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苯基乙酸能从pH4～6.5的介质中定量沉淀钪。由于在pH5及以上介质中析出的沉淀易粘附皿壁,故推荐莅pH4～5之间作沉淀。沉淀剂须过量很多,始能定量沉淀,至少需理论量(以克分子计)35倍,多至87倍亦无妨碍。已试验0.6～29毫克氧化钪的测定,均能得满意结果。沉淀系苯基乙酸钪,其分子式经元素分析证实为Sc(C_6H_5CH_2COO)_3。沉淀的热分解曲线见图2,说明此沉淀既可干燥(约120℃),又可灼烧为氧化钪(650～800℃)后称重。
Phenylacetic acid can quantitatively precipitate scandium from a medium of pH 4-6.5. Due to precipitation in pH5 and above media is easy to stick to the wall, it is recommended to do between pH4 ~ 5 precipitation. Precipitant to be a lot of excess, began to quantify the precipitation, at least the theoretical amount (in terms of molecular weight) 35 times, up to 87 times without any hindrance. Has been tested 0.6 ~ 29 mg of scandium oxide determination, can get satisfactory results. Precipitation Department of scandium phenylacetate, the molecular formula confirmed by elemental analysis of Sc (C_6H_5CH_2COO) _3. The thermal decomposition curve of the precipitate is shown in Fig. 2, indicating that the precipitate can be dried (about 120 ° C) and scorched to scandium oxide (650-800 ° C) and weighed.