. Author manuscript; available in PMC: 2016 Apr 11.

Published in final edited form as: Spectrochim Acta Part B At Spectrosc. 2016 Feb 1;116:21–27. doi: 10.1016/j.sab.2015.11.008

Table 2.

Linear regression equation, coefficients of determination, response factors, and offset values of working standards developed using different sunscreen matrices.

Matrix	Working standard	Linear regression equation	Coefficient (r²)	Response factor	Offset
Matrix A	Ti	y = 1.66x + 0.22	0.9979	0.60	−0.14
Matrix B	Ti	y = 1.59x + 0.30	0.9999	0.64	−0.19
Matrix C	Ti	y = 1.59x + 0.35	0.9986	0.63	−0.22
Matrix A	Zn	y = 1.21x + 0.61	0.9973	0.83	−0.51
Matrix B	Zn	y = 1.22x + 0.68	0.9965	0.82	−0.56
Matrix C	Zn	y = 1.24x + 0.65	0.9967	0.81	−0.52