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Does the filter membrane standard mean that the content of this filter membrane has a standard value? Determination of coliform bacteria in water by membrane filtration method 1. objective to learn to use membrane filtration method to determine coliform bacteria in water.Two, the basic principle of membrane filtration method is to filter water samples by membrane filter,So that the bacteria trapped on the membrane,Then put the filter membrane on the appropriate medium for culture,Coliform bacteria can grow directly on the membrane,It can be counted directly.The membrane used is a porous nitrocellulose membrane or acetic acid fiber membrane,Its aperture is about 0.45 μm.Third, the equipment is red, American, blue, Agar plate or rattan agar plate,There is an inverted small sleeve in the lactose peptide fermentation tube ),Sterilized water,River or lake water;Sterilization filter (funnel, base, filter bottle with hole rubber plug, respectively,Can be sterilized by high pressure steam ),Tweezers,Clamp,Vacuum pump
What is the reason why the multi-media filter is unqualified? The filtering accuracy of the filter should be inaccurate. you can communicate with the manufacturer to see how much the filtering accuracy of the filter can be judged.
