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Table 1 Certified mean values (mg kg-1) for Montana I (SRM 2710a) soil reference material and the mean values we found for selected elements from this sample following aqua regia digestion.

From: Risk of human exposure to arsenic and other toxic elements from geophagy: trace element analysis of baked clay using inductively coupled plasma mass spectrometry

Element As Cd Fe Mn Pb Zn
Certified value 1540 ± 100 12.3 ± 0.3 43200 ± 800 2140 ± 60 5520 ± 30 4180 ± 150
Found value 1430 ± 90 11.3 ± 0.7 34500 ± 320 1610 ± 70 5580 ± 240 3760 ± 80
% Recovery 93 90 80 75 101 80
Detection limita 0.1 0.002 3.9 0.1 0.3 1.3
  1. a Detection limits were calculated as 3 × standard deviation (3 × Std. Dev.) of blank values.