硅酸盐中三氧化二铝的测定,通常用氟盐取代,EDTA容量法完成,硅酸盐单矿物中三氧化二铝的测定,由于受样品用量的限制,取样量少,易引入较大之误差,如用稀标准液,则导致终点变色不敏锐。用分光光度法测定铝,较常用的是埃铬菁R(ECR),铬天青S(CAS)等试剂,灵敏度虽较高,但选择性较差。尤其是络合物的吸光度,受溶液pH的影响很大,分析 Silicate in the determination of aluminum oxide, usually replaced by fluoride salt, EDTA volume method is completed, the determination of alumina in silicate single mineral, due to the limited amount of sample, sampling less easy to introduce larger The error, such as the use of dilute standard solution, the end result discoloration is not sensitive. Spectrophotometric determination of aluminum, the more commonly used chromium cyanine R (ECR), chrome azure S (CAS) and other reagents, although the sensitivity of higher, but less selective. In particular, the absorbance of the complex, greatly affected by the pH of the solution, analysis