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Table 1 Pearson correlation matrices between atomic number (Z), average of elements contents (C), relative standard deviation (RSD) and relative average deviation in three matrices of CRMs (soil, plant and animal tissue)

From: Between-bottle homogeneity test of new certified reference materials employing wavelength dispersive X-ray fluorescence spectrometry

  Z C RSD RAD
KACST401
 Z 1.000    
 C − 0.305 1.000   
 RSD 0.138 − 0.268 1.000  
 RAD 0.137 − 0.282 0.995 1.000
KACST302
 Z 1.000    
 C − 0.319 1.000   
 RSD 0.426 − 0.303 1.000  
 RAD 0.424 − 0.301 0.998 1.000
KACST201
 Z 1.000    
 C − 0.224 1.000   
 RSD 0.349 − 0.253 1.000  
 RAD 0.342 − 0.251 1.000 1.000