20.07.2013 Views

Is My Drywall Chinese? - HB Litigation Conferences

Is My Drywall Chinese? - HB Litigation Conferences

Is My Drywall Chinese? - HB Litigation Conferences

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Analysis Methods—<br />

Electrochemical and Optical<br />

• Jerome sensor—gold foil, sensitive<br />

• Electrochemical—diffusive Electrochemical diffusive, reaction‐based<br />

reaction‐based,<br />

mainly used for emergency notification—high<br />

detection limits (high ppbv to ppmv)<br />

• FTIR—open path/closed path (cell). H2S is poor<br />

IR absorber, so relatively insensitive<br />

• Cavity ring‐down spectroscopy—sensitive,<br />

specific, ifi bbut texpensive i<br />

• UV‐fluorescence—used for continuous ambient<br />

monitoring, not suitable for portable or<br />

laboratory application<br />

On‐site Analysis—<br />

Mobile Laboratory<br />

• Rapid analysis<br />

• No losses<br />

• Strengths of gas chromatography with element‐<br />

specific detector<br />

• More sensitive than laboratory analysis (uses<br />

cryo—0.1 ppbv)<br />

• EExpensive i overall, ll bbut ton per‐sample l bbasis i iis<br />

competitive<br />

• Best data quality<br />

6/23/2009<br />

6

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!