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EXPERIMENT 4: ATOMIC ABSORPTION SPECTROSCOPIC DETERMINATION OF Zn BY LINEAR CALIBRATION AND STANDARD ADDITIONS METHODS
Abstract
Quantitative analyses require accurate and reliable measurement that relate to the composition of the sample. Atomic absorption technique was used in this experiment. In atomic absorption spectroscopic, it uses absorption or emission spectrometry to asses the concentration of analytes in the sample. Electrons of atoms in the atomizer are promoted to higher orbital for a short amount of time by absorbing a quantity of energy of at a given wavelength. This amount of energy is specific to a particular electron transition in a particular element. This gives the technique selectivity.
*please include the results from the results that I give it to you
Introduction
In this experiment, the concentration of Zn in metal element and water sample were determined using the method of linear calibration and standard addition method through atomic absorption spectroscopic. In instrumental technique, the proportionalities need to be practically established in calibration procedure. In a typical simple calibration, a range of standard is prepared containing varying amounts of the analyte. The standard additions method was used to determine the present of Zn which more effective to reduce the problems of matrix effects. The standard addition technique involves adding known amounts of standard to one or more aliquots of the processed sample solution, compensating for a sample constituent that enhances or depresses the analyte signal. For multi-point, the absorbance of each solution is determined and then plotted on the vertical axis of a graph, with the concentrations of the known standards plotted on the horizontal axis. A linear regression program may be used to obtain the intercept concentration: y= mx + c
Where m = slope c = y intercept

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