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遇到固体试样时,除水溶性的外,都要进行酸溶样或碱熔样。所谓酸溶,就是用酸,如盐酸、硝酸、氢氟酸、高氯酸等强酸单独或混合进行直接溶样,使固体试样分解,变成透明的溶液。但往往有许多固体试样不可能全部被酸溶解,其残渣仍需用碱进行熔融。所谓碱熔,就是使用碳酸钠、碳酸钾、氢氧化钠或氢氧化钾等碱性熔剂,与试样按一定比例混合,置于坩埚中,在高温下熔融。 根据我们的经验,在碱熔样时,选用什么样的坩埚和哪种熔剂,应作具体分析,区别对待。一般实验室,都备有镍坩埚,因为它价格低廉,一次性投资较少,不需要进保
Encounter solid samples, in addition to water-soluble, have to acid-soluble or alkali-like samples. The so-called acid-soluble, is the acid, such as hydrochloric acid, nitric acid, hydrofluoric acid, perchloric acid and other strong acids alone or mixed samples were dissolved, the solid sample decomposition, into a transparent solution. But often there are many solid samples can not all be acid dissolved, the residue still need to use alkali melting. The so-called alkali melting, is the use of sodium carbonate, potassium carbonate, sodium hydroxide or potassium hydroxide and other alkaline flux, and the sample by a certain percentage of mixing, placed in a crucible, melting at high temperatures. According to our experience, in the alkali melting sample, what kind of crucible and which flux should be chosen should be analyzed specifically and differentiated. General laboratory, are equipped with nickel crucible, because it is inexpensive, less investment in one time, do not need to enter the insurance