Gas Chromatography to Detect Harmful Substances in Food Packaging Materials |

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Paper packaging materials often contain various chemicals during production and processing, including fluorescent whitening agents, organic chlorine compounds, plasticizers, curing agents, oil repellents, and fungicides. Prolonged exposure to harmful substances like benzene can lead to serious health issues such as cancer and diseases of the blood system.

Gas Chromatography (GC) is a reliable method used for detecting hazardous substances in food packaging materials. The GC9810A gas chromatograph features high-quality, internationally sourced hardware components and advanced, stable software designed for efficient operation and accurate data processing. It supports full EPC control over inlet flow, column carrier gas flow, and detector gas flow. The ceramic-coated magnifying plate ensures stability even in humid conditions. Additionally, it uses a fully imported valve configuration system and an independent hot oven for optimal separation of compounds.

The gas chromatographic method for detecting harmful substances involves several key steps:

Sample Preparation: Cut the outer surface-painted paper into 6×1 cm strips, take 50 pieces, and place them in 50 mL reagent bottles. Add 20 mL of mixed standard solution and let it soak for 2 hours. After removing the samples, dry them on a wire mesh in a fume hood. Store the prepared samples at 4°C in the refrigerator for later use.

Extraction Process: Take one of the prepared paper samples, cut it into 0.2×0.2 cm pieces, and put them into a 25 mL reagent bottle. Seal with Teflon caps. Add 2.00 mL of ethanol and shake in a constant temperature water bath at 50°C for 20 minutes. Perform two extractions, combine the extracts, and dilute to 5 mL using a vortex mixer. This forms the test solution for analysis.

Instrument Parameters:

ColumnDB-1 (30m × 0.25mm × 0.25μm)
Vaporization Chamber250 °C
DetectorFID, 290 °C
Programmed TemperatureInitial temperature: 47°C (hold 3 min), increase to 56°C at 3°C/min (hold 1 min), then to 146°C at 30°C/min (hold 4 min), then to 236°C at 30°C/min (hold 5 min), finally rise to 256°C at 5°C/min.
Injection Volume1.0 μL, split ratio 30:1
Carrier Gas Flow Rate0.5 mL/min

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