Statistically Coherent Calibration of X-Ray Fluorescence Spectrometry for Major Elements in Rocks and Minerals

Table 2

Regression (x-y): matrix-corrected intensity-concentration (IntCorr-Conc) parameters.

Element	Regression		Number of data pairs (calibrators)	Regression equation parameters						Quality of regression equation
	Variables -	Model		Intercept ()			Slope ()
SiO2	IntCorr-Conc	OLR	60	10.8541	1.6762	4.4641	0.1452	0.0055	0.0146	0.96105	0.92362
	IntCorr-Conc	UWLR	60	−0.0148	0.9765	2.6006	0.1848	0.0032	0.0085	0.99157	0.98321
TiO2	IntCorr-Conc	OLR	60	0.0344	0.0220	0.0587	0.0736	0.0016	0.0043	0.98644	0.97307
	IntCorr-Conc	UWLR	60	0.0020	0.0204	0.0542	0.0801	0.0015	0.0040	0.99114	0.98235
Al2O3	IntCorr-Conc	OLR	60	−0.1675	0.6763	1.8011	0.1514	0.0056	0.0150	0.96237	0.92615
	IntCorr-Conc	UWLR	60	−0.0070	0.4419	1.1769	0.1397	0.0037	0.0098	0.98557	0.97135
Fe2O3^t	IntCorr-Conc	OLR	60	−2.0576	0.5960	1.5873	0.2160	0.0066	0.0175	0.97419	0.94904
	IntCorr-Conc	UWLR	60	−0.0092	0.5458	1.4536	0.1772	0.0060	0.0160	0.98112	0.96259
MnO	IntCorr-Conc	OLR	60	−0.0412	0.0067	0.0178	0.0214	0.0003	0.0009	0.99348	0.98700
	IntCorr-Conc	UWLR	60	0.0001	0.0134	0.0356	0.0165	0.0007	0.0017	0.99160	0.98328
MgO	IntCorr-Conc	OLR	60	−0.0977	0.2748	0.7319	0.2618	0.0064	0.0170	0.98317	0.96662
	IntCorr-Conc	UWLR	60	−0.0014	0.2692	0.7168	0.2376	0.0063	0.0167	0.98745	0.97505
CaO	IntCorr-Conc	OLR	60	1.0561	0.2173	0.5789	0.0631	0.0014	0.0037	0.98643	0.97304
	IntCorr-Conc	UWLR	60	0.0064	0.4616	1.2293	0.0853	0.0029	0.0078	0.98657	0.97331
Na2O	IntCorr-Conc	OLR	60	0.0447	0.0567	0.1511	0.3624	0.0077	0.0205	0.98716	0.97449
	IntCorr-Conc	UWLR	60	0.0054	0.0421	0.1122	0.3558	0.0057	0.0152	0.99345	0.98693
K2O	IntCorr-Conc	OLR	60	−0.0720	0.0430	0.1146	0.0719	0.0007	0.0020	0.99691	0.99383
	IntCorr-Conc	UWLR	60	0.0082	0.0391	0.1042	0.0687	0.0007	0.0018	0.99793	0.99587
P2O5	IntCorr-Conc	OLR	60	0.0537	0.0128	0.0341	0.0241	0.0008	0.0021	0.96972	0.94035
	IntCorr-Conc	UWLR	60	0.0010	0.0202	0.0538	0.0320	0.0013	0.0033	0.96929	0.93952

, intercept; , standard error; , uncertainty at 99%; , slope; , linear correlation coefficient; , squared linear correlation coefficient.