A device to demonstrate the principles of photometry and three experiments for its use

Delumyea, R. Del

doi:10.1021/ed064p630

Cited by 6 publications

(6 citation statements)

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“…The light source and monochromator was a light emitting diode (LED), and the detector was a voltage divider composed of a photoresistor (CdS) in series with a fixed resistor. Texas Instrument's Calculator Based Laboratory systems interfaced to a Vernier colorimeter along with other reported colorimeters (7,8) use LEDs as light sources. This colorimeter was constructed by students and is suitable for use in introductory chemistry courses in which the fundamentals of spectrophotometric analysis are addressed.…”

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confidence: 99%

A Graduated Cylinder Colorimeter: An Investigation of Path Length and the Beer-Lambert Law

Gordon

Harman

2002

J. Chem. Educ.

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A 10-mL graduated cylinder was used to construct a colorimeter to investigate the relationship between absorbance and path length found in the Beer-Lambert law. Light-emitting diodes (LEDs) were used as the light sources and filter monochromators. The experiments were conducted on intensely colored permanganate and tetraamminecopper(II) solutions. The device also was useful for demonstrating the relationship between absorbance and concentration.

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confidence: 99%

A Graduated Cylinder Colorimeter: An Investigation of Path Length and the Beer-Lambert Law

Gordon

Harman

2002

J. Chem. Educ.

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“…With the increasing need to use technology in the classroom and laboratory, it is all the more necessary that students understand what the technology is doing. This need has been addressed in a variety of ways (1)(2)(3)(4)(5)(6)(7)(8). In this experiment, students constructed a very simple colorimeter using a typical black film canister that was slightly modified.…”

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confidence: 99%

A Film Canister Colorimeter

et al. 2002

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A low-cost, low-tech colorimeter was constructed from a film canister. The light source and filter monochromator was an interchangeable LED. The detector for this system was a voltage-divider circuit composed of a photoresistor in series with a fixed resistor. The student-constructed colorimeter was used to show the Beer–Lambert relationship between absorbance and concentration and to calculate the value of the molar absorptivity for permanganate at the wavelength emission maximum for the LED. Comparisons were made between this instrument and three commercial spectrometers and colorimeters.

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“…A flow injection analyzer is only a little more difficult to construct than a simple colorimeter (6), at about the same cost. It can yield highly sensitive analyses with use of small volumes of analyte and 1-2 mL of reagent per sample, generally 5-to 10-fold less than required for test tube analyses.…”

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confidence: 99%

“…Red and green LEDs are useful for many common procedures such as protein, phosphate, permanganate, etc. (6). Finally, even the flow cell and injection port can be homemade, significantly reducing the cost of the instrument (4).…”

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confidence: 99%