9 research outputs found
Descriptive statistics for heavy metal concentrations in soils by PXRF methods (mg/kg).
<p>Descriptive statistics for heavy metal concentrations in soils by PXRF methods (mg/kg).</p
Classes of soil heavy metal pollution[31–33].
<p>Classes of soil heavy metal pollution[<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172438#pone.0172438.ref031" target="_blank">31</a>–<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172438#pone.0172438.ref033" target="_blank">33</a>].</p
Prediction scatter plot of pH (a) and VIP scores of optimized PLSR model (b).
<p>Prediction scatter plot of pH (a) and VIP scores of optimized PLSR model (b).</p
Regression of PXRF measurements against ICP-AES analysis for trimmed datasets.
<p>The red, green and blue dotted lines represent the national standard value of heavy metals when pH <6.5, 6.5–7.5 and >7.5.</p
Comparison of heavy metal pollution grade classification between PLSR and chemical analysis.
<p>Comparison of heavy metal pollution grade classification between PLSR and chemical analysis.</p
Comparison between the prediction accuracy of PLSR models with different spectral preprocessing methods.
<p>Comparison between the prediction accuracy of PLSR models with different spectral preprocessing methods.</p
Descriptive statistics for heavy metal concentrations in soils (mg/kg).
<p>Descriptive statistics for heavy metal concentrations in soils (mg/kg).</p