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Overview of cleaning methods for residual contamination of headspace injectors: The problem of residual contamination of the automatic headspace sampler can be solved by steam cleaning. At present, many headspace samplers adopt the transmission line method, 1.5ml crimp vials which is also a very common form. Agilent, PE and many other instruments in the country also adopt the same method. It is generally believed that long transmission lines are prone to residual contamination problems due to problems such as large surface area and inertness of the inner wall, especially those having a relatively high polarity and a high boiling point. Cleaning in daily use is more important.
The following is a specific case to introduce a simple steam cleaning method. The column analyzes the volatile components in the aqueous solution. In the blank test (headspace pure water), more impurity peaks were found. First, measure the temperature of the program temperature (do not use headspace injection, directly start the chromatographic data acquisition. Determine the fault location in the GC or HS), and find that the program temperature blank is normal, there is no peak interference. Thereby determining the problem in the HS section. In the manual, there is a standard cleaning procedure, but the operation is not easy. Observe the principle of standard cleaning by raising the temperature of each part and purging the line with water vapor. Because the programming of the headspace sampler is cumbersome, a workaround is adopted. Without changing the headspace sampling procedure, 1 ml of pure water is sealed in the headspace bottle to increase the temperature of the furnace to 120 degrees, while increasing the transmission line and The six-way valve has a temperature of 150 degrees and is continuously injected multiple times. At the same time, the split ratio of the GC end is increased (in fact, the column can be removed, the effect will be better) to avoid contamination of the column. After the treatment is completed, return to the normal analysis state, and re-inject the pure water into the headspace. It can be seen that the impurity peak is significantly reduced and the fault is removed. Summary: Simple cleaning of the headspace sampler 1.5ml crimp vials residue using high temperature water vapor.
This is the end of the introduction of How to clean the residual pollutants in the headspace sampler? I hope it can help you.
