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本文报告用2-噻吩甲酰丙酮作沉淀剂测定铍的重量法。在酸度为pH5·1—6·1的溶液中,铍可以定量地沉淀为2-噻吩甲酰丙酮铍,Be(C_8H_7O_2S)_2。热分解曲线表明,此沉淀能稳定至160℃,可作为称衡形式。用于测定1—8毫克铍,均能获得满意的结果。钙、镁、锰及少量磷酸根离子不妨碍测定。有EDTA存在时,铝、铁(Ⅲ)、铜(Ⅱ)、铀(Ⅵ)、钍(Ⅳ)等离子也不干扰。应用本法测定了绿柱石中的铍,结果良好。
This paper reports the gravimetric determination of beryllium using 2-thio-acetylacetone as a precipitant. Beryllium can be quantitatively precipitated as beryllium 2-thienoyl acetonate, Be (C_8H_7O_2S) _2, in a solution of pH5 · 1-6 · 1. Thermal decomposition curve shows that the precipitate can be stabilized to 160 ℃, can be used as a weighing form. For the determination of 1-8 mg beryllium, can get satisfactory results. Calcium, magnesium, manganese and a small amount of phosphate ions do not hinder the determination. In the presence of EDTA, aluminum, iron (Ⅲ), copper (Ⅱ), uranium (Ⅵ), thorium (Ⅳ) ions do not interfere. This method was applied to the determination of beryllium in beryl and the results were good.