Table 1. The equations and the correlation coefficients of aldehydes.

Matrices	Calibration curve	Limit of detection (ng/g)	Calibration range (ng/g)	Linearity
Acetaldehyde
Rice porridge	Y = 0.0031X − 0.7071	51.8	50-10,000	0.0976
Orange juice	Y = 0.0029X + 0.2312	19.9	50-10,000	0.9935
Corn oil	Y = 0.0022X + 0.2199	66.8	50-10,000	0.9988
Peanut butter	Y = 0.0024X + 2.0043	175.03	250-10,000	0.9977
Beef	Y = 0.0025X + 0.426	25.08	100-5,000	0.9982
Milk	Y = 0.0023X − 0.0535	5.74	50-10,000	0.9993
20% EtOH	Y = 0.0021X + 0.2879	12.57	50-10,000	0.9973
Formaldehyde
Rice porridge	Y = 0.0038X − 0.2778	38.0	50-10,000	0.9504
Orange juice	Y = 0.0029X − 0.0333	17.2	50-10,000	0.9957
Corn oil	Y = 0.0073X − 0.7389	120.9	50-10,000	0.949
Peanut butter	Y = 0.0066X + 0.1529	15.05	50-10,000	0.9921
Beef	Y = 0.0033X + 0.1611	7.80	5-700	0.9985
Milk	Y = 0.0056X + 0.0595	12.20	5-1,000	0.9974
20% EtOH	Y = 0.0027X + 0.0056	11.00	10-1,000	0.998