Residual solvent oil gas chromatograph

Residual solvent oil gas chromatograph

Gas chromatography is used to detect residual solvent oil in edible oil Introduction: Solvent No. 6 is mainly composed of n-hexane and heptane, and also contains small amounts of harmful substances such as benzene and toluene. It is a solvent with anesthetic properties for breathing. Due to the presence of harmful substances such as benzene, aromatic hydrocarbons, and sulfur in the No. 6 extraction solvent, it can be harmful to the human system and organs, leading to functional disorders and excessive solvent residue in edible oil. Long term consumption can cause paralysis of human sperm and numbness. According to the GB/T 5009.37-2003 Hygienic Standard for Edible Vegetable Oils, Shandong Qiancheng Analytical Instrument Co., Ltd. provides a solution for analyzing residual solvent No. 6 in edible oils based on customer needs. 2. Experimental equipment: 1 1 set of gas chromatograph (with programmed heating) 2 1 hydrogen generator 3 1 air generator 4 1 chromatography workstation 5 1 capillary chromatography column 6 One electronic balance (0.1mg) 7 Several headspace injection bottles and syringes 8 1 oven or headspace sampler (optional) 3. Experimental conditions: 1. Chromatography column: SE-54 30m * 0.32mm * 0.5um 2. Detector: hydrogen flame ionization detector 3. Column temperature: programmed temperature. 4. Vaporization chamber temperature: 140 ℃ 5. Carrier gas (N3): 30 mL/min 6. Hydrogen gas: 50 mL/min 7. Air: 500 mL/min. Steps: 1 Take the oil with a low solvent content from the test tube No. 6 on the gas chromatograph as the base oil for curve preparation (or edible oil or oil extracted by removing most of the residual solvents through an open process at 70 ℃), weigh 25g and put them into 6 headspace bottles, seal them tightly. Inject the standard solution of solvent No. 6 through a stopper to prepare 6 different concentrations of standard samples. Place the sample in a 50 ℃ oven, equilibrate for 30 minutes, extract the gas from the liquid and inject it into the chromatography. After deducting the blank value from each response value, draw a standard curve (multiple chromatographic peaks are calculated using normalization method). 2. Weigh 25g of edible oil sample, seal it tightly, and heat it in a 50 ℃ constant temperature box for 30 minutes. After taking it out, use a syringe or injector to draw 0.10mL to 0.15mL of liquid gas (compared to the standard curve injection volume *) and inject it into gas chromatography. Record the peak height or peak area of single or multiple components (measured by normalization method), compare it with the standard curve, and calculate the content of solvent No. 6 in the liquid gas. Residual solvent oil gas chromatograph

Residual solvent oil gas chromatograph