1. The pipette tips that have come into contact with biological samples, pathogenic microorganisms, blood serum, cell culture solutions, toxic corrosive reagents, etc., need to be placed in the sharps container. These pipette tips have sharp and hard tips. If the hand is punctured, the attached bacteria and toxic substances will easily invade the body and cause infection or chemical burns. According to laboratory biosafety and medical waste regulations, they belong to infectious injury waste with a puncture risk and are uniformly collected in a hard, puncture-resistant yellow sharps container. When full, it should be sealed and handed over to a professional institution for harmless disposal. They cannot be casually thrown into ordinary garbage bags or infectious waste bags. 

II. Only use pure water, sterile distilled water, blank buffer solution, and uncontaminated ordinary salt solution. The entire process does not involve any contact with samples, toxins, or pathogenic substances. It uses brand-new, clean pipettes that have never been used for any other purposes. There is no need to put them in the sharps container. The plastic pipettes themselves do not pose a biological contamination risk and do not carry any dangerous chemicals. They are simply treated as ordinary laboratory plastic waste and can be disposed of in regular laboratory waste bags or yellow infectious waste collection bags. This also helps reduce unnecessary consumption of materials in the sharps container. 

III. If the suction head shows any damage, cracking, or has sharp burrs at the tip, regardless of whether it has come into contact with the sample or not, it is recommended to place it in the sharps container. The sharp plastic edges after fragmentation are very sharp and can easily scratch gloves and skin, posing a physical injury hazard. If the damaged suction head is also contaminated with experimental waste liquid or biological specimens, the risk is even higher. In addition, during operation, do not squeeze or bend the suction head before discarding it to prevent liquid splashing and contaminating the environment. When disposing of it, place it gently to avoid liquid splashing. The sharps container should be sealed and replaced when it is three-quarters full. Do not stack it beyond the limit.