peroxide cleaving in injection port

[phenol guy]

I have a method that I currently do in the lab inwhich I neutralize an acidic organic sample (containing 200ppm H2SO4) using either Naoh or ethanolamine prior to injection. However we would like to test a non- neutralized sample in the plant using an online GC. The dicumylperoxide (300-500ppm) that we want to quantify cleaves in my injection port if the sample is not neutralized. I have lowered the inj. temp with poor results. What are some other options? Do you think it is possible?

[Joerg Niebel]

I have a method that I currently do in the lab inwhich I neutralize an acidic organic sample (containing 200ppm H2SO4) using either Naoh or ethanolamine prior to injection. However we would like to test a non- neutralized sample in the plant using an online GC. The dicumylperoxide (300-500ppm) that we want to quantify cleaves in my injection port if the sample is not neutralized. I have lowered the inj. temp with poor results. What are some other options? Do you think it is possible?

Hi,
have you tried injecting your analyte solution at high split ratio to minimize residence time of your analyte in the injector port? This may improve the quality, as some thermolabile compounds may need to see the glass barrel to fall apart.
Regards
Joerg

[phenol guy]

I'm using 100:1 split and 0.3uL uL injection volume. I looked at some old data where I tried this in 2004. At the time I had good results. The only difference I can see in the methods between now and then is now I use Hydrogen as a carrier instead of Helium. Do you htink this would make the difference?