The preparation of α asarone from volatile oil of grassleaf sweetflag rhizome via alkali fusion was investigated .

对 KOH熔融法从石菖蒲 挥发油（以下简称挥发油）制备α细辛醚的 工艺过程进行了研究。

According to the characteristics that vitamin C can absorb ultraviolet radiation and is volatile to alkali this article establishes a new and fast method to determine the content of vitamin C in fruits and vegetables by ultraviolet spectrophotometry .

本文利用维生素C具有对紫外产生吸收和对 碱 不 稳定的特性，建立了紫外分光光度快速测定水果、蔬菜维生素C含量的新方法。

Using volatile acid and alkali to regulate the pH of pressed juice from bamboo shell saltless Fraction ⅰ and Fraction ⅱ were got separately .

采用 挥发性酸和 碱调节鲜笋壳压榨液pH值，分别获得无盐FractionⅠ和fractionⅡ；

But biomass contains high amounts of volatile alkali metals and chlorine which can cause deposition corrosion and agglomeration during combustion .

但生物质中含有大量 易 挥发 的 碱金属和氯元素，在燃烧过程中会造成沉积、聚团和腐蚀等问题。

The results showed that 60 % conversion of volatile oil and 33 % yield of α asarone could be attained using low alkali amount and without dehydration before recrystallization .

结果表明：在使用低的 碱用量、产物重结晶前不经无水硫酸钠脱除残余水分的条件下， 挥 发油的转化率可达60%，α细辛醚的一次得率可达33%。

Chlorine is a volatile element in the acidic media for its activity in chemistry and can be absorbed by alkali substance .

氯的化学性质活泼，在酸性介质中具有 挥发性，由 碱性物质吸收。