A new mode for an on-line determination of Pyrocatechol, Resorcinol, and Pyrogallol in pure commercial samples using CFIA with homemade Ayah 3SBGRx3- 3D solar cell microphtometer analyzer


A new, simple, accurate, fast and sensitive spectrophotometric method has been developed for the analysis of Pyrocatechol, Resorcinol, and pyrogallolin pure commercial samples by continuous flow injection analysis. The method was based on the oxidation of the organic compounds with Ce(IV)sulfate in acidic medium to formed a brown colored species which determined using homemade Ayah 3SBGR x3-3D solar cell flow injection microphotometer. Optimum conditions were obtained using a high intensity green light emitted diode as an irradiation source forPyrocatechol, Resorcinol, whileblue light emitted diode as an irradiation source for pyrogallol. The linear dynamic range for the instrument response versus Pyrocatechol, Resorcinol, and pyrogallol concentrationswere5-40mmol.L-1 while the L.O.D was of 36.63, 17.17, and 41.61ng / sample respectively. The correlation coefficient (r) was 0.9952, 0.9970, and 0.9960 while percentage linearity (r2%) was 99.05%, 99.41% and 99.22%forPyrocatechol, Resorcinol, and pyrogallol respectively. RSD% for the repeatability (n=8,7, and 8) was 1.4%, 0.63%, 1.78% for the determination of Pyrocatechol, Resorcinol,andpyrogallol, respectively at concentration of 30 mmol.L-1. The method was applied successfully for the determination of three organic compounds in purecommercial samples. A comparison was made between the newly developed method and the classical method (UV-Vis spectrophotometry) at wave length 492, 481, and 438 nm forPyrocatechol, Resorcinol and pyrogallolrespectively of analysis using the standard additions method via the use of paired t-test. It was noticed that there is no significant difference between two different methods for analysis three different organic compounds; in addition to no significant difference in the contribution of the Pyrocatechol, Resorcinol and pyrogallol to the oxidant reaction path, at 95% confidence level.