Modeling temperature of pellet press matrix for wood pellets. On the basis of active industrial experiments on industrial equipment mathematical dependence is obtained, showing the change in temperature of the matrix during the granulation of wood pellets. This dependence, adequate to real conditions, can be effectively used to control this important parameter that provides stable operation of the equipment. Minimum temperature of the matrix, determined from the results of presented research, increases service life of matrix and reduces the probability of emergency situations.
Multiresidue matrix solid-phase dispersion (MSPD) technique with capillary gas chromatographic detection for determination and quantification of ten commonly used organophosphorus pesticides (chlorpyrifos, chlorpyrifos-methyl, diazinon, dimethoate, fenitrothion, formothion, malathion, parathion, phosalone, pirimiphos-methyl) in fruits and vegetables is described. The method gave high recoveries for all spiked samples in 80-120% range. The limits of detection were from 0.01 to 0.1 mg/kg for the compounds studied and were much lower than maximum residue levels (MRLs) allowed. The procedure was applied to the determination of ten organophosphorus pesticides in samples collected during the routine crop monitoring.