Table 3.

Heavy metal contents of different parts and layers of leeks (µg/g)

Sample	As µg g−1	Ba	Cd	Co	Cr	Mo	Ni	Pb	Se
Root of leek	10.10 ± 2.01 b	2.45 ± 0.587 a	0.089 ± 0.004 b	0.304 ± 0.037	0.193 ± 0.021 b	0.163 ± 0.018 a	0.422 ± 0.042 ab	0.667 ± 0.054 a	0.726 ± 0.052 a
Onion part of leek	10.46 ± 1.84 b	1.46 ± 0.148 b	0.113 ± 0.011 a	0.380 ± 0.091	0.123 ± 0.017 c	0.125 ± 0.004 b	0.469 ± 0.075 a	0.531 ± 0.057 b	0.149 ± 0.020 c
Leaf top of leek	13.81 ± 0.673 ab	1.43 ± 0.226 b	0.056 ± 0.014 c	0.390 ± 0.063	0.107 ± 0.007 c	0.109 ± 0.004 b	0.362 ± 0.022 b	0.193 ± 0.006 c	0.136 ± 0.001 c
Leaf of leek	16.23 ± 2.86 a	1.10 ± 0.044 b	0.013 ± 0.001 d	0.298 ± 0.017	0.243 ± 0.037 a	0.170 ± 0.010 a	0.380 ± 0.033 ab	0.167 ± 0.017 c	0.481 ± 0.043 b
Sample	As	Ba	Cd	Co	Cr	Mo	Ni	Pb	Se
1. Layer of leek	3.31 ± 0.841 e	1.39 ± 0.228 a	0.091 ± 0.013 d	0.381 ± 0.072 a	0.195 ± 0.026 a	0.091 ± 0.016 b	0.367 ± 0.108 ab	0.646 ± 0.044 b	0.258 ± 0.042 d
2. Layer of leek	8.84 ± 1.56 cd	0.674 ± 0.191 bc	0.129 ± 0.009 b	0.218 ± 0.033 b	0.219 ± 0.032 a	0.107 ± 0.044 d	0.283 ± 0.039 bc	0.249 ± 0.015 d	0.247 ± 0.015 d
3. Layer of leek	6.70 ± 1.19 d	0.698 ± 0.083 bc	0.089 ± 0.005 de	0.277 ± 0.034 b	0.124 ± 0.015 bc	0.127 ± 0.012 a	0.322 ± 0.082 abc	0.351 ± 0.095 c	0.617 ± 0.018 a
4. Layer of leek	10.22 ± 1.33 bc	0.600 ± 0.052 bc	0.075 ± 0.002 ef	0.260 ± 0.060 b	0.122 ± 0.025 bc	0.114 ± 0.009 a	0.247 ± 0.026 c	0.266 ± 0.023 d	0.305 ± 0.027 c
5. Layer of leek	12.89 ± 2.49 ab	0.725 ± 0.106 b	0.167 ± 0.016 a	0.276 ± 0.049 b	0.158 ± 0.009 b	0.074 ± 0.007 b	0.232 ± 0.014 c	0.844 ± 0.048 a	0.258 ± 0.009 d
6. Layer of leek	8.76 ± 0.652 cd	0.683 ± 0.097 bc	0.110 ± 0.005 c	0.412 ± 0.015 a	0.107 ± 0.016 c	0.056 ± 0.009 c	0.407 ± 0.080 a	0.187 ± 0.018 d	0.518 ± 0.006 b
7. Layer of leek	14.36 ± 2.72 a	0.478 ± 0.057 c	0.060 ± 0.005 f	0.432 ± 0.048 a	0.158 ± 0.002 b	0.043 ± 0.008 c	0.359 ± 0.016 ab	0.356 ± 0.033 c	0.505 ± 0.029 b

p < 0.01