AAS methods

Why is an electrothermal atomizer more sensitive compared to a flame atomizer?

i. electrothermal atomizers uses higher temperatures than flame

ii. the atoms have a longer residence time inside the graphite tube compared to the flame

iii. there are inconsistencies in the flame composition and temperature

• i and ii

• i and iii

• ii and iii

• i, ii and iii

What is the best method to analyze aluminium in canned beverage at 1-100μg/L?

• flame AAS

• graphite furnace AAS

• hydride generation AAS

• cold vapor AAS

The oxidation state of the analyte metalloid is important for which atomic absorption method?

• cold vapor

• graphite furnace

• hydride generation

• flame

Which of the following element is commonly analyzed by the hydride generation AAS?

• Se

• Al

• Cr

• Hg

What is the function of argon gas for graphite furnace?

• cool down graphite furnace

• accommodate for high temperature

• provide air atmosphere for atomization

• protect graphite surface from damage

Organically bound mercury can be determined by cold vapor AAS with the addition of what process?

• amalgamation

• acid digestion

• reduction with sodium borohydride

• interaction with stannous chloride