I took tert-butyl lithium in my first undergraduate experiment. After moving bricks for six years, the most dangerous one is tert-butyl lithium. I don't wear lab clothes at ordinary times, but I will definitely wear them when I use tert-butyl lithium, and I will wear two layers of gloves for people to watch just in case. Before use, blow out all instruments with a hot gun, burn a cork and flush with nitrogen, and cool it to -78℃. When taking it, attach a nitrogen balloon or constant pressure nitrogen. After washing with a syringe, lift the needle off the liquid surface, suck a section of nitrogen, and then slowly push it out, inhale and push it out to ensure that the liquid at the needle mouth is discharged, so that the needle will not catch fire when taking it out. If the needle is not threaded, hold it with one hand. Most accidents are caused by the needle falling off. ) Keep the needle down and the syringe up, and the upper parts of the needle and syringe are filled with nitrogen. Translate to the bottle mouth, then plunge into it, slowly add it, and observe the bubbling in the dry ice bath. If it's too fast, take your time. After use, I usually take out the needle, plunge it into a small bottle of THF prepared in advance, push and pull the syringe to clean the needle tube, and then rinse it with water. Direct washing will make a "beep" sound, and the needle tube is easy to block when it is thin. (Dilute hydrochloric acid/saturated ammonium chloride can be used to clean the blocked needle tube.) Finally, at least two equivalents are added to the tert-butyl used for lithium halide exchange, because the tert-butyl halide produced by lithium halide exchange will consume another equivalent to produce isobutylene, and only one equivalent is needed for hydrogen extraction. There is only one person doing this experiment in the laboratory. Colleagues are in other rooms. However, it is stipulated that there must be more than two people in the laboratory when doing experiments. This is the background. . .

1. Operation error. The investigation shows that the accident seems to be due to the excessive nitrogen pressure in the bottle (or other detailed reasons), which led to the separation of the needle and syringe and the splash of tert-butyl lithium. However, when receiving treatment, she said that she pulled out the syringe too quickly, which led to the separation of the needle and syringe. However, according to experience, it is better to take tert-butyl lithium with a threaded syringe with a needle than to stick it in a common syringe for fixation. This is the main cause of the accident.

2. Lack of protective measures. I didn't wear protective clothing and experimental clothing, which caused tert-butyl lithium to splash on my clothes and ignite. During the investigation, there was no evidence that the client wore goggles. This is the cause of serious injury after the accident.

3. Improper handling. After the accident, the client and his colleagues next door panicked, and the shower measures in the laboratory were useless. The customer was in a hurry and spilled hexane on himself. . . Water), and then FFF. . . Increase the difficulty of others' rescue. This series of subjective and objective reasons led to the death of the client, the school also lost tens of thousands of dollars, and the professor seemed to be severely punished.