Recovery (%)a     CARV HCT Method 3D 4D 1DD 3D 4D 1DD Wavelength (nm) 245.9 247.4 236.1 230.2 226.9 261.1 Added (µg.mL-1)   CARV HCT 8.0 2.0 100.00 99.50 100.01 99.32 99.75 101.05 8.0 4.0 101.87 99.73 101.05 101.17 100.15 100.08 8.0 6.0 100.90 100.75 102.00 100.87 101.07 101.12 8.0 8.0 100.00 100.01 101.02 101.60 100.40 100.09 12.0 10.0 99.47 99.90 99.89 100.33 99.37 102.00 14.0 10.0 99.68 100.02 99.97 99.92 99.58 100.06 16.0 10.0 100.44 99.80 100.30 99.70 100.03 99.63 18.0 10.0 99.76 99.54 99.61 100.04 100.11 99.89 Mean recovery (%) 100.26 99.91 100.48 100.37 100.06 100.49 RSD% 0.79 0.39 0.81 0.78 0.53 0.81 a Mean of three independent analyses

Table 2: Determination of carvedilol (CARV) and hydrochlorothiazide (HCT) in laboratory prepared mixtures using 3D, 4D, and 1DD methods.