50 Calibration graph 45 response 40 y = 54.011x + 0.4167 35 r = 0.9982 30 25 0.2 0.4 0.6 0.8 1 20 Conc ppm 15 10 5 0 0 15.2=0.4167 +54.011 (x) X=0.274 ppm