Determination of Copper by Atomic Absorption Spectrophotometry.docx

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Determination of Copper by Atomic Absorption SpectrophotometryJomar Axel R. Yambao and Patricia Jane I. Young Group #18, 2Chem2, Department of Chemistry, College of Science, University of Santo Tomas, España, Manila1015 Abstract In the experiment, the copper was determined using the PerkinElmer PinAAcle 900F AtomicAbsorption Spectrophotometer. By calibrating the standard solution, the yielded correlation coefficientwas equal to 0.9996, which means it has a good linearity. The copper solution concentration was 2.404ppm and it has an absorbance of 0.1906. Its standard deviation and RSD are 0.0097 and .40%,respectively. Because of these data, the percent purity was obtained, and the value was 44.11%. Differentsources of errors were experience like not diluting to the mark, sometimes the meniscus is below or abovethe marked line. 1. IntroductionAtomic Absorption Spectrometer is an instrument used to analyze metal and trace metal. It canmeasure metals at very low concentrations, typically in parts per million or parts per billion ranges.Moreover, AAS exhibits high selectivity for there is a specific light source for a specific metal to beanalyzed. Atomic Absorption Spectrometer uses hollow cathode lamp as its light source, HLC contains acathode of the analyte element and an anode, filled with a buffer gas usually a noble gas. The radiationsource emits a sharp line spectrum characteristic of the analyte element (Lajunen,1992). The light beamproduced by the light source is then passed through the atomized sample, next to a monochromator, andlastly to a detector (Ulrich, 2003). The sample should be atomized first, the sample would pass through anebulizer that will convert the sample into a mist, then it would be atomized using a high-temperatureflame or furnace. Atomization is the conversion of analyte into a free gaseous atom (Lawley, 2001). Next,it will pass through a monochromator that would select the wavelength necessary for the analysis. Lastly,1 of 7

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