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本文应用碘绿作显色剂,萃取分光光度法测定微量钽。用苯萃取氟钽酸-碘绿缔合物。其最大吸收波长为632毫微米。水溶液中钽含量在0～30微克Ta_2O_5/10毫升范围内,符合比尔定律。选择性和重现性良好。苯层中氟钽酸-碘绿缔合物的表观克分子吸收系数ε632毫微米为9.8×10~4。本法灵敏度:水相中0.02微克Ta_2O_5/毫升。就可得0.01吸光度读数。应用本法分析了纯二氧化钛和标准钢样,标准回收实验表明,误差一般不超过±5％。
In this paper, iodine green as a reagent, extraction spectrophotometric determination of trace tantalum. Fluoro tantalate - Iodine green association with benzene extraction. The maximum absorption wavelength of 632 nm. The aqueous solution of tantalum in the range of 0 ~ 30 micrograms Ta_2O_5 / 10 ml, in line with Bill’s law. Selectivity and reproducibility are good. In the benzene layer, the apparent molecular absorption coefficient ε632 nm of fluorotantalate-iodine green association is 9.8 × 10 -4. Sensitivity of this Law: 0.02 micrograms Ta_2O_5 / ml in the aqueous phase. You can get 0.01 absorbance readings. Pure titanium dioxide and standard steel samples were analyzed by this method. The standard recovery experiments show that the error is not more than ± 5%.