Table 5
Heavy metal contents of solar salt, Seok-jang and soy sauce (unit: ppm)

	Ni	Cr	Pb	Cu	As	Zn	Cd
Solar salt	0.010±0.0021)c2)	0.020±0.003c	ND3)	0.004±0.001b	ND	0.002±0.001b	ND
Seok-jang	0.030±0.005b	3.800±0.28a	0.010±0.001	0.005±0.001b	ND	0.002±0.001b	ND
Soy sauce	1.833±0.19a	0.967±0.05b	0.033±0.008	0.533±0.084a	ND	5.633±0.670a	ND

Results are shown as mean±SD.
^a-cMeans with different small letters in the same column are significantly different (p<0.05) by Duncan's multiple range test.
ND, Not detected.