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Lab Report Cu Aas

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Lab report

Determination of copper in unknown samples by

Flame Atomic Absorption Spectrometry

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Abstract

The purpose of this lab was to carry out the Atomic Absorption Spectrometry

(AAS) assay to determine copper in two dried unknown samples. Flame AAS is an

instrumental analytical technique used for quantitative determination of metals in solution.

In the first unknown sample, the content of copper was determined to be 1.41ppm, while

in the second sample, concentration of Cu

was 1.77 ppm. The series of standard solutions

used for the construction of calibration curve was made in the concentration range 1ppm

to 5 ppm by dilution of the copper stock solution. The AAS proved to be a sensitive, precise

and simple instrumental technique for quantitative copper determination, having the high

specificity and relatively low cost per analysis.

Introduction

Atomic absorption spectrometry measure the amount of light absorbed by the

sample when the light of a specific wavelength passes through it. There are five basic

components of an atomic absorption spectrometer (Figure 1):

1. The light source that emits the spectrum of the element of interest.

2. An "absorption cell" in which atoms of the sample are produced (flame, graphite

furnace, MHS cell, FIAS cell, FIMS cell).

3. A monochromator for light dispersion.

4. A detector, which measures the light intensity and amplifies the signal.

5. A display that shows the reading after it has been processed by the instrument

electronics.

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Lab report Determination of copper in unknown samples by Flame Atomic Absorption Spectrometry Abstract The purpose of this lab was to carry out the Atomic Absorption Spectrometry (AAS) assay to determine copper in two dried unknown samples. Flame AAS is an instrumental analytical technique used for quantitative determination of metals in solution. In the first unknown sample, the content of copper was determined to be 1.41ppm, while in the second sample, concentration of Cu2+ was 1.77 ppm. The series of standard solutions used for the construction of calibration curve was made in the concentration range 1ppm to 5 ppm by dilution of the copper stock solution. The AAS proved to be a sensitive, precise and simple instrumental technique for quantitative copper determination, having the high specificity and relatively low cost per analysis. Introduction Atomic absorption spectrometry measure the amount of light absorbed by the sample when the light of a specific wavelength passes through it. There are five basic components of an atomic absorption spectrometer (Figure 1): 1. The light source that emits the spectrum of the element of interest. 2. An "absorption cell" in which atoms of the sample are produced (flame, graphite furnace, MHS cell, FIAS cell, FIMS cell). 3. A monochromator for light dispersion. 4. A detector, which measures the light intensity and amplifies the signal. 5. A display that shows the reading after it has been processed by the instrument electronics. Figu ...
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