SAK 254, Nitrate and Iron Test 1

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Questions and Answers

What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?

  • Ultraviolet light measurement
  • Spectral absorption coefficient at 254 nm
  • Dissolved organic water constituents
  • SAK 254 (correct)

What does the SAK 254 method help determine in water samples?

  • Inorganic mineral composition
  • Turbidity and coloration
  • Total dissolved solids
  • Dissolved organic contents (correct)

What must be done to the water sample before using the SAK 254 method for measurement?

  • Heating
  • Carbonation
  • Filtering (correct)
  • Distillation

What is the pore size of the membrane filter required for filtering raw and drinking water for SAK 254 measurement?

<p>0.45 µm (B)</p> Signup and view all the answers

At what wavelength is the measurement carried out photometrically in the SAK 254 method?

<p>$\lambda = 254$ nm (A)</p> Signup and view all the answers

What does the spectral absorption coefficient at 254 nm characterize in water samples?

<p>Organic substances (C)</p> Signup and view all the answers

What does the spectral attenuation coefficient µ  measured at a wavelength of 254 nm, represent?

<p>Sum of spectral absorption and scattered-coefficient at 254 nm (A)</p> Signup and view all the answers

How is the light reduction in the water sample measured?

<p>By Lambert-Beer law (B)</p> Signup and view all the answers

What is the significance of using a 0.45 µm filter during membrane filtration?

<p>To remove most contents in the water sample (D)</p> Signup and view all the answers

What can cause false results in the measurements?

<p>All of the above (D)</p> Signup and view all the answers

What is the dependence range suitable for measurements according to the text?

<p>$0.01 \text{ mol/L} &lt; \text{concentration} &lt; 2$ (D)</p> Signup and view all the answers

What does the corrected spectral attenuation coefficient measure?

<p>Stray-light corrected spectral attenuation coefficient at 254 nm (B)</p> Signup and view all the answers

What is the measurement wavelength for the water sample with a spectrophotometer?

<p>$\lambda = 254$ nm (C)</p> Signup and view all the answers

What is used to wash the quartz measuring cell?

<p>$2 \text{ mol/L}$ hydrochloric acid solution (A)</p> Signup and view all the answers

What is used for membrane filtration?

<p>$0.45 \mu m$ syringe filter (C)</p> Signup and view all the answers

What does the SAK 254 method help determine in water samples?

<p>Presence of dissolved organic substances (A)</p> Signup and view all the answers

What is the significance of using a 0.45 µm filter during membrane filtration for SAK 254 measurement?

<p>To filter out dissolved organic substances for measurement (C)</p> Signup and view all the answers

What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?

<p>SAK 254 (B)</p> Signup and view all the answers

What must be done to the water sample before using the SAK 254 method for measurement?

<p>Filter the water sample with a 0.45 µm filter (C)</p> Signup and view all the answers

What does the spectral absorption coefficient at 254 nm characterize in water samples?

<p>Presence of dissolved organic substances (C)</p> Signup and view all the answers

What is used for membrane filtration before carrying out the SAK 254 measurement?

<p>0.45 µm membrane filter (C)</p> Signup and view all the answers

What is the measurement wavelength for the water sample with a spectrophotometer?

<p>254 nm (D)</p> Signup and view all the answers

What is the designation for the spectral absorption coefficient measured at a wavelength of 254 nm?

<p>α(λ) (C)</p> Signup and view all the answers

What must be done to the water sample before using the SAK 254 method for measurement?

<p>Filtering with a 0.45 µm filter (A)</p> Signup and view all the answers

What does the spectral attenuation coefficient µ  measured at a wavelength of 254 nm, represent?

<p>Sum of spectral absorption coefficient and spectral scattered-coefficient (B)</p> Signup and view all the answers

What can cause false results in the measurements?

<p>Degassing oxygen or carbon dioxide (B)</p> Signup and view all the answers

What is the significance of using a 0.45 µm filter during membrane filtration?

<p>To remove most contents in the water sample (C)</p> Signup and view all the answers

What does the corrected spectral attenuation coefficient measure?

<p>Stray-light corrected spectral attenuation coefficient (C)</p> Signup and view all the answers

What is used to wash the quartz measuring cell?

<p>Cell cleaning solution (D)</p> Signup and view all the answers

What does the spectral absorption coefficient at 254 nm characterize in water samples?

<p>Spectral absorbance (extinction) (A)</p> Signup and view all the answers

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