What precautions should be taken when using filter needles to filter samples?

1. The needle filter has different membrane materials, and the membranes of different materials have different applications. The membrane suitable for sample filtration should be selected according to the experimental needs;

2. Connect the needle filter to the syringe, and tighten it gently to ensure a good seal;

3. The needle filter is divided into two types: sterilization and non-sterile. The sterilized needle filter needs to be pretreated before use. After the filter is installed, rinse the filter system with clean water, and then filter after cleaning. operate;

4. Before inhaling the sample, it is necessary to suck about 1ml of air into the syringe, which can minimize the liquid residue;

5. The operation should be carried out according to the steps to ensure the recovery efficiency. First, inhale the sample into the syringe, invert the syringe and clear all the residues at the top. Then filter the sample in the syringe and inject it into the sample bottle, and finally remove the filter. filter, draw air into the syringe, reconnect the filter, and push out any residual sample.

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