Masshunter software version 4.4

Trace element analyses was performed on an Agilent 7900 quadrupole Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) equipped with a High Matrix Introduction system and Agilent Mass
Hunter software (version 4.4) for instrument control and data processing (Agilent Technologies 2009). Detailed parameters for method quantification, adjustments and validation are outlined in (Webster et al. 2021, under review) and in (Webster et al. 2021a ) for analysis of environmental samples. In brief, Argon as the dilution gas was added before sample introduction into the plasmas.
Helium collision cell mode using the 4 th generation Octopole Reaction System was used for analysis of element isotopes 11 B, 55 Mn, 56 Fe, 59 Co, 60 Ni, 63 Cu, 66 Zn, 95 Mo. Inter-element corrections were made for possible isobaric interferences of high 115 Sn on 115 In used as internal standard. Hydrogen reaction gas was used to measure 78 Se to improve sensitivity and remove the dual-charged interference from 156 Gd observed in some samples during initial investigation. Optimization for sensitivity and low oxide ratios (CeO/Ce < 0.3%) was performed daily.

Trace element analyses was performed on an Agilent 7900 quadrupole Inductively Coupled Plasma-Mass Spectrometer (ICP-MS) equipped with a High Matrix Introduction system and Agilent Mass Hunter software (version 4.4) for instrument control and data processing (Agilent Technologies 2009) . Detailed parameters for quantification, adjustments and validation are outlined in Webster et al. (under review) . In brief, Argon as the dilution gas was added before sample introduction into the plasmas. Helium collision cell mode using the 4 th generation Octopole Reaction System was used for analysis of element isotopes 11 B, 27 Al, 51 V, 52 Cr, 55 Mn, 56 Fe, 59 Co, 60 Ni, 63 Cu, 66 Zn, 75 As, 88 Sr, 95 Mo, 111 Cd, 118 Sn, 121 Sb, 137 Ba, 202 Hg and 208 Pb. Inter-element corrections were made for possible isobaric interferences of high 115 Sn on 115 In used as internal standard. Lead was expressed as the sum of isotope masses 206, 207 and 208. Hydrogen reaction gas was used to measure 78 Se to improve sensitivity and remove the dual-charged interference from 156 Gd observed in some samples during initial investigation. Optimization for sensitivity and low oxide ratios (CeO/Ce < 0.3%) was performed daily.