-
- Posts: 6
- Joined: Tue Jan 16, 2018 4:19 pm
in my lab, i use liquid nitrogen to cool down the oven temperature to -20(which is initial temperature) to analyze voc soil sample by GC-MS. The question is i ran blank spike (200ppb), then three rinse, then blank of batch, then samples. every time, the blank is clean, the first two samples after blank always have vinyl chloride. When i reprpe and reanalyze, the vinyl chloride is gone. The reason i reanalyze is because the client is not happy with that. However, the blank is clean which my source is clean, i do not understand why there is vinyl chloride and the management forced me to reanalyze.
thank you all
rebecca