。基本确定其为无机物还是有机物。

(4)定性鉴定,如为无机物可根据各种离子的特效反应进行离子鉴定。如为有机物,则可以进行有机物定性分析,利用色谱、红外光谱、极谱、质谱等仪器进行定性。

(5)查阅资料,在确定样品的基本组成后,查阅相关资料,为设计分析方案作准备。

(6)进行分析方案设计,根据实验室条件选择分析方法,在保证准确度的基础上尽量用简单、快速的方法,同时要考虑干扰离子及消除干扰的措施。

(7)根据分析方案进行验证试验,通过验证试验不断完善分析方案。

(8)正式开始分析检验工作。

(9)通过试验没有问题的分析方案应归档保存。

阅读理解

Which boy hasn’t dreamed of being a cool secret agent (特工)? The wonderful fighting abilities and the world-saving adventures are much more colourful than most people’s everyday lives. Well, Cody Banks is just like any other boy,except that he is not just dreaming. He has a big secret his friends never know about. He was trained to be a spy (间谍)by a special CIA programme,which was made to look like a summer camp. He learned high-speed driving,hand-to-hand fighting and the use of high-tech tools.

After proving he could become a young hero by saving a baby from a runaway car,Banks gets his first real task. He must make friends with a popular girl at school,Natalie Connors. Then,he must spy on her father,a scientist who has developed a dangerous technology (技术).Banks must stop a group of bad people from forcing Natalie’s father into using the technology to endanger the world.

The CIA may have taught him first-class self-defence moves,but they didn’t show him how to talk to girls. Banks has zero ability when it comes to dealing with girls. How can he get around his problem and get an invitation to the girl’s upcoming birthday party? Will he finally become Natalie’s boyfriend and find out whatever he can about her father’s work?

Agent Cody Banks has everything that young people are interested in: big explosions, breath-taking performances and funny girl-dating experiences. It was listed No.2 in the American box office last week.

“This story is interesting and fun for the whole family to enjoy,and especially cool for young boys,” said Paul Perkins, a film reviewer in theUS.

小题1:What is Banks’ first real task?

A.To test a high-tech tool.

B.To save a baby from a car.

C.To study a new technology.

D.To watch a scientist secretly.小题2:Banks wanted to go to Natalie’s birthday party to______ .

A.meet her father

B.know more people

C.make friends with her

D.steal some information小题3:What is considered as a great danger in the text?

A.The technology developed by Natalie’s father.

B. An explosion set off by some bad people.

C.The CIA’s training of boys for its tasks.

D.Secret agents’ spying on scientists.小题4:What is the purpose of the text?

A. Making known the work of the CIA.    B.Telling the story about a cool boy.

C. Showing the dark side of science.      D.Introducing a new film.

单项选择题