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.