CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
CHEMOMETRICS ASSISTED UV-SPECTROPHOTOMETRIC ...
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Table 5. Actual and predicted amounts of salicylic acid given by applying first derivative<br />
zero crossing points spectrophotometric techniques for pure, synthetic mixtures with<br />
resorcinol and luna soap and dorin emulsion determined at 290.5 nm and 317.5 nm .<br />
Component<br />
analyzed<br />
Pure salicylic acid<br />
Salicylic acid in<br />
binary mixture<br />
Concentrat<br />
ions used<br />
(µg/ml)<br />
µg/ml<br />
Dorin emulsion 10(5) 7.41 130.2 12.8 13.30 266.1 5.1<br />
Luna soap 10(10) 12.27 109.7 0.3 15.26 152.6 3.4<br />
* ( ) the concentrations of resorcinol in the studied mixtures in µg/ml<br />
∗ RSD is the relative standard deviation<br />
Recovery at 290.5 nm Recovery at 317.5 nm<br />
%<br />
39<br />
∗RSD<br />
µg/ml<br />
%<br />
∗RSD<br />
5 5.07 101.4 3.8 6.27 125.3 16<br />
10 10.32 103.3 3.6 10.36 103.6 3.5<br />
15 15.13 100.9 1.9 15.04 100.3 1.0<br />
20 20.45 102.3 3.4 19.60 98.0 4.3<br />
25 23.51 94.0 1.3 22.63 90.5 3.7<br />
30 30.01 100.0 1.3 28.45 94.8 5.2<br />
35 34.74 99.3 0.6 35.78 102.2 1.7<br />
40 40.89 102.2 1.1 41.32 103.3 2.0<br />
45 44.62 99.2 0.8 45.85 101.9 0.6<br />
50 50.26 100.5 1.4 49.69 99.4 0.4<br />
10( 5)* 12.21 118.3 0.1 11.51 115.1 6.9<br />
10(10) 13.16 128.1 0.5 14.10 141.0 6.3<br />
with resorcinol 5(10) 8.64 162.9 2.1 8.57 171.3 5.3