Qualitative Analysis of Cations: Instrumental Techniques

Atomic absorption spectrometry (AAS) is a technique in which atoms (gaseous) absorb electromagnetic radiation at a specific wavelength to produce a measurable signal.

Flame-AAS is used when the concentration of the analyte is high enough, while graphite furnace-AAS is used when the concentration is low.

AAS plays a significant role in the analysis of pharmaceuticals, especially in the analysis of trace elements in bulk drugs and pharmaceuticals.

<p>Highly specific hollow cathode lamps, specific for each element, are used for the emission of electromagnetic radiation in AAS.</p> Signup and view all the answers

<p>The absorption signal in AAS is proportional to the concentration of free absorbing atoms.</p> Signup and view all the answers

<p>A combustion flame or graphite furnace is typically used for AAS while ICP-ES uses argon plasma.</p> Signup and view all the answers

<p>ICP atomic emission spectroscopy has lower detection limits, allowing for the detection of concentrations as low as 1ppb.</p> Signup and view all the answers

<p>Heavy metals are classified based on their relatively high density and atomic mass.</p> Signup and view all the answers

<p>The general limit test for heavy metals is based on the reaction of metallic impurities with hydrogen sulfide in acidic medium to form a brownish color solution.</p> Signup and view all the answers

<p>The permissible limit for lead in drinking water is 0.01mg/L according to the World Health Organization (WHO).</p> Signup and view all the answers