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The thallium content in Al Tl alloys,thallides and thallium sulfate are selectively determined by chelato metry with aminourea hydrochloride used as the reasling agent. 本文提出以鹽酸氨基脲作釋放劑,選擇性螯郃滴定法測定鉛鉈郃金、鉈化物和硫酸鉈中的鉈含量。