Packaging solvent residue chromatographic analyzer

In the past 20 years, the packaging industry has developed rapidly, and composite flexible packaging has been widely used in various packaging, especially food packaging, due to its exquisite printing, good barrier properties, convenient use, and packaging automation. We know that printed packaging materials have varying degrees of odor, depending on the printing method or ink composition used. How to evaluate these odors? The first thing to emphasize here is not what kind of odor it emits, but the impact of the packaging material formed after printing on the contents of the packaging. With the development of the economy and the improvement of living standards, people are paying more and more attention to food hygiene and safety. Packaging materials that come into direct contact with food not only protect the product, but may also contaminate it Our company uses headspace sampling method to detect residual organic solvents in packaging materials.

1Packaging solvent residue chromatographic analyzerFast analysis speed, no need to use organic solvents for extraction during the analysis process, low harm to analysts and the environment, easy operation, minimal column pollution, and simple spectra. It is an analytical method that meets the requirements of "green analytical chemistry" and is widely used in environmental monitoring, food and health epidemic prevention, traditional Chinese medicine component analysis, organic solvent residue detection, and pharmacokinetics.

IIWorking principle and advantages:

Automatically heat the sample according to the set value after startup; Needle insertion; Charge pressure balance; Sampling; Fill the sample into the quantitative tube; Six way valve switching injection; Start the workstation to start sampling and recording work Analysis is to determine the content of these components in the original sample by analyzing the gas composition above the sample matrix Obviously, this is an indirect analysis method, and its basic theoretical basis is that there exists a distribution equilibrium between the gas phase and the condensed phase (liquid phase and solid phase) under certain conditions So, the composition of the gas phase can reflect the composition of the condensed phase We can regard headspace analysis as a gas-phase extraction method, which uses gas as a "solvent" to extract volatile components from samples. Therefore, headspace analysis is an ideal sample purification method Traditional liquid-liquid extraction and SPE involve dissolving the sample in a liquid, inevitably leading to some co extracted substances interfering with the analysis Moreover, the purity of the solvent itself is also an issue, which is particularly important in trace analysis Using gas as a solvent can avoid unnecessary interference, as high-purity gases are easily obtainable and cost-effective, which is also an important reason why headspace GC is widely used
　　Using headspace analysis method, headspace analysis is simple as it only takes the gas phase for analysis, greatly reducing the interference of sample matrix on analysis As a sample processing method for GC analysis, headspace is the most convenient Secondly, headspace analysis has different modes that can be adapted to various samples by optimizing operating parameters Thirdly, the sensitivity of headspace analysis can meet regulatory requirements. After that, combined with the quantitative analysis ability of GC, headspace GC * can perform accurate quantitative analysis

3、 Instrument configuration:

1. GC-7890/9860 gas chromatograph with hydrogen flame detector (with split injection and tail blowing system)

2. HS-9A headspace sampler (automatic acquisition of chromatographic signals)

3. Capillary chromatography column (customized according to user requirements)

4. Nitrogen, hydrogen, and air source gases with a purity of 99.999%

5. Data processing system (computer, printer, chromatography workstation)

4、 Sample processing

1. Crush a certain area of food packaging materials with a shredder.

2. Place the sample into a 20mL headspace sample bottle.

3. Place the sample bottle into the headspace sampler and heat it for injection.

5、 Analysis conditions

1

6、 Results and Discussion

The analysis results are shown in Figures 1 and 2. Figure 1 shows the analysis results of four solvent standard samples, and Figure 2 shows the analysis results of food packaging bags used in a certain food factory.

The qualitative analysis results are as follows:

7、 Application scope of headspace gas chromatography:
(1) Forensic Science: Testing of volatile toxins such as alcohols, aldehydes, and ketones in blood and urine
(2) Traffic Safety: Testing of Blood Alcohol Content for Vehicle Drivers Drinking and Drunk Driving
(3) Brewing industry: determination of low boiling point aroma components in beer
(4) Food industry: detection of residual 6 # solvent in extracted oil
(5) Environmental protection: Determination of volatile halogenated hydrocarbons in surface water and tap water such as rivers, lakes, etc
(6) Pharmaceutical industry: detection of residual solvents in drugs
(7) Material control: detection of residual acetaldehyde in beverage bottles

(8) Coatings and paints: detection of organic volatile compounds such as benzene, toluene, and xylene in coatings and paints

（9）Packaging printing: detection of residual organic solvents in flexible packaging bags