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Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

Air Quality Criteria for Lead Volume II of II - (NEPIS)(EPA) - US ...

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AX7-17<br />

Tools Species Lability<br />

Species Particle<br />

Size<br />

Table AX7-1.1.3. Characteristics <strong>for</strong> Direct Speciation Techniques<br />

Species Valance<br />

State<br />

Species Bonding<br />

Species<br />

Composition<br />

Species<br />

Abundance<br />

XRD No No No No No# No No No 3-4 vol% Bulk 1 $<br />

EMPA Yes Yes Yes+ No Yes Yes? B-U No*** 50 ppm 0.5-1 µm 2 $$<br />

SIMS No Yes No No Yes* Yes** Li-U Yes 1 ppb 10 µm 4 $$$<br />

XPS No No Yes Yes Yes* Yes** H-U No wt.% 100 µm 2 $$<br />

XAS No No Yes Yes Yes* Yes** He-U No ppb 2 µm 5 $$$$<br />

PIXIE No No No No Yes Yes** B-U No 10 ppm 4 µm 4 $$$$<br />

* Technique requires each element be tuned and standardized, requiring unreasonable time limits.<br />

** Techniques designed and tested only on simple systems. Multiple species require lengthy analytical times and data reduction.<br />

*** Limited when combined with ICP/MS/LA.<br />

# Identifies crystalline compounds and stoichiometric compositions only.<br />

? Technique has limitations based on particle counting statistics.<br />

+ Valance determined by charge balance <strong>of</strong> complete analyses.<br />

Element<br />

Specificity<br />

Isotopic<br />

Character<br />

Element<br />

Sensitivity<br />

Resolution<br />

Availability<br />

Cost

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