气相色谱法测定污水中对硫磷的农残量

A produce for enriching parathion from vegatables and polluted water with adsorbent GDX-501 is described.The eluente was separated and analyzed by gas chromatography with flame photometric detector.Detection limit of Parathion in water is 0.4μg/L.Average recoveries of Parathion added in water are in the range of 88.6%～99.3%.The relative standard deviations are in the range of 3.2%～5.0%.The method is simple,accurate and precise.

木屑碱熔法制取草酸

木屑一般是作为废料烧掉的,这实在是一种浪费。本文介绍了从木屑中制草酸的通常三种方法:(1)硝酸氧化法;(2)碱烧法;(3)发酵法。经对比,认为碱烧法较好,并在实验中找出了此法的最佳碱木屑化,最佳反应条件。

杂多酸催化合成烯类单体丙烯酸酯

该文研究了杂多酸催化合成烯类单体丙烯酸酯的最佳合成工艺条件。