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(一)引言 目前,测定土壤中水分含量的方法,通常按照苏联国家标准(6379—52)进行。把秤量好的试样放入干燥箱中,在102—105℃温度下,烘干到恒重为止,两次重量之差即为土壤中水分的含量。快速测定方法,则按照苏联国家标准(6963—54)进行,方法是取定量试样在130—150℃的烘箱内加热,5—10分钟后进行测定。此法虽然快速,但由于温度不易控制,同时,部分试样发生分解和氧化作用,致使结果降低。
(A) Introduction At present, the method for determining the moisture content in soil is usually carried out in accordance with the national standard of the Soviet Union (6379-52). The weighing sample into the oven, at 102-105 ℃ temperature, drying to constant weight so far, the difference between the two weights is the soil moisture content. Rapid determination of the method, then in accordance with the Soviet Union National Standard (6963-54), the method is to take quantitative samples in 130-150 ℃ oven heating, 5-10 minutes after the determination. Although this method is fast, but the temperature is not easy to control, at the same time, part of the sample decomposition and oxidation, resulting in reduced results.