论文部分内容阅读
鈣、鎂的經典测定法是用草酸銨將鈣沉淀成草酸鈣(往往要再沉淀),再在沉淀鈣后的濾液中加磷酸氢二銨,將鎂沉淀成磷酸銨鎂(也往往需再沉淀)。前者常使之成CaCO_3、CaO或CaSO_4形式称重,或用高錳酸鉀法测定;后者則常燒成Mg_2P_2O_7形式称重,或用酸碱滴定法进行测定。虽然这是一个很准确的方法,但因进行沉淀的熟化和过濾,需要时間很長,不合快速分析的要求。由于对亞氨多羧型螯合剂(Complexone)及PM指示剂的研究工作的进展,現在已能准确而快速的对鈣和鎂进行测定。測定鈣、鎂总量是以爱利阿黑T(Eriochrome bla-
The classic measure of calcium and magnesium is the use of ammonium oxalate to precipitate calcium into calcium oxalate (often reprecipitated), and then the precipitated calcium after the filtrate plus diammonium phosphate, the magnesium precipitated into ammonium phosphate (also often required precipitation). The former often make it into the form of CaCO_3, CaO or CaSO_4, or potassium permanganate method; the latter is often calcined Mg_2P_2O_7 form of weighing, or acid-base titration method was measured. Although this is a very accurate method, it takes a long time due to the aging and filtration of the precipitate, which does not meet the requirements for rapid analysis. Due to advances in the research work on Complexone and PM indicators, the determination of calcium and magnesium is now accurate and rapid. Determination of calcium and magnesium is based on the total amount of Eli Black T (Eriochrome bla-