Table T1. X-ray fluorescence operating conditions.

Oxide or element	Line	Crystal	Detector	Collimator	Peak angle (° 2)	Background offset (° 2)	Count time on peak (s)	Count time on background (s)
SiO2	K	PET	FPC	Medium	109.21		40
TiO2	K	LIF200	FPC	Fine	86.14		40
Al2O3	K	PET	FPC	Medium	145.12		100
Fe2O3	K	LIF200	FPC	Fine	57.52		40
MnO	K	LIF200	FPC	Fine	62.97		100
MgO	K	TLAP	FPC	Medium	45.17	±0.80	150	150
CaO	K	LIF200	FPC	Medium	113.09		40
Na2O	K	TLAP	FPC	Medium	54.10	-1.20	150	150
K2O	K	LIF200	FPC	Medium	136.69		100
P2O5	K	GE111	FPC	Medium	141.04		100
Rh	K Compton	LIF200	Scint	Fine	18.58		60
Nb	K	LIF200	Scint	Fine	21.40	+0.35	200	100
Zr	K	LIF200	Scint	Fine	22.55	-0.35	100	50
Y	K	LIF200	Scint	Fine	23.80	-0.40	100	50
Sr	K	LIF200	Scint	Fine	25.15	-0.40	100	50
Rb	K	LIF200	Scint	Fine	26.62	-0.60	100	50
Zn	K	LIF200	Scint	Medium	41.81	-0.55	100	50
Cu	K	LIF200	Scint	Fine	45.03	-0.55	100	50
Ni	K	LIF200	Scint	Medium	48.67	-0.60	100	50
Cr	K	LIF200	FPC	Fine	69.35	-0.50	100	50
V	K	LIF220	FPC	Fine	123.06	-0.50	100	50

Notes: All major elements measured using a rhodium X-ray tube operated at 30 kV and 80 mA. Trace elements are measured using a rhodium X-ray tube operated at 60 kV and 50 mA. Detector: FPC = flow proportional counter (P10 gas); Scint = NaI Scintillation counter. Detection limits in weight percent for major oxides, parts per million for trace elements.