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Uncertainty and Sensitivity Analysis of Spatial Predictions of Heavy Metals in Wheat

D. J. Brus*,a and M. J. W. Jansenb

a Alterra, Green World Research, P.O. Box 47, 6700 Wageningen, the Netherlands
b Biometris, Bornsesteeg 47, 6708 PD Wageningen, the Netherlands



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Fig. 1. Fitted versus measured log(Cd) concentration in wheat in mg kg–1 dry weight.

 


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Fig. 2. Fitted versus measured log(Pb) concentration in wheat in mg kg–1 dry weight.

 





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Fig. 3. Predicted Cd concentration in wheat (mg kg–1 dry weight): (A) 5th percentile, (B) median, and (C) 95th percentile of 1000 simulated Cd concentrations per node. (D) Safe areas, that is, areas where 95th percentile is below the food quality standard of Cd in wheat (0.235 mg kg–1 dry weight).

 




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Fig. 4. Predicted Pb concentration in wheat (mg kg–1 dry weight): (A) 5th percentile, (B) median, and (C) 95th percentile of 1000 simulated Pb concentrations per node.

 


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Fig. 5. Cumulative frequency distribution (over nodes) of probabilities that Cd and Pb in wheat exceed their quality standards.

 





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Journal of Natural Resources
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