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在0.5—1.2mol·L~(-1)HCl中,新显色剂DBN-偶氮胂与钍形成紫色二元络合物.λ_(max)=630nm,ε_((?)30nm)=1.11×10~5L·mol~(-1)·cm~(-1),0—0.8μgTh/ml遵守比尔定律。在有酒石酸、草酸存在下,重稀土(Ⅲ)和大量铀(Ⅵ)不干扰。测定矿石中n·10~(-3)％级的钍,相对标准偏差为6.16％。
In 0.5-1.2mol·L ~ (-1) HCl, a new binary complex of DBN-arsine with Thorium was formed. Λmax = 630nm, ε_ (30nm) = 1.11 × 10 ~ 5L · mol ~ (-1) · cm ~ (-1), 0-0.8μgTh / ml obeys Beer’s law. In the presence of tartaric acid and oxalic acid, heavy rare earth (Ⅲ) and a large amount of uranium (Ⅵ) do not interfere. Determination of ore n · 10 ~ (-3)% level of thorium, the relative standard deviation of 6.16%.