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快速容量法测定煤灰成分是以氢氧化钠作熔剂,沸水浸取熔块,再以酸处理制成试液。采用氟硅酸钾容量法测定SiO_2;EDTA络合直接滴定法(以磺基水杨酸为指示剂)测定Fe_2O_3;以PAN为指示剂,以标准硫酸铜溶液返滴法测铝和钛含量;再以EDTA直接滴定法测定Ca~(2+)和Mg~(2+)。本法经能源部化学专业标准化技术委员会审定,并已报请能源部批准作为部颁标准。兹将该法介绍于后。一、试液的制备准确称取在105～110℃已烘了2h的灰
Fast-volume method for the determination of ash composition is sodium hydroxide as a flux, boiling water leaching frit, and then treated with acid made of test solution. The method of potassium fluosilicate volumetric method for the determination of SiO_2; EDTA complexometric titration (sulfosalicylic acid as an indicator) determination of Fe_2O_3; PAN as an indicator, with standard copper sulfate solution back drop method for the determination of aluminum and titanium content; The EDTA direct titration method was used to determine Ca 2+ and Mg 2+. This Law was approved by the Ministry of Energy Chemistry Standardization Technical Committee and submitted to the Ministry of Energy for approval as a ministerial standard. This law is introduced below. First, the preparation of the test solution accurately weighed at 105 ~ 110 ℃ has been baked 2h ash