Table 3 The concentration of metals (mean ± standard deviation) in mg/kg dry weight in teff samples from 21 sub-districts of three zones

n = 3

235.1 ± 11.6

2116.5 ± 319.6

1649.6 ± 155.7

1135.0 ± 75.4

17.7 ± 0.03

259.1 ± 18.8

175.2 ± 135.2

9.9 ± 0.1

15.6 ± 1.5

16.7 ± 1.2

53.2 ± 2.9

n = 3

196.6 ± 37.2

2226.3 ± 86.54

1742.3 ± 269.7

1202.8 ± 49.0

12.9 ± 9.9

208.7 ± 120.9

199.3 ± 96.0

3.5 ± 5.5

9.6 ± 9.2

10.3 ± 5.0

34.1 ± 14.0

n = 3

289.6 ± 79.2

4850.2 ± 2736.4

2997.8 ± 1177.3

1453.8 ± 119.3

2.1 ± 1.7

337.4 ± 185

164.9 ± 129.4

0.3 ± 0.1

4.5 ± 2.0

9.8 ± 3.3

32.4 ± 9.3

n = 6

272.5 ± 72.1

4416.2 ± 1926.6

2149.7 ± 557.1

1232.8 ± 85.6

2.5 ± 1.9

31.2 ± 6.0

94.6 ± 59.1

0.1 ± 0.03

2.0 ± 0.6

8.6 ± 1.6

25.5 ± 7.1

n = 3

236.1 ± 24.3

4305.9 ± 880.9

1999.6 ± 251.5

1170.4 ± 58.2

1.9 ± 1.7

27.0 ± 2.8

95.1 ± 15.3

0.1 ± 0.03

1.6 ± 0.7

7.1 ± 1.1

39.7 ± 2.5

n = 3

261.2 ± 41.4

3709.6 ± 627.9

2055.8 ± 200.9

1170.6 ± 121.1

0.6 ± 0.6

34.5 ± 11.0

128.5 ± 56.1

0.1 ± 05

1.2 ± 0.1

5.6 ± 0.2

111.9 ± 98.0

n = 3

205.8 ± 34.3

2231.3 ± 88.7

1391.7 ± 46.9

1714.7 ± 351.7

10.5 ± 0.7

30.0 ± 3.3

272.2 ± 111.8

0.7 ± 0.11

7.4 ± 0.5

5.0 ± 1.5

32.2 ± 5.0

n = 3

204.3 ± 47.2

2443.3 ± 293.0

1570.0 ± 111.3

1555.0 ± 163.3

11.7 ± 1.7

42.7 ± 0.9

249.6 ± 32.0

2.1 ± 1.1

10.1 ± 2.4

4.7 ± 1.2

55.9 ± 20.1

n = 3

213.6 ± 35.0

2178.3 ± 67.3

1629.0 ± 458.3

1352.0 ± 330.0

11.3 ± 1.5

56.9 ± 24.7

248.2 ± 136.7

2.4 ± 1.4

10.8 ± 3.3

5.6 ± 1.6

70.4 ± 35.2

n = 3

248.7 ± 68.6

3926.4 ± 260.3

2317.2 ± 97.1

951.6 ± 93.9

1.4 ± 1.3

25.9 ± 2.1

138.6 ± 27.2

0.3 ± 0.06

1.2 ± 0.2

5.8 ± 0.4

65.0 ± 23.3

n = 3

225.5 ± 53.7

2881.7 ± 507.4

2288.3 ± 276.1

1025.2 ± 102.3

1.4 ± 0.4

56.0 ± 25.7

166.0 ± 52.6

0.6 ± 0.07

1.6 ± 0.1

5.9 ± 0.7

46.4 ± 8.2

n = 3

185.3 ± 4.5

2604.0 ± 446.7

2117.2 ± 105.5

1257.1 ± 125.9

2.0 ± 1.2

73.3 ± 21.2

157.0 ± 50.4

0.8 ± 0.08

2.1 ± 0.5

5.4 ± 0.8

54.1 ± 25.0

n = 3

197.2 ± 28.6

2316.5 ± 112.3

2135.6 ± 271.2

1206.5 ± 50.4

1.7 ± 0.2

72.6 ± 23.3

184.5 ± 87.7

1.1 ± 0.1

2.5 ± 0.3

5.0 ± 0.8

41.7 ± 6.1

n = 3

184.6 ± 25.9

1852.4 ± 123.0

2088.4 ± 246.7

1344.1 ± 211.1

1.8 ± 0.9

88.9 ± 17.8

263.3 ± 82.6

1.5 ± 0.1

2.9 ± 0.3

5.0 ± 0.3

56.1 ± 6.7

n = 2

159.8 ± 6.5

1842.6 ± 84.9

2306.8 ± 39.0

1632.9 ± 118.9

4.2 ± 2.4

162.8 ± 42.7

269.0 ± 76.1

1.8 ± 0.6

5.4 ± 2.1

6.1 ± 0.01

70.2 ± 8.5

n = 4

225.9 ± 33.5

1746.9 ± 98.6

2369.1 ± 241.7

1949.0 ± 132.8

3.7 ± 1.0

178.3 ± 67.7

515.5 ± 203.9

2.2 ± 0.1

5.8 ± 0.5

6.1 ± 0.8

80.3 ± 19.3

n = 3

188.8 ± 33.2

1967.8 ± 193.7

2484.1 ± 1043.5

2031.7 ± 622.0

5.6 ± 3.6

241.3 ± 71.0

791.5 ± 494.3

1.2 ± 0.04

5.1 ± 3.5

5.9 ± 0.9

62.3 ± 17.3

n = 3

291.6 ± 21.9

2880.3 ± 422.5

2972.1 ± 730.3

2461.2 ± 344.0

4.4 ± 2.5

222.0 ± 78.6

744.5 ± 473.8

0.5 ± 1.3

4.0 ± 1.4

6.6 ± 1.1

80.0 ± 24.9

n = 3

286.8 ± 46.7

3823.7 ± 1750.4

2536.4 ± 575.5

2615.5 ± 833.0

3.1 ± 1.7

272.7 ± 15.3

614.7 ± 122.5

0.7 ± 0.2

3.7 ± 0.8

5.8 ± 0.6

86.3 ± 17.9

n = 3

224.2 ± 28.9

3202.9 ± 90.8

3403.1 ± 1343.0

2946.5 ± 1600

4.7 ± 5.7

222.0 ± 85.7

637.1 ± 332.0

0.9 ± 0.7

4.7 ± 3.5

6.5 ± 1.5

116.6 ± 76.0

n = 3

225.7 ± 41.6

2583.9 ± 190.5

2451.9 ± 423.0

2679.8 ± 226.6

3.5 ± 1.4

235.1 ± 90.0

376.8 ± 126.5

0.9 ± 0.2

4.7 ± 0.2

5.3 ± 1.1

103.5 ± 24.7

n = 3

172.8 ± 29.9

1865.3 ± 41.0

2087.5 ± 248.8

2582.8 ± 228.5

6.3 ± 1.3

195.4 ± 25.1

900.0 ± 163.8

1.7 ± 0.4

6.6 ± 1.3

4.7 ± 0.5

84.3 ± 12.0

n = 3

175.8 ± 7.07

2434.0 ± 65.198.6

3132.6 ± 101.85

2985.5 ± 229.9

4.9 ± 0.7

178.9 ± 17.5

575.9 ± 177.5

2.6 ± 0.4

7.9 ± 2.1

5.0 ± 0.4

187.3 ± 63.6