Friday, July 10, 2015

Analysis of metals at sub ppb levels by HG-GC-PID


ABSTRACT SYMPOSIUM NAME: Advances in Analytical Separations
ABSTRACT SYMPOSIUM PROGRAM AREA NAME: [ANYL] Division of Analytical Chemistry
CONTROL ID: 2213879
PRESENTATION TYPE: Oral
TITLE: Analysis of metals at sub ppb levels by HG-GC-PID
Pacific Blrm F - Renaissance Boston Waterfront
Publication Number: 164
*John Driscoll, pidguy@aol.com, *Jennifer Maclachlan, pidgirl@gmail.com. PID Analyzers, LLC, Sandwich, Massachusetts, United Statesm-2:25pm
AUTHORS (FIRST NAME, LAST NAME): John N. Driscoll2Jennifer L. Maclachlan1
INSTITUTIONS (ALL): 1. PID Analyzers, LLC, Centerville, MA, United States.
2. PID Analyzers, LLC, Sandwich, MA, United States. 
ABSTRACT BODY: 
Abstract: 
Hydride generation (HG), is a relatively simple method that has been used to clean up and concentrate samples for more than 40 years. It was used primarily in combination with atomic absorption (AAS) spectroscopy & a liquid nitrogen trap to measure down to low ppb levels. This instrumentation has been replaced by more sensitive and expensive equipment like graphite furnace AAS or ICP/MS for the detection of sub ppb levels of metals.
A number of papers have been published using gas chromatography- photoionization (GC/PID). This is a more sensitive method than AAS but a liquid nitrogen trap was still required. We have found recently that a capillary GC with an improved PID can replace the liquid nitrogen trap yet still provide sub ppb detection limits. The metals that we have been working with include: As, Pb, Cd, Se, Te, Sn, Fe…
We have also developed a new static headspace method that simplifies the normal hydride generator, reduces the analysis time and provides a modest improvement in sensitivity with a very wide operating range. These new developments will be described in this presentation.

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