Fate and Distribution of Heavy Metals in Wastewater Irrigated Calcareous Soils

Figure 5

Distribution of Zn, Ni, and Cd in ZR1 soil with and without HFO amendment following addition of 1280 mg kg⁻¹ ((a), (c), and (e)) and 3200 mg kg⁻¹ ((b), (d), and (f)) of metal solution. Mean values followed by the same letter within a column are not different at 𝑃<0.05 by 𝑡-test. F1: soluble and exchangeable; F2: carbonate bound; F3: Fe/Mn oxide; F4: organic bound; F5: residual.

(a)

(b)

(c)

(d)

(e)

(f)