Table 2.

The mean contents of five heavy metals in coix seeds from 12 cities in Guizhou Province.

Region	Cd (mg/kg)	Pb (mg/kg)	As (mg/kg)	Cr (mg/kg)
Panzhou	0.0014 b ± 0.0004	0.0050 c ± 0.0000	0.0059 b ± 0.0016	0.0694 a ± 0.0694
Anlong	0.0018 b ± 0.0019	0.0066 bc ± 0.0036	0.0094 b ± 0.0063	0.0889 a ± 0.0694
Yilong	0.0201 a ± 0.0324	0.0090 bc ± 0.0035	0.1463 a ± 0.2103	0.1131 a ± 0.0940
Zhenfeng	0.0011 b ± 0.0007	0.0095 bc ± 0.0071	0.0094 b ± 0.0047	0.0709 a ± 0.0587
Xingreng	0.0017 b ± 0.0041	0.0062 bc ± 0.0048	0.0107 b ± 0.0126	0.1083 a ± 0.2101
Xingyi	0.0011 b ± 0.0004	0.0067 bc ± 0.0029	0.0053 b ± 0.0021	0.0386 a ± 0.0191
Guanling	0.0005 b ± 0.0000	0.0050 c ± 0.0000	0.0028 b ± 0.0000	0.0435 a ± 0.0000
Puding	0.0025 b ± 0.0000	0.0160 b ± 0.0000	0.0100 b ± 0.0000	0.3560 a ± 0.0000
Zhenan	0.0013 b ± 0.0000	0.0520 a ± 0.0000	0.0219 b ± 0.0000	0.3520 a ± 0.0000
Ziyun	0.0031 b ± 0.0012	0.0078 bc ± 0.0048	0.0247 b ± 0.0256	0.3373 a ± 0.0647
Qinlong	0.0022 b ± 0.0006	0.0068 bc ± 0.0036	0.0101 b ± 0.0049	0.0687 a ± 0.0496
Puan	0.0015 b ± 0.0006	0.0050 c ± 0.0000	0.0073 b ± 0.0018	0.2158 a ± 0.1870

Key: Mean concentrations of each heavy metal in coix seed collected from different coix seed producing regions with different letters are significantly different (p < 0.05).