Table 1 Heavy Metal Concentrations in Environmental Samples near a Multi-metals Sulphide Mine in Guangdong, China

N (excluding water source)

1

1

1

6

pH

   Water source

7.10 (Huangzhuping) 7.12 (Guizhu) ^c

6.0-9.0

   Irrigation water

4.92

7.75

7.76

7.02 - 7.35

5.50-8.50

   Well water

4.77

7.06

6.88

7.04 - 7.56

6.5-8.5

Cadmium

   Water source (mg/L,×10^-3)

0.09 (Huangzhuping) 0.10 (Guizhu) ^c

5

   Irrigation water (mg/L,×10^-3)

8.31

4.25

0.66

<0.001

5

   Well water (mg/L, ×10^-3)

8.88

0.13

0.07

<0.001

5

   Soil (mg/kg)

0.528

0.422

0.043

0.032 - 0.18

0.30

   Rice (mg/kg)

0.47

0.36

0.02

0.006 - 0.075

0.20

   Avena nula (mg/kg)

0.13

0.06

0.01

0.004 - 0.060

0.20

Lead

   Water source (mg/L)

0.01 (Huangzhuping) 0.01 (Guizhu) ^c

0.010

   Irrigation water (mg/L)

0.045

0.035

0.013

<0.01

0.200

   Well water (mg/L)

0.012

0.017

0.016

<0.01 - 0.02

0.01

   Soil (mg/kg)

600

770

68

7.13 - 19.93

300

   Rice (mg/kg)

830

520

280

<0.05

300

   Avena nula (mg/kg)

820

1690

1050

0.030 - 0.145

300

Copper

   Water source (mg/L)

0.01 (Huangzhuping) 0.01 (Guizhu) ^c

1.000

   Irrigation water (mg/L)

0.631

0.020

0.020

<0.01

0.500

   Well water (mg/L)

1.570

0.020

0.045

<0.01

1.00

   Soil (mg/kg)

1261

147

20

2.85 - 8.19

100

   Rice (mg/kg)

5.38

3.08

2.03

0.43 - 0.69

10

   Avena nula (mg/kg)

1.31

0.82

0.42

0.23 - 1.09

- ^d

Zinc

   Water source (mg/L)

0.01 (Huangzhuping) 0.01 (Guizhu) ^c

1.000

   Irrigation water (mg/L)

25.200

0.048

0.005

<0.01 - 0.84

2.00

   Well water (mg/L)

4.89

0.024

0.011

<0.01 - 0.49

1.00

   Soil (mg/kg)

680

227

68

2.85 - 8.19

250

   Rice (mg/kg)

29.40

20.70

13.80

7.50 - 10.90

50

   Avena nula (mg/kg)

20.80

5.12

3.73

2.89 - 7.94

- ^d