Comparing advantages and disadvantages of using a microwave plasma atomic emissi

Question

Comparing advantages and disadvantages of using a microwave plasma atomic emission spectrometer (MP-AES) instead of a flame or a graphite furnace atomic absorption spectrometer? Which ONE OR MORE of the following statements are FALSE?

A. graphite furnace instruments have higher limits of detection than plasmas

B. flame atomic absorption instruments have higher limits of detection than plasmas

C. plasma instruments can measure a greater number of elements in a single analysis

D. compared to a plasma, low flame temperatures reduce chemical interferences

E. graphite furnaces use the smallest volume of sample per analysis

F. each element requires separate hollow cathode lamps for graphite furnaces

Explanation / Answer

Detection limit GFAAS: 10s-100s ppt, MP-AES: ppb-10s ppb, FAAS: 100s ppb

GFAAS<MP-AES<FAAS

A) False B) True

No. of elements GFAAS: Few ,MP-AES:Many , FAAS:Single

C) True

Chemical interference: GFAAS: Many, MP-AES: Few, FAAS: Some

D) False

Sample volume: GFAAS: <1-2ml, MP-AES: >5ml, FAAS: >5ml

E) True

Sngle element lamps are preffered for GFAAS

F) True

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