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Plackett-Burman Design Analysis

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Plackett–Burman design
ANOVA was used assess the screen the statistically significant factors for VASEME are presented in table a. The parameter effect 95% confidence level (p0.05) was found insignificant describing the significant model correlation between the variables and process response. Analysis of variance (ANOVA) was used to evaluate the main effect of vortex time (sec, X1), CCl4 volume (µl, X2) and temperature (oC, X3), their interaction along with quadratic model were evaluated. The polynomial equation for the response is as follows
ER%= 74.095 +7.948x1 +12.221x2 +3.406x3 −4.067x21−6.765x22+3.250x1x3 +1.500x2x3 (6)

The combination of condition of the variables (extracting solvent volume CCl4, temperature and vortex time) that maximize …show more content…

In microextraction techniques, the dispersion of the extracting solvent in the aqueous phase, through emulsification by surfactant enhances the mass transfer of analyte to the organic phase. Nature of surfactant, significantly affects extraction process, through optimum emulsification. Three surfactants of different nature Sodium Dodecyl Sulfate SDS (anionic), Cetyltrimethyl ammonium bromide, CTAB (cationic) and Triton X-100 (nonionic) were evaluated for their effect on extraction efficiency, while other parameters were kept constant. The hydrophile–lipophile balance value indicative of hydrophilicity, SDS had 40 and Triton X-100 values were 40 and 13.4 were not suitable for this method, while CTAB value15.8 gave the best extraction of the all the analyte fig. Surfactant concentration is also important for the Different concentration 0.1-0.3mM of CTAB was further evaluated for the effective extraction; with the optimum concentration of 0.2mM CTAB gave the bets extraction without any chromatographic analysis …show more content…

Best extraction is possible with extraction solvent having basic properties like high partition coefficient, high vapor pressure, low water solubility and high boiling point, and its ability to extract the analyte. ref. Organic solvent like chloroform and carbon tetrachloride with constant volume were evaluated for their extraction capability and found that carbon tetrachloride (CCl4) had the excellent extraction efficiency for fipronil and its metabolite was used for the study fig. The volume of extracting solvent required for equilibrium was evaluated by the experimental

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