| 摘要 |
PURPOSE:To improve recovery and to collect and effective component approximately quantitatively, by a method wherein an effective component is collected from a mothproofing plywood, manufactured by an adhesive mixing method, by the use of formic acid or a mixture solvent containing formic acid as an extraction solvent. CONSTITUTION:1.38pts. a phenitrothion 90% emulsion, consisting of 95pts. phenitrothion original and 5pts. a surface active agent, are mixed to 74.4pts. urea resin. Additionally, 7.52pts. water, 14.9pts. wheat flour, and 1.8pts. a 20% ammonia chloride aqueous solution are added to prepare an adhesive paste. Using a red melanti veneer 18cmX18cm having 7.5% of moisture content, 3-plywood with a thickness of 4.5mm. containing 900g/m<2> phenitrothion is manufacured. An analyzing wood powder is shaved from a plywood to prepare a sample. Formic acid, acetic acid, a 10% phospheric acid aqueous solution or 2.5ml formic acid and 47.5ml toluene are added to 2g a sample wood powder shaved from a chlordane admixture plywood, an extraction is made by immersing it for 6hr at room temperature, and a chlordane content in sample liquid is quantitatively measured by a color meter, which results in improving a recovery. |
