利用分光光度法研究了试剂5-(5-碘-2-吡啶偶氮)-2,4-二氨基甲笨(5-I-PADAT)与铱(Ⅲ)的显色反应.结果表明,在HAc-NaAc缓冲介质(pH 5.5～6.8)中,铱(Ⅲ)与5-I-PADAT形成1∶2的稳定络合物,以强酸酸化,可转化为另一种具有较高吸收特性的质子化型体,灵敏度显著提高.在1.2 mol/L H2SO4溶液中,络合物呈现分别位于542 nm和584 nm的两个吸收峰,表观摩尔吸光系数为ε584=5.9×104 L·mol-1·cm-1.铱含量在0.03～1.0μg/mL范围内符合比尔定律.方法应用于催化剂中铱的测定,测定值与参考值相符,相对标准偏差为0.52％.
参考文献
| [1] | Colodner D C;Boyle E A;Edmond J M .Determination of rhenium and platinum in natural waters and sediments,and iridium in sediments by flow injection isotope dilution inductively coupled plasma mass spectrometry[J].Analytical Chemistry,1993,65(10):1419-1425. |
| [2] | Nehring F;Jacob D E;Barth M G et al.Laser-ablation ICP-MS analysis of siliceous rock glasses fused on an iridium strip heater using MgO dilution[J].Microchimica Acta,2008,160(1-2):153-163. |
| [3] | Hossain K Z;Camagong C T;Honjo T .Extraction of iridium(Ⅳ) from hydrochloric acid media with crown ether in chloroform,and its determination by ICPAES[J].Fresenius'Journal of Analytical Chemistry,2001,369(06):543-545. |
| [4] | Oddone M;Genova N;Meloni S .An accurate procedure for the derermination of low levels of iridium in standard reference materials by neutron activation analysis[J].Journal of Radioanalytical and Nuclear Chemistry,1986,99(02):325-330. |
| [5] | Morcelli C P R;Figueiredo A M G .Determination of iridium at sub ng @ g-1 levels in geological materials by RNAA[J].Journal of Radioanalytical and Nuclear Chemistry,2000,244(03):619-621. |
| [6] | 韩权,阎宏涛.催化近场激光热透镜光谱法测定痕量铱[J].分析化学,2003(05):608-610. |
| [7] | Gureva P F;Savvin S B .Specrophotometric methods for determining noble metals[J].Journal of Analytical Chemistry,2002,57(11):980-996. |
| [8] | 段颖,吴瑞林,金娅秋.贵金属元素光度分析法进展[J].冶金分析,2000(05):37-45,11. |
| [9] | 杨乡珍.铱的光度分析进展[J].湿法冶金,2005(02):112-116. |
| [10] | 韩权,霍燕燕,张亚利,杨晓慧,田丽.5-（5-碘-2-吡啶偶氮）-2,4-二氨基甲苯的合成及其与钴显色反应的研究[J].化学试剂,2010(09):824-826,850. |
| [11] | 杨晓慧,霍燕燕,赵亮,韩权,田丽.5-（5-碘-2-吡啶偶氮）-2,4-二氨基甲苯分光光度法测定微量钌（Ⅱ）[J].分析试验室,2010(05):110-113. |
| [12] | 孙家娟,刘彬,王晓玲,杨连利.铱（Ⅲ）与2-（5-溴-2-吡啶偶氮）-5-二甲氨基苯胺的显色反应及其应用[J].分析测试学报,2003(03):51-53. |
| [13] | 周艳梅;王贵方;张光 .5-(5-硝基-2-吡啶偶氮)-2,4-二氨基甲苯分光光度法测定微量铱(Ⅲ)的研究[J].冶金分析,1998,18(03):14-16. |
| [14] | 王勇;杨瑞丽;杨合情 等.新型吡啶偶氮试剂质子化行为的分光光度法研究[J].陕西师范大学学报(自然科学版),1996,24(01):68-73. |
| [15] | Shibata S;Furukawa M;Goto K .Spectrophotometric studies on the reaction of cobalt with 4-(2-pyridylazo)-1,3-diaminobenzene and its halogen derivatires[J].Analytica Chimica Acta,1974,71:85-91. |
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