11. Infrared spectrometry in fuel analysis Flashcards

1
Q

If increasing the wavelength (moving from left to right) energy is decreasing.

A

true

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2
Q

What is type of interaction with matter using IR spectroscopy?

A

molecule vibration

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3
Q

Define what is on IR spectra x and y

A

X axis wavenumber (cm-1)
Y-absorbance/transmitance

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4
Q

With IR spectroscopy we can determine bonds and functional groups?

A

true

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5
Q

what is FTIR?

A

Used to determine the FAME (fatty acid methyl esters) content in fuels.
It is a transmission measurement technique

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6
Q

What is radiation source in IR spectrometry?

A

In mid-infrared- a heated rod made of varbide/rare oxides or ceramic rod
In near infrared- tungsten light bulb (electric light that produces visible light by heating a tungsten filament to a high temperature)

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7
Q

Reflection measurements are suitable for samples that do not transmit IR radiation.

A

yes

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8
Q

IR light interaction: The fuel sample is exposed to IR light. Different chemical bonds (e.g., C–H, C=O) in the fuel absorb light at characteristic wavelengths.

A

true

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9
Q

Infrared (IR) spectrometry in fuel analysis works by measuring how a fuel sample absorbs infrared light at specific wavelengths, which correspond to the vibrational modes of molecular bonds.

A

true

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10
Q

IR spectroscopy is used in both: quantitative and qualitative analysis

A

true, concentration and chemical groups can be identified

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11
Q

What is Interferometer ?

A

Its a key component of FTIR.
It allows the simultaneous measurement of all wavelengths in the infrared spectrum, enabling fast, accurate, and detailed analysis of fuel composition and properties.

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