ATOMIC EMISSION SPECTROMETRY Chap 10 Sections: Sections: 10A 10A 10A-1 10A-1 10A-3 (skim) 10A-3 (skim) 10A-4 10A-4

INDUCTIVELY COUPLE PLASMA (ICP) Plasma ≡ a high temperature, electrically conducting “soup” of cations and electrons Ionization energy of Ar is 15.8 eV (1.3 x 10 5 cm -1 ) In plasma, analyte atoms are ionized by collisions with Ar + Temperatures up to 10,000 K possible

ICP Torch Head Fig B B Top view ~ 2.5 cm Ar flow 5 – 20 L/min

Inductively Coupled Argon Plasma ∼2.5 cm B B rf generator I Tesla coil Ar

Temperature Profile of a Plasma Fig. 10-4

Typical Nebulizer for Sample Injection Analogous to Fig Analogous to Fig Ar

Piezoelectric crystal Drain Sample inlet Aerosol to torch Ultrasonic Nebulizer

Fig 10-8 Direct reading ICP emission spectrometer

Fig Detection limits of elements by ICP

Fig Internal calibration curves nm) with ICP

Mon 5 Feb 0700 Meet in quant lab for Vreeland & AA demo