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在土壤溶性盐化学分析中,粘土水浸提液的过滤是一件十分头痛的工作,特别在野外工作时往往无法进行。我们起初试用KNO_3和陈尚谨等推荐的Mg(NO_3)_2来凝聚土壤胶体,过滤速度大大加快,且对溶性盐阴离子的测定无显著影响,用于野外速测能获得满意的结果,但其最大缺点是无法测定溶性盐总量和阳离子。 土壤改良试验中,曾有应用高分子有机聚合物作为土壤团粒剂(Soil Conditioners)以增进土壤的团粒结构,其作用在于改变土壤的分散程度,使胶体凝聚。肮类高分子聚合物动物胶(明胶,Gelatin)是强亲水胶体,曾被广泛应用于SiO_2的化学分析中,使矽酸溶胶脱水凝聚。我们将其应用于粘土溶液的凝结上进行了一系列试验,粘重的土壤其过滤速度可加快20——30倍,并在溶性盐分析中获得了满意的结果。我们认为在掌握一定条件下,可推荐应用于野外或室内的土壤分析工作中。
In the chemical analysis of soil-soluble salts, filtration of clay water extracts is a very headache job, especially when working in the field. At first, we try to agglomerate soil colloids with the recommended Mg (NO_3) _2, such as KNO_3 and Chen Shangjin. The filtration speed is greatly accelerated and there is no significant effect on the determination of the soluble salt anions. However, Is unable to determine the total amount of soluble salts and cations. In the soil improvement experiment, polymer organic polymers have been used as soil conditioners to improve soil aggregate structure. The role of soil organic polymer is to change the degree of soil dispersion and to make the colloids cohesive. Dirty macromolecular polymer gelatin (gelatin) is a strong hydrophilic colloid, has been widely used in the chemical analysis of SiO2, the silicate sol dehydration condensation. We conducted a series of experiments on the coagulation of clay solutions. The viscous soils can be filtered 20-30 times more quickly and satisfactory results have been obtained in the analysis of soluble salts. We believe that under certain conditions, it can be recommended for soil analysis in the field or indoor.