Useful Piezoelectric Sensor to Detect False Liquor in Samples with Different Degrees of Adulteration

Table 1

Results of for four independent tests (average ± SD). Each test contains one hundred measures.

Methanol (%)	Test 1 (Hz)		Test 2 (Hz)		Test 3 (Hz)		Test 4 (Hz)
	Average	SD	Average	SD	Average	SD	Average	SD
0%	1374.6	27.87	1462.3	31.71	1364.6	29.51	1260.9	26.56
10%	1273.0	30.60	1368.7	33.95	1284.8	20.82	1187.3	18.06
25%	1120.7	15.72	1228.3	32.55	1165.1	104.91	1076.9	15.96
35%	1019.1	33.00	1134.8	24.98	1085.3	54.89	1003.3	34.06
50%	866.7	69.61	994.4	40.35	965.7	19.91	892.9	21.23
55%	815.9	12.94	947.6	21.22	925.8	15.86	856.1	19.26
65%	714.3	20.50	854.0	18.65	846.0	46.25	782.4	16.47
75%	612.8	10.10	760.4	14.45	766.2	21.06	708.8	41.42