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盐渍土的盐性是决定盐渍土地区工程治理方案所必须考虑的一个重要因素。目前盐性鉴定的方法多局限于确定单一化合物晶体,但对于自然界常是两种以上化合物共存的情况,分析鉴定还不多见。本文针对试验配制的硫酸钠、氯化钠共存的水溶液在25℃和10℃等温条件下,采用正交偏光显微镜、差热分析仪和X—衍射仪,对其固相晶体进行鉴定识别并得到如下结论: 1.在硫酸钠、氯化钠固相共存的条件下,它们各自仍保留原化合物的部分物理、热学和光学特性,仍能采用差热分析、偏光显微镜、X—衍射的方法对其进行鉴别。 2.在正交偏光显微镜下,这两种化合物共存的固相晶型与单一化合物的固相晶型光学性质略有不同,但仍存有单一化合物晶型的部分光学性质,由此能定性地进行固相鉴别。 3.利用差热分析仪和X 衍射试验表明,这两种化合物共存的固相吸热峰值、衍射峰值与单一化合物固相吸热峰值和衍射峰值有所变化,但仍有其一定的变化规律并能以此定性和半定量的鉴别哪种化合物存在与否及两者的近似比例。
The salinity of saline soil is an important factor that must be considered in determining the project management plan of saline soil area. At present, the methods of salt identification are mostly limited to the determination of single compound crystals, but often two or more compounds coexist in nature. Analytical identification is rare. In this paper, for the experimental preparation of sodium sulfate, sodium chloride coexistence of aqueous solution at 25 ℃ and 10 ℃ isothermal conditions, using orthogonal polarizer, differential thermal analyzer and X-ray diffraction, the identification of solid-state crystals and get The following conclusions: 1. In the presence of sodium sulfate, sodium chloride solid phase conditions, they still retain some of the original compound physical, thermal and optical properties, can still be used differential thermal analysis, polarized light microscopy, X-ray diffraction method Its identification. Under orthogonally polarized light microscope, the solid phase of the coexistence of these two compounds is slightly different from the optical properties of the solid phase of the single compound, but there are still some optical properties of the single compound crystal, Solid-phase identification. The results of differential thermal analyzer and X-ray diffraction showed that the endothermic peak, the diffraction peak and the endothermic peak and the diffraction peak of the solid phase of the two compounds changed, but there were still some laws And can be qualitative and semi-quantitative identification of the existence of which compounds and the approximate proportion of the two.