论文部分内容阅读
近年来几种新的钍显色剂相继应用,使分光光度法测钍取得了显著的进展。本文研究了新试剂对甲基二溴偶氮胂与钍反应的分光光度性能。在1.2N盐酸溶液中,试剂与钍形成灵敏度高且十分稳定的有色配合物,其摩尔吸光系数为1.34×10~5L·mol~(-1)·Cm~(-1)。试液中共存Ca(Ⅱ)7mg,Mg(Ⅱ)20mg,Al(Ⅲ)20~*mg,Fe(Ⅲ)15~*mg,Bi(Ⅲ)17mg, Mn(Ⅱ )15~*mg,Cu(Ⅱ)15mg,Ni(Ⅱ)10~*mg,Co(Ⅱ)20~*mg,Pb(Ⅱ)2mg,Cd(Ⅱ)10~*mg,SC(Ⅲ)4mg,RE0.004mg,Ti(Ⅵ)1.8mg,Zr(Ⅳ)0.04mg,Si(Ⅵ)16~*mg,V(Ⅴ)1.0mg,Sn(Ⅳ)10~*mg,U(Ⅳ)1.5~*mg,Cr(Ⅵ)1.5mg,Mo(Ⅵ)20mg,WO_4~(2-)6.0mg,PO_4~(3-)200~*mg,H_2C_2O_4 500~*mg,酒石酸500~*mg,柠檬酸400mg,NH_4F10mg(~*表示未做到最大限量)不干扰钍的测
In recent years, several new thorium developers have been applied, the spectrophotometric determination of thorium made significant progress. In this paper, the spectrophotometric performance of the new reagent for the reaction of methyldibromoarsenazo with thorium was studied. In 1.2N hydrochloric acid solution, the reagent and thorium form a highly sensitive and stable colored complex with a molar absorption coefficient of 1.34 × 10 -5 L · mol -1 cm -1. In the test solution, Ca (Ⅱ) 7mg, Mg (Ⅱ) 20mg, Al (Ⅲ) 20 ~ * mg, Fe Ⅲ 15mg * (Ⅱ) 10 ~ * mg, Co (Ⅱ) 20 ~ * mg, Pb (Ⅱ) 2mg, Cd (Ⅱ) 10 ~ * mg, SC (Ⅲ) 4mg, RE0.004mg, Cr (Ⅵ), Cr (Ⅵ), Cr (Ⅵ), Cr (Ⅵ) 20 mg of WO (VI) 6.0 mg of PO 4 3- 200 mg · mg -1 of H 2 C 2 O 4 500 mg mg of tartaric acid 400 mg of citric acid 10 mg of NH 4 F Did not achieve the maximum limit) does not interfere with thorium measurement