S M A R T P H O N E S P E C T R O S C O P Y : B E E R - L A M B E R T
L A W
I N D U S T R I A L C H E M E S T R Y - I N S T R U M E N T A L A N A L Y S I S ( Q I - 5 4 3 )
V A L E N T I N A L O N D O Ñ O - M A R I A C A M I L A S A A V E D R A
T=I1/I0
CONCLUSIONS
Molecular absorption spectroscopy is
an instrumental technique to
measure how much light, within the
UV-visible region of the
electromagnetic spectrum, is
absorbed by a substance.
OBJECTIVES:
A=-log(T)
Beer-Lambert Law
A=EbC
INTRODUCTION
-Prove Beer-Lambert's Law
-Identify uses of spectroscopy.
- Explain variables that influence
of the absorbance determination.
WHAT DO WE
NEED?
-5 equal packages.
-Flashlight.
-Smart phone.
-Coloring drink.
-Water.
-An object of measurement.
-A green filter.
-Fill containers
with equal amount
of water
-Measure light
intensity.
-Add colorful
drink, different
amounts.
-Measure light
intensity again.
RESULTS
TABLE 2
TABLE 1
TABLE 3
GRAPHICS
ANALYSIS OF RESULTS
With the results we can say:
-Transmittance is inversely
proportional to concentration.
-Absorbance is directly
proportional to concentration
-The graphs obtained show us
that the beer law was fulfilled.
-With the transmittance of the
samples, we can obtain the
concentration without problem.
LIMITATIONS
-A limitation is that it must be a place
where there is not much light.
-The wrong choice of filter color can
damage the results.
STRENGTHS
-It is an easy to understand method.
-Materials easy to get at home.
METHODS
- All concepts studied were verified.
-Spectroscopy is of great importance in
chemical analysis.
REFERENCES
Crouch, S., & Skoog, D. (2018). Principles of Instrumental Analysis Seventh
Edition.
Video guía para realizar el experimento. https://www.youtube.com/watch?
v=0954J_5NI88&ab_channel=RoyalSocietyOfChemistry
Castro, E; Federman. Análisis Instrumental Algunos métodos Fotométricos y
Electrométricos Apuntes de Clase.
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