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本文提出了在碱性溶液中以CaCO_3-Fe(OH)_3共沉淀富集或用50%乙酰丙酮-氯仿(pH5～6)萃取铝基体进行分离,并以丁醇-氯仿(1+4)为溶剂在0.25NNaOH介质中用GBHA为显色刺萃取光度测定铝中微量钙的方法。富集回收率达85～90%,显色萃取率近90%。当确定GBHA浓度为0.06%、两相体积各为10毫升、以2公分皿、555nm波长测定吸光度时,测得表观克分子吸收系数为12000～15000,对0～10微克钙线性关系良好。本文对GBHA法测定钙的萃取溶剂作了选择,对本法的灵敏度、准确性有所改善。
In this paper, we propose a method for the separation of aluminum matrix with CaCO_3-Fe (OH) 3 coprecipitation in alkaline solution or the extraction of aluminum matrix with 50% acetylacetone-chloroform (pH5 ~ 6) As a solvent in 0.25NNaOH media with GBHA as color prick extraction spectrophotometric determination of trace calcium in aluminum. Enrichment recovery rate of 85 ~ 90%, color extraction rate of nearly 90%. When the GBHA concentration was determined to be 0.06% and the two-phase volumes were 10 ml each, absorbance was measured at a wavelength of 2 cm dish and at a wavelength of 555 nm. The apparent molar absorptivity was 12000 to 15000 and good linearity for 0 to 10 μg calcium. In this paper, GBHA method for the determination of calcium extraction solvent has been selected, the sensitivity and accuracy of this Law has been improved.