True value (ppb) Peak area 1 Peak area 2 Peak area 3 Bisphenol A in 50.0 69.2 68.9 68.8 drinking water Bisphenol A in wastewater 50.0 50.1 48.3 49.6 Regression equation for linearity range of peak area (y-axis) versus concentrations (x-axis): y = 1.3308x+2.5352 Coefficient of determination, R2 = 0.9978

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