Predicting plant uptake of cadmium: validated with long-term contaminated soils.
Cadmium accumulates in plant tissues at low soil loadings and is a concern for human health. Yet at higher levels it is also of concern for ecological receptors. We determined Cd partitioning constants for 41 soils to examine the role of soil properties controlling Cd partitioning and plant uptake. From a series of sorption and dose response studies, transfer functions were developed for predicting Cd uptake in Cucumis sativa L. (cucumber). The parameter log Kfwas predicted with soil pHca, logCEC and log OC. Transfer of soil pore-water Cd2+to shoots was described with a power function (R2= 0.73). The dataset was validated with 13 long-term contaminated soils (plus 2 control soils) ranging in Cd concentration from 0.2 to 300 mg kg-1. The series of equations predicting Cdshootfrom pore-water Cd2+were able to predict the measured data in the independent dataset (root mean square error = 2.2). The good relationship indicated that Cd uptake to cucumber shoots could be predicted with Cdporeand Cd2+without other pore-water parameters such as pH or Ca2+. The approach may be adapted to a range of plant species.
Global Centre for Environmental Remediation (GCER), The University of Newcastle (UoN), Callaghan, NSW, 2308, Australia. dane.lamb@newcastle.edu.au.|Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia. dane.lamb@newcastle.edu.au.
Dane T
DT
Lamb
Global Centre for Environmental Remediation (GCER), The University of Newcastle (UoN), Callaghan, NSW, 2308, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.
Mohammed
M
Kader
Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.|Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes, SA, 5095, Australia.
Hui
H
Ming
Global Centre for Environmental Remediation (GCER), The University of Newcastle (UoN), Callaghan, NSW, 2308, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.
Liang
L
Wang
Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.|Centre for Environmental Risk Assessment and Remediation, University of South Australia, Building X, Mawson Lakes, SA, 5095, Australia.
Sedigheh
S
Abbasi
Global Centre for Environmental Remediation (GCER), The University of Newcastle (UoN), Callaghan, NSW, 2308, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.
Mallavarapu
M
Megharaj
Global Centre for Environmental Remediation (GCER), The University of Newcastle (UoN), Callaghan, NSW, 2308, Australia.|Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Advanced Technology Building, Callaghan, NSW, 2308, Australia.
Ravi
R
Naidu
D002104:Cadmium / Q000378:metabolism*; D004784:Environmental Monitoring / Q000379:methods*; D010944:Plants / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000378:metabolism*
D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium
Ageing; Bioaccumulation; Food chain; Partitioning; Phytotoxicity; Pore-water