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Table 1 Average concentration of PTEs found in soil farmlands and irrigation water

From: Health risk assessment of potentially toxic elements via consumption of vegetables irrigated with polluted river water in Addis Ababa, Ethiopia

Element Burayu Kolfea Kera Gofa Akaki Guidelines for max. levels in
River (μg/L) Soil (mg/kg) River (μg/L) Soil (mg/kg) River (μg/L) Soil (mg/kg) River (μg/L) Soil (mg/kg) River (μg/L) Soil (mg/kg River (μg/L)a Soil (mg/kg)b
As < 1.0 2.44 1.3 2.21 1.1 2.41 1.2 2.09 1.9 1.87 100 20
Ba 55.5 96.42 125 128.48 102.5 272.92 130 175.14 145 187.64
B 11 0.10 1000 6.17 53.5 0.32 148 0.03 115 0.45 750
Cd 0.06 0.17 0.06 0.13 0.06 0.23 0.04 0.17 0.06 0.16 10 3
Cr 2.4 42.94 255 234. 23 2.35 42.25 3.85 49.87 46 21.16 100 100
Co < 1.0 21.72 2.05 24.89 2.65 21.05 2.1 21.49 2.15 14.63 50 50
Cu 5.75 23.64 3.3 33.46 5.55 21.16 6.55 22.42 6.35 18.34 200 100
Fe 974 35,217 905 37,011 945 35,541 565 36,595 555 26,280 5000 50,d000c
Mn 38 1135 2000 894.48 1150 1489.81 1300 1224.97 1400 844.21 200 2000c
Ni 3.1 36.15 4.9 52.58 5.15 27.70 3.9 34.30 6.5 29.58 200 50
Sr 98.5 13.78 315 27.25 395 23.43 350 28.09 365 34.96
V 3.2 57.23 5.95 63.37 3.4 54.36 3 51.90 3.9 39.80 100
Zn 13 56.00 21 52.38 21.5 80.94 10.9 81.82 22.5 68.31 200 300
  1. aAyers and Westcot (1994), bEwers (1991), cPendias and Pendias (1992)
  2. Exceedences of thresholds are in italics