Table 1:

Accuracy, precision, reliability and linearity values for each type of tobacco-specific nitrosamine analysed in the Afzal samples

Value	NAB	NAT	NNK	NNN
Average in μg/g	10.480	83.400	23.270	89.690
SD	1.110	0.650	0.280	0.970
RSD in %	10.550	0.780	1.220	1.080
Accuracy in %	104.840	92.670	93.090	99.660
R-value	0.986	0.986	0.971	0.994
LOD in ppb	3.320	1.960	0.850	2.910
LOQ in ppb	11.060	6.530	2.850	9.710

NAB = N-nitrosoanabasine; NAT = N-nitrosoanatabine; NNK = 4-(N-nitrosomethylamino)-1-(3-pyridyl)-1-butanone; NNN = N-nitrosonornicotine; SD = standard deviation; RSD = relative standard deviation; LOD = limit of detection; ppb = parts per billion; LOQ = limit of quantification.