Calibration curves are not required to be forced through the origins. The reference in the regulation is a suggested method.(7/1/94)
This question and answer is posted at http://www.epa.gov/otaq/regs/fuels/rfg/qa/420r03009.pdf. The original was posted in the Q&A posted on 7/1/94 which can found at http://www.epa.gov/otaq/rfg_qa.htm" See Question ID 3857 for RFG (Taken from the first question on http://www.epa.gov/otaq/regs/fuels/rfg/qa/420r03009.pdf)
In the GC-MS test for aromatics, why must the calibration curves be forced through the origin? All mass spectrometers will show some noise at a zero concentration level.
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