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在土壤盐分的研究中,硫酸根的测定,目前采用较多的方法有重量法、EDTA容量法、阳离子交换树脂法和硫酸钡比浊法等。这些方法中,有些虽然结果较准确,但对设备要求较高,手续也较麻烦;有些方法虽然手续简单,对设备要求不高,但误差较大。J·S·Fritze与M·Q·Fruland早在1953年就提出了以茜素红—S为指示刑,用BaCl_2直接滴定硫酸根的方法,但至今未被广泛采用。本人针对可能影响本法测定结果的诸因素进行了研究,以提出一个简单、迅速和误差较小的方法。经过对多种土壤测定检验,证明本方法是可行的。 一、研究的依据和内容
In the study of soil salinity, the determination of sulfate is currently used in more methods, such as gravimetric method, EDTA volumetric method, cation exchange resin method and barium sulfate turbidimetric method. Some of these methods, although the results are more accurate, require higher equipment and procedures are more troublesome; although some procedures are simple, less demanding on the equipment, but the error is larger. As early as 1953, J.S. Fritze and M.Q. Fruland proposed alizarin red-S as a method of directing titration of sulfate with BaCl 2, but so far it has not been widely used. I have studied a number of factors that may affect the determination of this Law to propose a simple, rapid and less error-prone method. After a variety of soil testing to prove that this method is feasible. First, the basis and content of the study