In the past, in Nantah, the undergraduate chemistry experiment was in summer, and the students put sodium hydroxide solid on the stool as a prank. When I sat on it, I felt as if I had been scalded by an iron, but fortunately I reacted quickly and my pants hurt. You'll be fine after washing. I was so angry that I would never associate with those people again, but I didn't report it.

In graduate school, in order to save money, disposable plastic bottles are not used, and most of them are glass bottles. Cell adhesion has very high requirements on the glass surface, so cells with a little impurity can't attach and die in pieces, so the bottle is washed with chromium pickling solution, which is composed of potassium dichromate powder and concentrated sulfuric acid.

It's no use doing experiments when you first go. Wash the bottle first. Take out a big bag of twenty or thirty glass bottles from the chromium pickling solution, pour out the washing solution, and then rinse it repeatedly with tap water.

The faucet in the laboratory is not splash-proof. Please press it first.

There was nothing then. A few days later, I found that the cloth on my shoes was crisp, and a poke with my finger was a hole. Then I found that the newly bought down jacket had become a tattered suit, with a small hole in the front and the cuffs began to open.

The water splashed on the bottle by the faucet landed on the edge of the pool. When washing bottles, it is inevitable that the front skirt will rub against the pool, and the water will flow down from the outside of the pool and drip on the shoes. White coats are not waterproof, and when they are wet, they will seep into clothes.

Although the concentration of sulfuric acid and potassium dichromate attached to the bottle after washing is low, it will be concentrated on the clothes with the evaporation of water, and the final sulfuric acid concentration can reach 70%. Coupled with strong oxidizing potassium dichromate, it corrodes clothes and even destroys the chemical fiber of down jackets.

The pool in that laboratory, 2 meters away from the ground near Fiona Fang, is full of potholes, just like being planed by a chisel, and the stainless steel pipes are covered with rust.

Later, he asked to be transferred to raise mice and said that he would not wash the bottles.

I still work very hard. I have never been bitten by a mouse (including a mouse) or pricked by a needle, and I don't think I will break it in the future. However, the emulsion is too pit, which belongs to non-volatile strong oxidizing and corrosive substances. After washing several times, the spilled water droplets will still evaporate and concentrate to produce corrosiveness, and even nitric acid is not so pitted.

Later, I went abroad to study and never saw chromium pickling solution again. Because all kinds of procedures and regulations are super troublesome, cells are cultured in disposable plastic bottles. Australia stipulates that the six major costs are swallowing poisons and inhaling highly toxic and toxic water pollutants. It is strictly forbidden to pour into the sewer in any way. Waste water and waste liquid must be put in special containers and handed over to specialized institutions for recycling.

In fact, I passed on the specific washing method, so I won't say the details, because chromium pickling solution is no longer used, and it doesn't make sense to say it. I think the chemical bosses in the comment area are particularly interested in the specific washing methods, so I'll talk about it.

Chromium pickling solution is packed in a plastic washbasin, usually half a basin of 5L.

Empty the culture bottle containing the mixed solution, rinse it with tap water, empty the tap water and put it into the collected empty washbasin.