Chemical laboratory is the key unit of fire control, and it is also a place prone to accidents. Safety is always the first. Subjectively speaking, there are two reasons for the accidents in chemical experiments: one is that the safety consciousness is not strong, and the other is that they do not know or know little about the situation of the chemical laboratory
the so-called safety mainly refers to “Three Preventions”, that is to prevent poisoning, explosion and combustion, corrosion, chemical burning, scalding and cutting< Most chemicals have different degrees of toxicity. Toxic chemicals can enter the human body through respiratory tract, digestive tract and skin, resulting in poisoning. 1f HF invades human body, it will damage teeth, bone, hematopoiesis and nervous system; Hydrocarbons, alcohols, ethers and other organic substances have different degrees of anesthetic effect on human body; Arsenic trioxide, cyanide and mercuric chloride are highly toxic substances, which can be fatal if inhaled in small amount
precautions for anti-virus
before the experiment, we should understand the toxicity, performance and protective measures of the drugs used; The use of toxic gases (such as H2S, Cl2, Br2, NO2, HCl, HF) should be carried out in the fume hood; Benzene, carbon tetrachloride, ether, nitrobenzene and other vapors are often inhaled for a long time, which will weaken people’s sense of smell; Organic solvents can enter the human body through the skin and should avoid direct contact with the skin; Highly toxic drugs such as mercury salt, cadmium salt and lead salt should be kept properly; The experimental operation should be standardized, and the hands should be washed when leaving the laboratory