Commercial Propane and Butane. Gas Chromatography Analysis

This document establishes the standardized procedure for the quantitative analysis of propane and butane intended for commercial use through gas chromatography. The methodology provides a validated framework to determine the composition of these hydrocarbon mixtures, ensuring accurate identification of constituent components. It outlines the necessary instrumentation requirements, including chromatographic columns and detectors suitable for volatile organic compounds. The text specifies sample preparation techniques and operational parameters such as carrier gas flow rates and temperature programming profiles essential for achieving reliable separation. Detailed instructions are provided for the interpretation of chromatograms and the calculation of purity percentages for both propane and butane fractions. This approach supports the verification of product quality against specified limits, facilitating consistent evaluation across different testing laboratories. The guidance ensures that analytical results are reproducible and comparable, contributing to uniformity in commercial transactions involving these fuel gases.