Table 2. Isotope ion abundance ratio of BPA ion species detected in BPA standard spot with DHB.

	Calculated		Measured
	m/z	Isotope abundance ratios (%)	Isotope abundance ratios (%)
[BPA+H]+	209.097	24	25
	210.093	100	100
	211.097	10	8
[BPA+DHB−2H2O+Na]+	349.084	24	21
	350.081	100	100
	351.084	18	16
[BPA+DHB−2H2O+K]+	365.058	24	23
	366.055	100	100
	367.058	20	19