open access

https://hdl.handle.net/2115/93472

Zero-valent iron reduces cadmium and arsenic accumulation in spinach (Spinacia oleracea L.)

英語

zero-valent iron

2023-11-09

Taylor & Francis

Journal of Plant Nutrition

47(4)

646-655

Cadmium (Cd) and arsenic (As) soil contamination poses significant problems for crop production worldwide. Zero-valent iron (Fe-0) is a reactive material with reducing power capable of stabilizing toxic elements, including heavy metals and metalloids. In this study, we examined the effect of Fe-0 application on Cd and As accumulation in spinach (Spinacia oleracea L.) grown in Cd- or As-contaminated soil. Fe-0 soil application reduced Cd and As concentrations in spinach shoots and/or roots, and decreased their availability in soil, which may have affected their accumulation in spinach. Additionally, we examined the forms of soil Cd and As using the sequential extraction method. The potential availability of Cd and As forms in soils for plant root is: exchangeable > iron-manganese-oxide-bound > organic-matter-bound > free-oxide-occluded > residual. Fe-0 application increased Cd and As distribution in the free-oxide-occluded fraction. Additionally, Fe-0 application decreased As distribution in the iron-manganese-oxide-bound fraction while tended to decrease Cd in the organic-matter-bound fraction and increase it in the iron-manganese-oxide-bound fraction. Thus, Fe-0 application can be effective in reducing Cd and As availability in their contaminated soils. Meanwhile, this study showed that Fe-0 application inhibited the growth of spinach in Cd-contaminated soil. The unfavorable alterations caused by Fe-0 in the contaminated soil should also be investigated in the future.

学術雑誌論文

Accepted Manuscript

This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Plant Nutrition on 09 Nov 2023, available online: http://www.tandfonline.com/10.1080/01904167.2023.2280151.

0190-4167