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化学学报
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化学学报 ›› 1980, Vol. 38 ›› Issue (5): 433-440. 上一篇    下一篇

论文

铌(V)和钽(V)的过氧络合物在分析化学中的应用Ⅰ.酒石酸对利用Ta(V)-H2O2-PAR三元络合物直接分光光度测定钽的影响

罗宗铭   

  1. 广东矿冶学院分析化学系
  • 投稿日期:1978-10-31 发布日期:2013-06-03

APPLICATIONS OF NIOBIUM(Ⅴ) AND TANTALUM(Ⅴ) PEROXIDE COMPLEX IN ANALYTICAL CHEMISTRY Ⅰ.THE EFFECT OF TARTARIC ACID ON DIRECT SPECTROPHOTOMETRIC DETERMINATION OF TANTALUM VIA TERNARY TA(Ⅴ)-H2O2-PAR COMPLEX

LUO ZONG-MING   

  1. Chemical Analysis Department of Institute of Mining and Metallurgy, Guang Dong Province
  • Received:1978-10-31 Published:2013-06-03

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本文研究了酒石酸、柠檬酸、草酸及氟化铵对Ta(V)-H2O2-PAR三元络合物的影响.在这些辅助络合剂中,发现只有适量酒石酸才能使络合物在较宽的pH范围(4～7)内稳定存在,并有利于钽的分光光度测定.提出了在酒石酸介质中,于pH5.6,在波长530nm处,用Ta(V)-H2O2-PAR三元络合物分光光度测定钽的方法.在选定的条件下,用CyDTA、NTA及六偏磷酸钠作掩蔽剂,对18种阳离子的干扰进行了研究.钽在0～9微克/毫升范围内符合比尔定律.在pH5.6及波长530nm处测定,钽的三元络合物的克分子消光系数为4.1×104.用等克分子系列法、平衡移动法、三元相图法及电泳法测得络合物组成为[Ta(O2)2PAR]-.计算得到表观稳定常数为5.9×105.此法用于矿石中钽的测定,操作简便易于掌握,其精确度在±7%以内.

The effect of tartaric acid,citric acid,oxalic acid and ammonium fluoride on the formation of the ternary Ta(V)-H2O2-PAR complex has been studied in detail.In these complexing agents,it has been observed that only suitable addition of tartaric acid is advantageous to speotrophotometrio measurement of Ta(Ⅴ),because it would increase the stability of complex ranging from pH4 to 7.A method for speotrophoto-metric determination of tantalum in tartaric acid medium at wavelength 530 nm and pH 5.6 with ternary Ta(V)-H2O2-PAR complex is recommended.