Processing On The Content Of Honey, Two Organophosphorus Pesticides And Macroporous Resin Adsorption Removal

The effects of different steps in honey production on chlorpyrifos and malathion levels are investigated. The removal effect of malathion and chloramphenicol in honey on the macroporous adsorption resin are also studied. The content of this article consisted of four chapters, and the author's work are in the following three aspects.1. Chlorpyrifos and malathion residues in honey are quantified by gas chromatography with flame photometric detection (GC-FPD) after each stage including preheating, filtration, vacuum concentration and pasteurization. The total loss of chlorpyrifos and malathion in honey are about 70% and 22.5%, respectively. Among these four stages, vacuum concentration had the significant effects on chlorpyrifos and malathion levels, and the mean losses were 60.9 and 16.5%, respectively. Filtration had the secondary reduction effect.2. Thermodynamic properties of adsorption of malathion in honey by macroporous adsorption resins (LS-903) were investigated using static adsorption method. Equilibrium data were obtained from the adsorption of malathion in honey at 298K,308K and 318K, respectively and correlated with Freundlich-type of isotherm equation. Freundlich adsorption isotherms and isosteric enthalpy of adsorption indicate that the process of adsorption of malathion by LS-903 resin is an exothermic process. The negative value of△G indicates the spontaneous nature of the adsorption process.3. Adsorptive kinetics of chloramphenicol in honey by macroporous adsorption resions (LS-903) were investigated. The effects of temperature, time and agitation on the adsorption have been investigated. The speeds of adsorption appear to follow pseudo-second-order kinetics model. The adsorption was controlled by pore diffusion and film diffusion. The diffusion coefficients (D) calculated by using Fick's equation were 0.0015 and 0.0010.