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Topic: turbidity measurement  (Read 4320 times)

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Offline shavira

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turbidity measurement
« on: July 31, 2013, 12:13:54 AM »
Can anyone know different between measure turbidity using turbidimeter and Uv-spectrometer?
I found different result of turbidity by using different device.
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Offline curiouscat

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Re: turbidity measurement
« Reply #1 on: July 31, 2013, 12:28:30 AM »
Quote from: shavira on July 31, 2013, 12:13:54 AM
Can anyone know different between measure turbidity using turbidimeter and Uv-spectrometer?
I found different result of turbidity by using different device.

Don't think a Uv-spectrometer measures turbidity. Maybe you could sort of hack it to.
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Offline shavira

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Re: turbidity measurement
« Reply #2 on: July 31, 2013, 02:40:47 AM »
sorry, i mean spectropgotometer  ;D
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Offline JGK

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Re: turbidity measurement
« Reply #3 on: July 31, 2013, 05:54:24 PM »
You could use a UV spectrophotometer to perform turbidity assays.

A turbidimeter is just a single purpose spectrophotomenter. The one in our lab is hard wired for wavelength, turbity calibration and result output.
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Offline shavira

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Re: turbidity measurement
« Reply #4 on: July 31, 2013, 10:56:21 PM »
JGK, do you ever try to compare result with turbidimeter? I had different value almost double figure.
Thx
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Offline Archer

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Re: turbidity measurement
« Reply #5 on: August 01, 2013, 04:42:18 AM »
Ever wondered why a turbidimeter sample bottle is cylindrical?

Turbidity is much easier to measure by the scattering of light. In a normal UV/Vis the detector is in line with the light source, in a turbidimeter it is at an angle to it. In a UV absorbance has no units, in tubidity the units are Nephelometric Turbidity Units (NTU) usually.

It is possible to measure in a normal UV / Vis but your results will be different so it needs to be calibrated differently.
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Offline curiouscat

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Re: turbidity measurement
« Reply #6 on: August 01, 2013, 04:45:20 AM »
Quote from: JGK on July 31, 2013, 05:54:24 PM
A turbidimeter is just a single purpose spectrophotomenter.

Isn't one measuring scattered light and the other transmitted?
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Offline Archer

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Re: turbidity measurement
« Reply #7 on: August 01, 2013, 05:50:39 AM »
Quote from: curiouscat on August 01, 2013, 04:45:20 AM
Isn't one measuring scattered light and the other transmitted?

Yes, see my post above.
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