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Ferrioxalate-Polyoxometalate System as a New Chemical Actinometer

机译:草酸亚铁-多金属氧酸盐体系作为新型化学光度计

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摘要

A chemical actinometerthat employs an aqueous solution of ferrioxalate and polyoxometalate (POM: SiW_(12)O_(40)~(4-)) is proposed as a simple and fast method that quantifies the light intensity of UV radiation in the 300-390 nm range. As a modified ferrioxalate actinometer, illuminated ferrioxalate solution in the presence of POM generates CO_2 radical anions that lead to the production of blue-colored POM~-(SiW_(12)O_(40)~(5-)) whose concentration can be easily determined spectrophotometrically (by monitoring absorbance at 730 nm). Photoproduction rate of POM~- is linearly correlated with the light intensity. The measured quantum yields, Φ(POM~-), range 0.11-0.21 in the 300-390 nm region and is fairly constant around 0.18 in the 335-380 nm range, which makes this actinometry ideally suited for the rapid measurement of the light intensity in the UVA region such as in common black light sources. This alternative actinometry eliminates the postirradiation analytical procedure (which needs phenanthroline as a complexation reagent for Fe~(2+) and the subsequent color development) that is required in the standard ferrioxalate actinometry, and it enables the in-situ quantification of the light intensity in a simpler way by monitoring the formation of POM~- as a proxy indicator.
机译:提出了一种使用铁酸草酸盐和多金属氧酸盐(POM:SiW_(12)O_(40)〜(4-))水溶液的化学光度计,它是一种定量300-390 nm紫外光强度的简便快速方法。范围。作为一种改良的草酸铁盐光度计,在POM存在下受照的草酸铁盐溶液会生成CO_2自由基阴离子,导致产生蓝色POM〜-(SiW_(12)O_(40)〜(5-)),其浓度很容易用分光光度法测定(通过监测730 nm的吸光度)。 POM_-的光产生速率与光强度线性相关。测得的量子产率Φ(POM〜-)在300-390 nm范围内在0.11-0.21范围内,并且在335-380 nm范围内在0.18左右相当恒定,这使该光化学计量学非常适合快速测量光UVA区域(例如常见的黑色光源)中的强度。这种替代的光度测定法消除了标准铁酸草酸盐光度测定法所需的辐照后分析程序(需要菲咯啉作为Fe〜(2+)的络合试剂和随后的显色性),并且可以对光强度进行原位定量。通过监视POM_-的形成以更简单的方式作为代理指标。

著录项

  • 来源
    《Environmental Science & Technology》 |2007年第15期|5433-5438|共6页
  • 作者单位

    School of Environmental Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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