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For the analysis of Lauryl Alcohol Ethoxylate using Gas Chromatography (GC), the selection of a suitable GC column depends on the specific ethoxylation level and the volatility of the compound. In general, Lauryl Alcohol Ethoxylates are non-volatile or semi-volatile, so derivatization might be necessary before GC analysis. Here are some column options for analysis after derivatization (acetylation):
1. Non-polar columns (like DB-1, HP-1, or RTX-1):These are made of 100% dimethylpolysiloxane. Suitable for analyzing relatively non-polar, derivatized alcohol ethoxylates. Common dimensions: 30 m length, 0.25 mm ID, 0.25 µm film thickness.
2. Mid-polarity columns (like DB-5, HP-5, or RTX-5): These are 5% phenyl, 95% dimethylpolysiloxane. They offer slightly better separation of ethoxylates with varying chain lengths. Common dimensions: 30 m length, 0.25 mm ID, 0.25 µm film thickness.
3. Polar columns (like DB-WAX or HP-FFAP): These are polyethylene glycol (PEG) columns. They are more suited for polar compounds, but Lauryl Alcohol Ethoxylates may still need derivatization. The DB-5 or HP-5 column is often preferred for surfactants like ethoxylates due to its moderate polarity, providing good separation of ethoxylation products.
It's essential to consider the specific range of ethoxylation (number of ethylene oxide units) to optimize the method further. Additionally, derivatization can help in improving volatility and peak shape.
References
edit1. Surfactant Analysis: Methods and Applications published by CRC Press 2. Supelco (Sigma - Aldrich)
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