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首页> 外文期刊>Environmental Science & Technology >High-Performance Planar pH Fluorosensor for Two-Dimensional pH Measurements in Marine Sediment and Water
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High-Performance Planar pH Fluorosensor for Two-Dimensional pH Measurements in Marine Sediment and Water

机译：高性能平面pH值氟传感器，用于海洋沉积物和水中的二维pH测量

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摘要

A new plate fluorosensor foil was developed for two-dimensional pH measurement in marine sediments and overlying waters.The fluorescent dye 8-hydrdxy-1,3,6-pyrenetrisulfonic acid trisodium salt (HPTS) was covalently linked onto a transparent poly(vinyl alcohol) membrane backed by polyester sheet.Both excitation and emission bands of the immobilized HPTS showed large red shifts in comparison to HPTS in free solution.The ratio of fluorescence emission intensities at 540 nm following successive excitation at 506 and 428 nm was pH-sensitive and correlated with pH changes from 5.5 to 8.6.These properties are robust and insensitive to factors such as intensity of light source,temperature,and oxygen concentration.The plate sensor responded rapidly (<2 min),reversibly,and with high precision to pH changes in solution and in sediment.The stability of the sensor was also tested by continually changing the pH between 6 and 8.Performance of the sensor did not vary after >200 pH cycles.Furthermore,the sensor foil retained its original properties after continuous exposure to natural marine sediment for 2 months.The plate optode has been successfully used to measure two-dimensional pH distributions in intertidal flat and subtidal sediment.Images are readily obtained with inexpensive light-emitting diode (LED) excitation and commercial-grade digital cameras with typical pixel resolution of approx 50 X 50 mum over areas > 150 cm~2.
机译：开发了一种新的板式氟传感器箔，用于在海洋沉积物和上层水域中进行二维pH测量。荧光染料8-羟基1,3,6-吡咯烷磺酸三钠盐（HPTS）共价连接到透明的聚乙烯醇上与游离溶液中的HPTS相比，固定化HPTS的激发和发射带都显示出较大的红移。在506和428 nm连续激发后，540 nm处的荧光发射强度比对pH敏感，并且与pH值从5.5到8.6的变化相关。这些特性坚固且对光源强度，温度和氧气浓度等因素不敏感。平板传感器对pH值变化的响应迅速（<2分钟），可逆且具有高精度。此外，还通过在6至8之间不断改变pH值来测试传感器的稳定性。在200次以上的pH循环后，传感器的性能没有变化。传感器箔在连续暴露于天然海洋沉积物中2个月后仍保持其原始性能。平板光电二极管已成功用于测量潮间带和潮间带沉积物中的二维pH分布。使用廉价的发光二极管可轻松获得图像（ LED）激发和商业级数码相机，在大于150 cm〜2的区域内，典型像素分辨率约为50 X 50 mum。

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  • 来源
    《Environmental Science & Technology》 |2005年第22期|p.8906-8911|共6页
  • 作者

    QINGZHI ZHU; ROBERT C.ALLER; YANZHEN FAN;

  • 作者单位

    Marine Sciences Research Center,Stony Brook University,Stony Brook,New York 11794-5000;

    Marine Sciences Research Center,Stony Brook University,Stony Brook,New York 11794-5000;

    Marine Sciences Research Center,Stony Brook University,Stony Brook,New York 11794-5000;

  • 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;
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