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以碳酸鈣、氯化銨混合体,来熔化土壤中鉀矿物的方法[Lawrence Smith(史密司)法]是分析化学上通用了最久的方法之一。这个方法,显然具有分解作用比較彻底的优点,而土壤及岩石中某些原生鉀矿物又为一般酸液所不能溶解。分析化学家在最近20—30年以来,企图用各种混合酸液(特别是氟氫酸——过氯酸——硫酸)来代替史密司的冗长熔化步驟,但是在对待某些富有Al、Ti、Ba等合鉀矿物的土壤时,显然沒有达到完全分解的目的。因此,在土壤的全量分析时,习用了九十年之久的史密司方法,在今天还是被
The method of melting potash minerals in the soil with a mixture of calcium carbonate and ammonium chloride [Lawrence Smith] is one of the oldest methods in analytical chemistry. This method obviously has the advantage of more complete decomposition, and some of the native potassium minerals in the soil and rocks are not dissolved by the general acid solution. Analytical chemists have attempted to replace Smith’s lengthy melting steps with a variety of mixed acids (especially hydrofluoric acid-perchloric acid-sulfuric acid) over the last 20-30 years, but in the treatment of some Al , Ti, Ba and other potassium minerals in the soil, apparently did not achieve the purpose of complete decomposition. Therefore, the Smithian method, which has been used for ninety years in total soil analysis, is still today