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. 2021 Sep 29;9(10):240. doi: 10.3390/toxics9100240

Table 1.

Instrument Modes and Internal Standard Assignments.

Element Isotope Instrument Mode Cell Gas Quantitated Ion Quantitated Mass Internal Standard
27Al MS-MS H2 27Al+ 27 169Tm+
52Cr MS-MS NH3 52Cr(NH3)2+ 86 103Rh(NH3)4+
56Fe MS-MS NH3 56Fe(NH3)2+ 90 103Rh(NH3)4+
59Co MS-MS NH3 59Co(NH3)2+ 93 103Rh(NH3)4+
60Ni MS-MS O2 60NiO+ 76 103RhO+
63Cu MS-MS NH3 63Cu(NH3)2+ 97 103Rh(NH3)4+
111Cd MS-MS O2 111Cd+ 111 103RhO+
118Sn SQ No Gas 118Sn+ 118 103Rh+
137Ba SQ No Gas 137Ba+ 137 169Tm+
206+207+208Pb SQ No Gas 206+207+208Pb+ 206 + 207 + 208 103Rh+

Cell parameters: 0.55 mL/min O2 cell gas with −20 V octopole bias, −8 V energy discrimination;.4.5 mL/min 10% NH3, 90% He cell gas with −18 V octopole bias, −8 V energy discrimination. 5.0 mL/min H2 cell gas with −18 V octopole bias, 0 V energy discrimination; No Gas with −8 V octopole bias, 5 V energy discrimination. SQ: Single Quad mode, MS-MS: triple quad mode.