8.4 Atomic absorption spectrometry (AAS)

Question 1

1 ppm =

Answer 1

1 mg/kg
1 mg/L
1 microg/g

Question 2

AAS is used to determine…

Answer 2

minuscule concentrations of metal ions in a solution

Question 3

trace element =

Answer 3

element with avg conc of less than 100 ppm

Question 4

use of AAS in agriculture

Answer 4

monitoring chromium, copper, zinc, as nutrient requirements for plant metabolism

Question 5

use of AAS in med

Answer 5

metal constitution of blood

Question 6

AAS process:

Answer 6

(1) use hollow cathode lamp with produces a wavelength of metal you’re measuring

+ burner, contains vaporised ions

(2) emission through sample.. only what allows it to move to a higher excited state

+ monochromator (single wavelength)

(3) shows up on monitor

Question 7

the burner/flame…

Answer 7

converts the aerosol/gas mixture created by the spray chamber and nebuliser, into free, ground state atoms.

air-acetylene and nitrous oxide-acetylene.

Question 8

absorbance is directly proportional to…

Answer 8

concentration

Question 9

absorbance = mass x ppm

Answer 9

A = m x ppm