1. Scope

1.1 This guide defines purity standards for carbon dioxide to ensure the suitability of liquefied carbon dioxide gas for use in SFE and SFC applications (see Guide E1449 for definitions of terms). This guide defines quantitation, labeling, and statistical standards for impurities in carbon dioxide that are necessary for successful SFE or SFC laboratory work, and it suggests methods of analysis for quantifying these impurities.

1.2 This guide is provided for use by specialty gas suppliers who manufacture carbon dioxide specifically for SFE or SFC applications. SFE or SFC CO 2 products offered with a claim of adherence to this guide will meet certain absolute purity and contaminant detectability requirements matched to the needs of current SFE or SFC techniques. The use of this guide allows different SFE or SFC CO 2 product offerings to be compared on an equal purity basis.

1.3 This guide considers contaminants to be those components that either cause detector signals that interfere with those of the target analytes or physically impede the SFE or SFC experiment.

1.4 The values stated in SI units are to be regarded as the standard.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D2504 Test Method for Noncondensable Gases in C2 and Lighter Hydrocarbon Products by Gas Chromatography

D2820 Test Method for C Through C Hydrocarbons in the Atmosphere by Gas Chromatography

D3670 Guide for Determination of Precision and Bias of Methods of Committee D22

D3686 Practice for Sampling Atmospheres to Collect Organic Compound Vapors (Activated Charcoal Tube Adsorption Method)

D3687 Practice for Analysis of Organic Compound Vapors Collected by the Activated Charcoal Tube Adsorption Method

D4178 Practice for Calibrating Moisture Analyzers

D4532 Test Method for Respirable Dust in Workplace Atmospheres Using Cyclone Samplers

E260 Practice for Packed Column Gas Chromatography

E355 Practice for Gas Chromatography Terms and Relationships

E594 Practice for Testing Flame Ionization Detectors Used in Gas or Supercritical Fluid Chromatography

E697 Practice for Use of Electron-Capture Detectors in Gas Chromatography

E1449 Guide for Supercritical Fluid Chromatography Terms and Relationships

E1510 Practice for Installing Fused Silica Open Tubular Capillary Columns in Gas Chromatographs

Keywords

fluid purity; supercritical carbon dioxide; supercritical fluid chromatography; supercritical fluid extraction ; Carbon dioxide; Purity analysis; SFC (supercritical fluid chromatography); SFE/SFC applications; Supercritical fluid extraction (SFE)

ICS Code

ICS Number Code 71.100.20 (Gases for industrial application)

DOI: 10.1520/E1747-95R00

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