Lin Gao Qiming

Chapter 1312 AES
The next morning, Ge Xinxin came to the laboratory.She took off the dried glass plate and brought it back to the office, and compared it with the photos stored in the back one by one.

"This one, um, is dark. Alas, it's really reversed and looks really troublesome. Forget it, let's deal with it."

她取出自己的Mac Pro，把存储卡里的相片在Photoshop里取反色再和底版对照暗部和亮部细节。反复比对后，发现1/25快门所得底版曝光和1/100快门所得数字底片曝光最为接近，1/12快门的底版则和1/50数字底片最为接近。

"Very good, 12 is set, that's it for this batch." After recording the number in the small notebook at hand, Ge Xinxin closed the computer and locked it.

Ge Xinxin has been busy outside for several days.The directly affiliated Machinery General Factory has visited the industrial port several times.Although there was an approval from the Planning Institute, the oxyhydrogen welding machine she applied for was still not available right away—since the successful trial production of this thing, there have not been a few produced in total. It is obviously impossible to give the station to the laboratory.The answer given to her by the machinery factory was to get the number and queue up.

"Then what number do I have to line up?"

"Number 13." Zhan Wuya, who was covered in oil, picked up one of the piles of wooden clips on the table and looked at it.

"That's unlucky." Ge Xinxin said, "Can I advance one date?"

"Then it's the 14th." Zhan Wuya smiled slightly, "The 14th is also unlucky. If it's not very auspicious, you can come to the 16th, and the 18th will be fine too."

"No, no, I'm still on the 13th." Ge Xinxin smiled regretfully, "About how many days?"

Zhan Wuya looked at the "Summary of Production Plan" on the wall, and said, "Let's be optimistic and say it will take another six months."

"Six months!"

"It's almost six months." Zhan Wuya said, "This thing uses direct current. We can't make a qualified transformer right now, so we can only install a power generator in every place where we plan to use hydrogen-oxygen welding machine." machine……"

"Okay, but you have to deliver it to my door."

"Of course, I don't dare to let you use it directly, otherwise the laboratory will be burned down, and I will have to work hard for the two seasons. Free installation and installation..." Zhan Wuya wrote a list of numbers and stuffed it in Ge Xinxin said, "I'll send someone to install it when it's ready. Do you know how to use this thing?"

"will use--"

"I dare say that you will definitely not be able to use it if we make it—the difficult version. Don't treat the equipment in this time and space with the standards of the old time and space. Safety first." Zhan Wuya felt a little worried.

Ge Xinxin failed, but the experiment waited for no one. Since the hydrogen-oxygen welding machine would not be able to solve the problem for a while, the hydrogen-oxygen flame would be useless, so she had to use the Bunsen burner first.Anyway, this is what Bunsen used when he observed the spectrum for the first time.

It took Ge Xinxin a long time to get the project, and she just wanted to produce AES: Atomic Emission Spectroscopy with the current and upcoming industrial level of the Senate.

The so-called atomic emission spectroscopy is to use the atomic or ion emission characteristic spectrum of each element under thermal excitation or electric excitation to judge the composition of the substance, and perform qualitative and quantitative analysis of the elements.It can analyze about 70 metal and non-metal elements.This method can be effectively used to measure high, medium and low levels of elements.It is of great significance to metallurgy, chemical industry and material science.It can be said that once this technology is mastered, there will be a qualitative leap for the Lingao industrial system.

The purpose of setting up various heavy industry central laboratories is to provide quantitative and qualitative analysis services for raw materials, molten samples and finished products in metallurgy, cement, chemical and other industries in the Lingao heavy industry system.The means are mainly chemical and physical analysis.

The analysis results that such analysis means can provide are also relatively simple.Ge Xinxin's intention is to conduct micro and semi-micro quantitative analysis in batches through this project.No matter it is optical glass material or metallurgy, there is no need to rely on constant analysis to detect a certain composition but to directly measure the composition.It plays a vital role in some of the most critical industries that need breakthroughs in the current industrial system of the Senate: alloy materials, special steel, and optical glass.

At present, the Ministry of Science and Technology has a batch of CCD spectrometers in its hands, including small devices such as fiber optic spectrometers produced by Ocean Optics.

Although the performance of the professional equipment brought by D-Day can be called an "artifact", Ge Xinxin decided to completely rely on her own means to rebuild this system, otherwise once the equipment is damaged, this link may be "lost" for a long time.This would be a great loss to the industrial system of the Senate, which needs to make up many links, and the amount of equipment brought is limited. The industrial scale of the Senate is constantly expanding, and it is impossible to equip these rare and precious equipment everywhere.

