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. Author manuscript; available in PMC: 2020 May 27.
Published in final edited form as: Chem Geol. 2017 Dec 10;474:1–8. doi: 10.1016/j.chemgeo.2017.10.004

Table 6.

Mean, standard deviation and threshold values calculated from log-transformed data for H2O2– and NaOH-extractable Cr (× 10−8 mol/kg).

Extraction Mean Threshold
H2O2 41 97
NaOH 3 7