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快速测定松脂中含水量的方法的原理是:在松脂的丙酮溶液中,鲜红色的活性染料5 CX 只有当水份存在下才溶解。随后在松脂的丙酮溶液中加入 NaCl 的饱和溶液,使产生盐析作用。这时,松脂的树脂成份盐析出来,而染料的水溶物残留在下层。松脂的含水量与水溶液被染红的程度成正比。再按照比色滴定所消耗的标准染料溶液确定松脂试样的含永量(用%)。文中介绍了测定和计算方法。分析的时间为15—20分钟,平均相对计算误差为±5%。
The principle of rapid determination of water content in turpentine is that the bright red reactive dye 5 CX dissolves only in the presence of water in the turpentine acetone solution. Subsequently, a saturated solution of NaCl is added to the turpentine acetone solution to cause salting out. At this time, the rosin resin component salted out, while the dye water soluble residue in the lower. Rosin water content is proportional to the degree of staining with aqueous solution. Again according to the standard dye solution consumed by the colorimetric titration of pine resin sample containing the volume (in%). The article describes the measurement and calculation methods. The analysis time was 15-20 minutes with an average relative calculation error of ± 5%.