Page 218 - Praxair - Specialty Gases and Equipment Reference Guide

Laboratories

Analytical Instrumentation

Praxair’s Gas Grade Recommendations
Analytical Method Instrument Page Analytical Range “Type of Analysis
Detector Gases Number < 100 ppm > 100 ppm Impurity Considerations”
Others
NMR LHe B •84 Liquid Liquid Analysis of Molecular Structure
(Nuclear Magnetic Resonance) LN 2 B •85 Liquid Liquid
MS Air B •24 AI 0.0UZ AI 0.0UZ All Compounds via Various
(Mass Spectrometry) Ar B •26 AR 5.5TG/ AR 5.0UH/ Ionization Sources
AR 5.0UH AR 4.8IC
LAr B •82 AR 5.0 AR 5.0/
AR 4.8IC
He B •53 HE 5.5TG HE 5.0UH
H 2 B •54 HY 6.0RS HY 5.0UH
N 2 B •65 NI 5.5TG/ NI 5.0UH
NI 5.0UH
LN 2 B •85 NI 5.0 NI 5.0/
NI 4.8
NH 3 in He C •99 Certified Certified
Standard Standard
Nuclear Counter 5% CH 4 in Ar D •218 IG P5 IG P5 Radioactivity
10% CH 4 in Ar D •218 IG P10 IG P10 Laboratories
D •218 IG NC4 IG NC4
1.3% n-C 4 H 10
in He
D •218 IG NC5 IG NC5
0.95% i-C 4 H 10
in He
Hydrometer Air B •24 AI 0.0UZ AI 0.0Z Moisture in All Gases
N 2 B •65 NI 6.0RS NI 5.0UH
Paramagnetic Analyzer N 2 B •65 N/A NI 5.0UH Oxygen in All Gases
O 2 in N 2 C •127 Certified Certified
Standard Standard
Combustion Analyzer Ar B •26 AR 5.0UH AR 5.0UH Elemental Analysis – Carbon,
He B •53 HE 5.0UH HE 5.0UH Nitrogen, Sulfur
N 2 B •65 NI 5.0UH NI 5.0UH
O 2 B •70 OX 5.0RS OX 5.0RS

Gas Grade Legend Please refer to designated page numbers for available
CE – Continuous Emissions Monitoring cylinder styles, contents, and other information.
ICP – Inductively Coupled Plasma Please refer to the Instrumentation Mixture Summary
RS – Research/Chromatographic on page D •218 for additional information regarding mixtures.
TG – Trace Analytical Please refer to the Regulator Reference Guide on page E •241
UH – Ultra High Purity for help in selecting the appropriate cylinder regulator.
UZ – Ultra Zero
VC – Volatile Organic Compound Free
Z – Zero

1-877-PRAXAIR www.praxairdirect.com D•217