Question

6. A filter paper with bigger holes/pores will make the process of filtration faster.
However, a filter paper with very large pores is not recommended for the process
of filtration. Explain why.
(3 marks)​

Answer 1

Explanation:

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Mohomed Niyas Mohomed Shayan

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.In my results the slope of curves got from Microplate reader is seems less (less than 1) and negetive some times. What is the reason for that?

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Jan 4, 2021

In my research I'm enumeraring the florescence intensity (FI) Vs E-coli concentration in river water. I measure FI by Tecan I control 200 pro and E-coli by Membrane filtration.

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Prayasee Baruah

Jan 7, 2021

Answer

This happens when the reader is not sensitive enough to detect the fluorescence of the samples. You can try increasing the concentration of the measured substance

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Erika Nascimben Santos

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How to characterize the pore size of membrane filtration with bubble point method?

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Nov 17, 2020

Hello everyone,

I am having troubles with the bubble point measurement to find the pore size of my self-fabricated microfiltration membrane, and I couldn't find a proper answer anywhere else.

It is possible to follow La Place equation to find the pore size: Diameter = (4 x surface tension of the liquid x cosine of angle) / pressure

This measurement is done by applying increasing pressure until when we see the bubbles in the surface of the membrane, which means the angle is 0°, therefore cosine 0° = 1.

According to this equation, for example, a membrane with diameter 0.1 micrometers requires a pressure of 28.8 bars, which is a extremely high value.

Is there any limitations of the use of this equation?

I've seen many commercial membranes in which both the pore size and the bubble point pressure are given by the producer and they never match (for example, there is a 0.1 micrometer membrane in which the producer claims the pressure for bubble point is 1.2 bar).

Also, I've seen lots of manuscripts that use this method and equation, but they just mention the equation and the result of the pore size, without ever mentioning the pressure needed. And I don't understand how they can find pore sizes of 0.1 micrometer range.

Answer 2

Answer:

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