中文摘要：

对下蜀黄土碳酸钙含量的测定采用气量法即二氧化碳气体体积法。为了使测定装置结构简单、操作简便、读数精确,对其进行了简化和改进。推荐一种较好的测定下蜀黄土碳酸钙含量的实验装置,即,①用侧面肩部带一个细颈的抽滤瓶代替三角瓶,使橡皮塞只需打一个孔即可,增加了装置的气密性;②在酸式滴定管底端连接一个带玻璃管（或圆珠笔管）的橡皮管,在抽滤瓶的细颈端连接一根橡皮管,使得盐酸与土壤样品反应的过程中摇动反应瓶时起到缓冲作用;③对碳酸钙含量很低的下蜀黄土样品来说,在测定碳酸钙含量的实验中用25 mL的酸式滴定管更加合适,而且调整液面的左右两端的管子也都用25 mL的碱式滴定管。

英文摘要：

The determination method of carbonate content of the Xiashu loess is improved by measuring gas volume method. In this experiment,the improvement contains the following steps： 1. Improving the producing carbon dioxide gas plant：（ 1） using the vitreous Buchner flask to instead of the triangle bottle,by making a hole in the rubber plug;（ 2） joining the acid burette bottom and the rubber tube with glass tube（ or ball pen tube）,and to joining the vitreous Buchner flask neck and a rubber tube;（ 3） replacing acid burette 50ml by 25 mL. 2. Improving testing carbon dioxide gas plant：（ 1） replacing alkali burette 50 mL by 25 mL;（ 2） using two 25 mL alkali burettes on the left and right sides.（ 3） for the Xiashu Loess with relatively low carbonate content,it＇s more appropriate that to use the 25 mL acid burette when measuring carbonate content,and to use two 25 mL alkali burettes to adjust the liquid,which make the measurement device has the advantage of simple structure,convenient operation,accurate reading.