Table 2.

Concentration of metals leached from smoked cigarette material measured after specified period of soaking

	Smoked cigarette material, μg/g
	Al	Ba	Cd	Cr	Cu	Fe	Mn	Ni	Pb	Sr	Ti	Zn
1 day
Mean value	7.83	3.81	–*	0.248	3.96	11.7	25.5	0.313	1.12	9.89	0.646	6.56
Error†	±1.06	±0.41	N/A	±0.025	±0.59	±1.3	±3.2	±0.079	±0.12	±1.29	±0.066	±0.69
Minimum value	7.02	3.56	–*	0.240	3.37	10.9	22.9	0.187	1.08	8.90	0.625	6.20
Maximum value	8.89	3.96	–*	0.257	4.55	12.5	28.2	0.431	1.17	11.1	0.665	6.82
RSD (%)	9.2	4.0	N/A	2.0	11	5.0	7.3	23	2.5	8.4	1.8	3.4
n	9	9	N/A	9	9	9	10	10	9	8	9	11
7 days
Mean value	11.0	6.51	0.149	0.302	2.20	15.2	31.5	0.342	1.35	14.1	0.765	6.58
Error†	±1.3	±0.92	±0.044	±0.045	±0.6	±2.4	±4.4	±0.059	±0.16	±1.6	±0.082	±0.68
Minimum value	9.55	5.54	0.103	0.271	1.54	12.4	26.7	0.276	1.25	10.9	0.722	6.26
Maximum value	11.7	7.41	0.184	0.363	3.17	17.7	35.4	0.409	1.51	16.8	0.817	6.78
RSD (%)	6.5	10	28	11	26	12	9.8	14	6.9	5.2	4.0	2.5
n	8	9	3	10	11	8	9	8	11	9	11	10
34 days
Mean value	8.92	10.4	0.142	0.236	1.22	45.3	40.1	0.298	1.42	23.4	0.755	5.87
Error†	±1.92	±3.0	±0.057	±0.109	±0.46	±9.7	±4.4	±0.223	±0.32	±2.5	±0.099	±0.96
Minimum value	12.1	7.2	0.079	0.128	0.63	30.3	37.7	0.072	1.10	19.3	0.681	5.06
Maximum value	6.52	15.6	0.221	0.460	1.68	59.0	43.5	0.721	2.06	27.3	0.902	6.92
RSD (%)	19	27	39	45	36	19	4.8	74	20	3.5	8.4	13
n	11	9	11	11	10	10	10	9	11	9	10	10

^*Below detection limit.

^†Error represents square root of the sum of the squared relative errors of the mean concentration (1σ) and mass.

RSD, relative standard deviation.