Gas Chromatography to Detect Harmful Substances in Food Packaging Materials |

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Many paper packaging materials contain various chemicals during production and post-processing, such as fluorescent whitening agents, organic chlorine compounds, plasticizers, curing agents, oil repellents, and fungicides. Long-term exposure to pollutants like benzene can lead to serious health issues, including cancer and disorders of the blood system.

Gas chromatography is a reliable method for detecting harmful substances in food packaging materials. The GC9810A gas chromatograph features high-quality hardware sourced internationally and a stable, intelligent software system designed for long-term use. It supports full EPC control over inlet flow, column carrier gas flow, and detector gas flow. The specially designed ceramic magnifying plate ensures stability even during humid seasons. The imported valve configuration and independent hot oven provide optimal separation performance.

Sample Preparation: Cut the outer-painted surface of the food packaging carton into 6×1 cm paper strips. Take 50 pieces and place them into 50 mL reagent bottles. Add 20 mL of mixed standard solution, soak for 2 hours, then air dry on a wire mesh in the fume hood. Store the samples at 4°C in the refrigerator until testing.

Extraction Process: Take one of the prepared paper samples and cut it into 0.2×0.2 cm pieces. Place them in a 25 mL reagent bottle, seal with Teflon caps, and add 2.00 mL of ethanol. Shake the mixture 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 becomes the test solution.

Gas Chromatographic Method Parameters:

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

This method ensures accurate detection of hazardous substances, helping to ensure the safety of food packaging materials and protect consumer health.

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