用气量法测定土壤中的CaCO_3含量,其准确度虽不如重量法高,但由于气量法简单迅速,因而使用仍较广泛。此法在测定结果的计算上有两种方法,一是用不同量的标准CaCO_3系列与盐酸反应,根据产生的CO_2体积,绘制成工作曲线,在测得试样的CO-2体积后,便可从工作曲线上直接查出CaCO-3的含量,然后再换算成试样的CaCO_3百分含量;另一种方法是,根据 The gas content of soil CaCO_3 content, although its accuracy is not as high as the weight method, but the gas volume method is simple and rapid, and therefore still more widely used. There are two ways to calculate the determination result. One is to use different amounts of standard CaCO_3 series to react with hydrochloric acid. According to the volume of CO_2 produced, a working curve is drawn. After the CO_2 volume of the sample is measured, The working curve can be directly detected CaCO-3 content, and then converted into a sample of CaCO_3 percentage; the other method is based on