Determination of the compound salicylic acid tincture by dual-wavelength spectrometry

Objective To develop a method for determining phenol and salicylic acid in compound salicylic acid tincture.Methods The dual-wavelength spectrometry method was used for eliminating mutual interference direct determination.Determination of phenol wavelength of 269.5 nm,the reference wavelength of 327.5 nm;smlicy acid in the wavelength of 302.5 nm with reference wavelength.Results Average recovery rate of 100.4%(RSD=0.93%)for phenol and 99.7%(RSD=0.37%)for salicylic acid coeflicient of r=0.999 5 for phenol and r=0.999 8 ofr salicylic acid.Conclusions The method was simple and accurate with satisfactory results.