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Dania Alvarez Fonseca

Analysis and Instrument Description

Example Analyses

Gas Chromatography

Varian CP 3800 GC
FID and TSD detectors

Analysis of most organic compounds and selective monitoring of nitrogen and phosphorous compounds.

Simulated Distillation Gas Chromatography

HP 5890 GC Series II
Column is a Restek Sim.Dist. Column

Simulated Distillation is used to explore boiling point distributions in complex mixtures, usually fuel related.

S and P Selective Detection (Gas Chromatograhpy)

HP 5890 Series II GC
PFPD detector

PFPD detector is used to selective monitor sulfur, and phosphorus concentrations in complex mixtures.

Separation of Chiral Components (Gas Chromatography)

HP5890 Series II
BETA-DX Capillary Column

This instrument is setup for the separation of specific isomers and compounds generally difficult to resolve with conventional gas chromatographic columns.

Gaseous Samples Analysis by Gas Chromatography

Shimadzu GC-17A
FID and TCD detectors

GC used for analysis of gaseous samples.

High Performance Liquid Chromatography

Waters 600E pump/996 PDA detector

Liquid chromatography can be used to characterize complex mixtures that are not amenable to GC. Detection is afforded by a photodiode array detector.

Gas Chromatography/ Mass Spectrometery featuring Direct Insertion Probe

Shimadzu QP-5000

Compound identifications are provided in this technique by the mass spectrometer. The probe is used to bypass the GC column if necessary.

Pyrolysis-Gas Chromatography/Mass
Spectrometry

HP 5971 GC/MS
CDS Pyroprobe 1000

Py-GC/MS is used to characterize high molecular weight materials. Rapid heating to high temperature 'fractures' the sample for analysis by GC/MS.