Plant Uptake of Organic Pollutants from Soil: A Critical Review of Bioconcentration Estimates Based on Modelsand Experiments Page: 4 of 40
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
The role of terrestrial vegetation in transferring chemicals from soil and air into specific plant
tissues (stems, leaves, roots, etc.) is still not well characterized. We provide here a critical review
of plant-to-soil bioconcentration ratio (BCR) estimates based on models and experimental data.
This review includes the conceptual and theoretical formulations of the bioconcentration ratio,
constructing and calibrating empirical and mathematical algorithms to describe this ratio and the
experimental data used to quantify BCRs and calibrate the model performance. We first evaluate
the theoretical basis for the BCR concept and BCR models and consider how lack of knowledge
and data limits reliability and consistency of BCR estimates. We next consider alternate
modeling strategies for BCR. A key focus of this evaluation is the relative contributions to
overall uncertainty from model uncertainty versus variability in the experimental data used to
develop and test the models. As a case study, we consider a single chemical, hexahydro-1,3,5-
trinitro-1,3,5-triazine (RDX), and focus on variability of bioconcentration measurements
obtained from 81 experiments with different plant species, different plant tissues, different
experimental conditions, and different methods for reporting concentrations in the soil and plant
tissues. We use these observations to evaluate both the magnitude of experimental variability in
plant bioconcentration and compare this to model uncertainty. Among these 81 measurements,
the variation of the plant/soil BCR has a geometric standard deviation (GSD) of 3.5 and a
coefficient of variability (CV-ratio of arithmetic standard deviation to mean) of 1.7. These
variations are significant but low relative to model uncertainties--which have an estimated GSD
of 10 with a corresponding CV of 14.
Here’s what’s next.
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
McKone, Thomas E. & Maddalena, Randy L. Plant Uptake of Organic Pollutants from Soil: A Critical Review of Bioconcentration Estimates Based on Modelsand Experiments, article, January 1, 2007; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc894925/m1/4/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.