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2008年10月28日 · My solvent is water. I am doing a splitless injection with purge flow to vent at 0.01 min. I believe that if I can inject the headspace gas faster onto the colum I might be able to get these peaks resolved. My question is how can I inject the headspace sample faster onto GC? My vial parameters are Fill mode: Flow to pressure Fill pressure: 15

2012年6月1日 · As the oven temperature increases, the amount of gas entering the headspace from the sample increases, increasing the pressure in the vial and delivering more analyte to the GC. This increases the sensitivity. When you pick an oven temperature, consider the following: • Over-pressurization of the headspace vial could be dangerous.

2008年2月22日 · Headspace pros: the water in the sample will not damage the column as much. Solid muck and dissolved solids in the samples will not damage the hardware. Headspace cons: peak area for a given concentration of analyte depends on what else is in the sample, so you have to run a calibration for every matrix - a sample with a lot of dissolved solids ...

2008年1月5日 · Inlet flow line from EPC controller cut approx 1inch from the inlet weldment, gas flow routed into headspace, through valve/loop system and then through an 80cm transfer line to a zero dead volume connection just before the gas line enters the inlet.

2012年3月23日 · Subscribe to our eNewsletter with daily, weekly or monthly updates: Food & Beverage, Environmental, (Bio)Pharmaceutical, Bioclinical, Liquid Chromatography, Gas Chromatography and Mass Spectrometry. Follow us on Twitter: @Sep_Science; Follow us on Linkedin: Separation Science

2006年9月7日 · We're transferring a method for residual solvents using an Agilent 6890 with headspace sampler. As the run progresses we are seeing a drop in the areas of our standard solutions and internal std. My colleague thinks this may be due to the increasing time each vial spends in the oven (time increases as GC oven cools down, knock-on effect for ...

2011年10月26日 · Any ideas as to what could cause a static headspace injection to produce peak areas roughly 60-80% higher than the other injections in the series? For example, in a 6-injection series of a std. solution containing 12 residual solvents, 5 out of the 6 injections will be right on top of each other with %RSDs <5 for all analytes.

2012年1月8日 · Subscribe to our eNewsletter with daily, weekly or monthly updates: Food & Beverage, Environmental, (Bio)Pharmaceutical, Bioclinical, Liquid Chromatography, Gas Chromatography and Mass Spectrometry. Follow us on Twitter: @Sep_Science; Follow us on Linkedin: Separation Science

2008年10月28日 · Subscribe to our eNewsletter with daily, weekly or monthly updates: Food & Beverage, Environmental, (Bio)Pharmaceutical, Bioclinical, Liquid Chromatography, Gas Chromatography and Mass Spectrometry. Follow us on Twitter: @Sep_Science; Follow us on Linkedin: Separation Science