Figure 5.
Models using values of first derivate of UV absorbance from one, two, or three wavelengths to estimate concentration of UA: (a) calibration group (N = 579) and (b) validation group (N = 639).
Models using values of first derivate of UV absorbance from one, two, or three wavelengths to estimate concentration of UA: (a) calibration group (N = 579) and (b) validation group (N = 639).