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An aqueous solution of hexavalent chromium was colored with a
diphenylcarbazide reagent, and the absorption spectrum was then
checked. It is evident that the maximum absorption peak is at 542
nm. By using a calibration curve, the concentration of this sample
was found to be 0.843 mg/L.
Two types of window glass were measured utilizing the ISR-2600Plus
integrating sphere.
The sample shown by the red line is highly transparent to
near-infrared light at 800 nm or more. The sample shown by the blue
line, however, is apparently not very transparent to near-infrared
light.
The diffuse reflection spectra for various textiles were measured in
the visible range utilizing the ISR-2600Plus integrating sphere. The
blue line indicates a blue cloth, and the red line a red cloth. The blue
cloth appears blue because it primarily reflects short-wavelength blue
light. The red cloth appears red because it primarily reflects
long-wavelength red light.
This shows the absorption spectra for riboflavin (vitamin B2).
The sample concentrations are, in order from the highest absorbance, 0.08,
0.04, 0.02, and 0.01 mg/mL.
Hexavalent Chromium Measurements
Environment
Window Glass Transmission MeasurementsConstruction
Diffuse Reflection Measurements of Various ClothsTextiles
Vitamin MeasurementsFoods
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