Question

Write the summary on the Analysis of Copper using Flame atomic absorption.

Describe sources of experimental error and how it can impact the data collected ?

discuss what is matrix interference that might occur In this experiment ?

Answer 1

Copper, Cu : it can be determined by Flame-AAS , Upon atomization in a flame, metals absorb at well-defined wavelengths (Copper is analyzed at a wavelength of 324.8 nm ) Flame (AAS) is a convenient and sensitive method for the determination of dissolved metals such as copper.

Solution preparation is first step in which Copper sample is brought in solution form by dissolving it by appropriate acid method.

Standard solution is prepared by serial dilution from stock solution, using these standard calibration curve is prepared (1, 3, 5, 10 ppm standard solution ).Reagent/process blank is must

Than conc. of Cu in unknown solution is determined by repeat analysis.

The presence of other elements in an aqueous sample is expected to interfere with the signal from copper. At higher conc. detector saturates more readily thus deviation from linearity , dilution of unknown may affect accuracy. Memory effect is another source of error.

Matrix effect also leads to error in Cu estimation, if sample is geochemical or heterogeneous in nature, thus giving under or overestimated values. Since standard solution contains only analyte of interest , but unknown sample solution may contain varied ions of molecules in solution. Matrix interferences occur when the physical characteristics (viscosity, burning characteristics, surface tension) of the sample and standard differ considerably.