Two days later, two soldiers from the guard battalion brought her a small wooden box marked "Secret, Dear Parents".She opened the box and inside was a Bunsen burner
The Bunsen burner is a mature gas fuel in the current Lingao industrial system.The heavy industry central laboratory is specially equipped with a gas station, which supplies gas to the entire experimental building through pipelines, which is very convenient to use.

It is not difficult to manufacture Bunsen burners, so the machinery factory has long produced this kind of heating tool that can generate high temperature and is commonly used in laboratories. Lights are no different.It can reach a high temperature of 900°C in the outer flame.

However, the ready-made Bunsen burner cannot be used directly - when Bunsen first tested the spectrum, he mainly used metal salt compounds, which were dipped with platinum wire and then directly burned on the flame for observation.This method is relatively primitive, and Ge Xinxin uses the atomization method—this kind of observation results are more accurate.

The atomization method is to connect the sample solution digested with nitric acid or aqua regia to the oxyhydrogen flame nozzle through a thin tube, and use the negative pressure of the air flow to inhale and atomize it.The atomized sample is excited to emit light in the flame.Now that she doesn't have a hydrogen-oxygen welder, she first modifies a Bunsen burner to replace it—the Bunsen burner packed in a wooden box was sent to the machinery factory for modification a few days ago: a thin tube is connected to the nozzle , used to suck the sample solution into the nozzle.

Ge Xinxin carefully took out some equipment from the laboratory vault.These are controlled materials brought from the warehouse of the Planning Institute.She put on pure cotton knit gloves, and carefully installed the equipment on the equipment rack ordered from the machinery factory a few days ago.

There is a convex lens and two boxes of gratings: a box of diffraction gratings and a box of reflection gratings. This fragile product cannot be made by Lingao for a long time, so it must be used with care.

However, as long as it is carefully maintained and used carefully, it will not be a problem to use it for decades.

The detection optical path she designed is Bunsen burner flame-convex lens-slit-grating-slit-cassette-negative plate.

Before that, she did a series of preparatory work. First, she took the recrystallized and purified sodium ferrocyanide and sodium chloride, and took the complete and flawless crystals and crushed them to prepare a concentration sequence of 0.1M-10^-8M. solution.

The so-called sodium ferrocyanide is sodium ferrocyanide, also known as yellow blood salt sodium, yellow sodium.It is a light yellow crystal.She is going to use this thing as a basic reagent.This compound was chosen because it is currently available in bulk from the Senate chemical industry.It is obtained by co-heating the waste oxide obtained from the gas plant with lime to produce calcium ferrocyanide solution, adding boiled salt solution, co-heating with sodium carbonate solution, and concentrating and crystallizing.

After lighting the Bunsen burner, dip the thin tube attached to the burner into pure water.The pure water used in the laboratory is laboratory secondary water prepared by multiple distillations with quartz vessels in the reagent room.Can make do with.

Then Ge Xinxin opened the 1st, 4th, and 7th slits and exposed for 10 minutes to take the spectrum of the blank solution.

接着她将溶液换为0.1mol/L亚铁氰化钠，打开第2、5、8条狭缝，曝光5分钟以拍摄亚铁氰化钠溶液受激发出的光谱。换成纯水用纯水润洗细管2分钟。

再将溶液换为0.1mol/L氯化钠，打开第3、6、9条狭缝，曝光5分钟以拍摄氯化钠光谱。换成纯水用纯水润洗细管2分钟。

将底版向上摇动2cm，拍摄10^-2mol/L氯化钠的光谱，并同理拍摄到10^-8mol/L，以及未知浓度（~10^-3mol/L）的NaCl。

After the filming was completed, Ge Xinxin packed up the experimental equipment——she dared not hand over the gratings to the trainee experimenters.She removed the cassette, closed the curtains, lit the red paper flashlight, and took out the washing equipment, developer, and fixer prepared a few days ago to develop and fix the glass bottom plate.

After getting the raster photo, project it on the enlarging machine and overlap it with the pre-printed standard ferrogram.

By comparing the Na spectrum with the standard ferrogram, locate each wavelength of the standard ferrogram.And subtract the corresponding background of pure water and sodium chloride.Then look up the relevant tables, compare the gray scales of the seventh to ninth order spectral lines of NaCl at various concentrations, and obtain the linear range of the glass negative plate.And estimate the concentration of the solution of unknown concentration.

Titration of Cl- using AgNO3, determination of NaCl concentration, and comparison by semi-quantitative estimation by AES.It can be used if there is little difference.

After finishing the whole set of experiments, Ge Xinxin was quite satisfied with the results.In the next step, she plans to use a CCD spectrometer to compare and calibrate today's experimental results.However, generally speaking, the spectrophotometric atomic emission spectrometry can be regarded as a successful development.This 17th-century black technology is half the battle.

(End of this chapter)