论文部分内容阅读
测定土壤中氮的含量是分析土壤样品的主要项目之一。在生产中常用扩散法测定。该法选用的扩散吸收装置——扩散皿,有玻璃与塑料两种。使用这两种扩散皿,不易操作,扩散时间长,而且往往会因密封不好及胶水污染而造成分析误差,甚至分析失败,扩散皿还有滴定不方便、扩散温度不能太高的缺点。本装置采用玻璃扩散瓶,具有密封牢固、滴定方便、挥发扩散氮时温度可达70℃的优点。由于提高了扩散温度,在适当增加硼酸吸收液的条件下,扩散时间从24h缩短到3～4h,大大提高了工效,测定含氮范围50～400μg,完全可满足土壤中氮的测定要求。这种扩散吸收法测定氮的新装置——扩散瓶,具有推广应用的价值。
Determining nitrogen in soil is one of the major projects for analyzing soil samples. Commonly used in the production of diffusion measurement. The method of diffusion absorption device used - diffusion dish, there are two kinds of glass and plastic. The use of these two proliferation of dish, not easy to operate, the proliferation of a long time, and often due to poor sealing and glue pollution caused by the analysis of errors, and even analysis failed diffusion plate titration also inconvenient, the diffusion temperature can not be too high shortcomings. The device uses glass diffusion bottle, with a sealed, titration convenient, volatile nitrogen temperature up to 70 ℃ advantages. As the diffusion temperature is increased, the diffusion time is shortened from 24h to 3-4h under the condition of appropriate boric acid absorption liquid, which greatly improves the work efficiency. The determination of the nitrogen content range of 50-400μg can completely meet the requirement of determination of nitrogen in the soil. This diffusion absorption method for the determination of nitrogen new device - diffusion bottle, with the promotion and application of value.