30 Questions
What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?
SAK 254
What does the SAK 254 method help determine in water samples?
Dissolved organic contents
What must be done to the water sample before using the SAK 254 method for measurement?
Filtering
What is the pore size of the membrane filter required for filtering raw and drinking water for SAK 254 measurement?
0.45 µm
At what wavelength is the measurement carried out photometrically in the SAK 254 method?
$\lambda = 254$ nm
What does the spectral absorption coefficient at 254 nm characterize in water samples?
Organic substances
What does the spectral attenuation coefficient µ measured at a wavelength of 254 nm, represent?
Sum of spectral absorption and scattered-coefficient at 254 nm
How is the light reduction in the water sample measured?
By Lambert-Beer law
What is the significance of using a 0.45 µm filter during membrane filtration?
To remove most contents in the water sample
What can cause false results in the measurements?
All of the above
What is the dependence range suitable for measurements according to the text?
$0.01 \text{ mol/L} < \text{concentration} < 2$
What does the corrected spectral attenuation coefficient measure?
Stray-light corrected spectral attenuation coefficient at 254 nm
What is the measurement wavelength for the water sample with a spectrophotometer?
$\lambda = 254$ nm
What is used to wash the quartz measuring cell?
$2 \text{ mol/L}$ hydrochloric acid solution
What is used for membrane filtration?
$0.45 \mu m$ syringe filter
What does the SAK 254 method help determine in water samples?
Presence of dissolved organic substances
What is the significance of using a 0.45 µm filter during membrane filtration for SAK 254 measurement?
To filter out dissolved organic substances for measurement
What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?
SAK 254
What must be done to the water sample before using the SAK 254 method for measurement?
Filter the water sample with a 0.45 µm filter
What does the spectral absorption coefficient at 254 nm characterize in water samples?
Presence of dissolved organic substances
What is used for membrane filtration before carrying out the SAK 254 measurement?
0.45 µm membrane filter
What is the measurement wavelength for the water sample with a spectrophotometer?
254 nm
What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?
α(λ)
What must be done to the water sample before using the SAK 254 method for measurement?
Filtering with a 0.45 µm filter
What does the spectral attenuation coefficient µ measured at a wavelength of 254 nm, represent?
Sum of spectral absorption coefficient and spectral scattered-coefficient
What can cause false results in the measurements?
Degassing oxygen or carbon dioxide
What is the significance of using a 0.45 µm filter during membrane filtration?
To remove most contents in the water sample
What does the corrected spectral attenuation coefficient measure?
Stray-light corrected spectral attenuation coefficient
What is used to wash the quartz measuring cell?
Cell cleaning solution
What does the spectral absorption coefficient at 254 nm characterize in water samples?
Spectral absorbance (extinction)
This quiz covers the practical aspects of water, air, and soil analysis, focusing on photometry for SAK 254, nitrate, and iron tests. It includes theoretical background, designation, and characterization methods for dissolved organic water constituents.
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