Using isotopes to trace freshly applied cadmium through mineral phosphorus fertilization in soil-fertilizer-plant systems
File(s)
Supporting information
Author(s)
Type
Journal Article
Abstract
Applications of mineral phosphorus (P) fertilizer can lead to cadmium (Cd) accumulation in soils and can increase Cd concentrations in edible crop parts. To determine the fate of freshly applied Cd, a Cd source tracing experiment was conducted in three soil-fertilizer-wheat systems by using a mineral P fertilizer labeled with the radio isotope 109Cd and by exploiting natural differences in Cd stable isotope compositions (δ114/110Cd). Source tracing with stable isotopes overestimated the proportion of Cd in plants derived from the P fertilizer, because the isotope ratios of the sources were not sufficiently distinct from those of the soils. Despite indistinguishable extractable Cd pools between control and treatments, the addition of P fertilizer resulted in a more negative apparent isotope fractionation between soil and wheat. Overall, the radio isotope approach provided more robust results and revealed that 6.5 to 15% of the Cd in the shoot derived from the fertilizer. From the introduced Cd, a maximum of 2.2% reached the wheat shoots, whilst 97.8% remained in the roots and soils. The low recoveries of the fertilizer derived Cd suggest that continuous P fertilizer application in the past decades can lead to a build-up of a residual Cd pool in soils.
Date Issued
2019-01-15
Date Acceptance
2018-08-09
Citation
Science of the Total Environment, 2019, 648, pp.779-786
ISSN
0048-9697
Publisher
Elsevier
Start Page
779
End Page
786
Journal / Book Title
Science of the Total Environment
Volume
648
Copyright Statement
© 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor
Science and Technology Facilities Council
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/30138877
PII: S0048-9697(18)33091-2
Grant Number
4070200262
Subjects
Cadmium
Mineral P fertilizer
Pot experiment
Radio isotopes
Source tracing
Stable isotopes
Wheat
Publication Status
Published
Coverage Spatial
Netherlands
Date Publish Online
2018-08-14