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首页> 外文期刊>Marine Chemistry >Planar fluorescence sensors for two-dimensional measurements of H_2S distributions and dynamics in sedimentary deposits
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Planar fluorescence sensors for two-dimensional measurements of H_2S distributions and dynamics in sedimentary deposits

机译：平面荧光传感器，用于二维测量沉积物中H_2S的分布和动力学

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Planar fluorescence sensors have been developed for measuring two-dimensional hydrogen sulfide (H_2S) distributions in marine sediments by using pyronin Y (PY) as a novel H_2S indicator. Sensing foils were prepared by non-covalently immobilizing PY in ethyl cellulose polymer membranes on transparent polyester sheets, and coating them with gas permeable silicone. Fluorescence from the sensors emitted at 567 nm (excitation at 554 nm) is inversely correlated to H_2S concentration in solution. Two primary sensor modifications, Ml and M2, were used. The Ml sensor shows an excellent linear response versus H_2S in the range of non-detectable (nd) to 3150 μmol/1 with a detection limit of 40 μmol/1 H_2S (3σ), and it can be utilized for high concentration H_2S measurement. The M2 sensor has a dynamic working dynamic range of nd-125 μmol/1 H_2S with a detection limit of 4 μmol/1 (3σ) and can be used to detect low level H_2S in samples. The response time (t_(90)) and recovery time (R_(90)) of the Ml sensor are ~60 and 30 s. respectively, and for the M2, ~15 s. These fluorosensors are only sensitive to H_2S rather than ionic sulfide and bisulfide species, and their performance is independent of temperature and other dissolved gases such as oxygen, CO_2. NH_3 and N_2. No interferences from major ions and trace elements in sediment porewater were observed due to the protection of the fluorophore by the silicone membrane. The sensors are simple, stable, and semi-reversible (reversible for M2) for extended periods, and have been successfully used to measure 2-dimensional H_2S distributions and dynamics in sulfidic salt marsh sediments with a theoretical pixel resolution of -50 × 50 μm. Complex heterogeneous H_2S distributions in marine sediments and previously undocumented time-dependent biogeochemical reaction dynamics associated with both inhabited and abandoned biogenic structures were readily revealed.
机译：已经开发了平面荧光传感器，通过使用吡喃酮Y（PY）作为新型H_2S指示剂来测量海洋沉积物中的二维硫化氢（H_2S）分布。通过将PY非共价固定在透明聚酯片材上的乙基纤维素聚合物膜中，然后在其上涂以透气性有机硅来制备传感箔。传感器在567 nm（554 nm激发）处发出的荧光与溶液中H_2S浓度成反比。使用了两个主要传感器修改M1和M2。 M1传感器在不可检测的（nd）至3150μmol/ 1的范围内显示出与H_2S极好的线性响应，检测极限为40μmol/ 1 H_2S（3σ），可用于高浓度H_2S测量。 M2传感器的动态工作动态范围为nd-125μmol/ 1 H_2S，检测极限为4μmol/ 1（3σ），可用于检测样品中的低水平H_2S。 M1传感器的响应时间（t_（90））和恢复时间（R_（90））为〜60和30s。对于M2，分别为〜15 s。这些氟传感器仅对H_2S敏感，对离子型硫化物和二硫化物不敏感，其性能与温度和其他溶解气体（例如氧气，CO_2）无关。 NH_3和N_2。由于有机硅膜对荧光团的保护，未观察到沉积物孔隙水中主要离子和微量元素的干扰。该传感器简单，稳定且半可逆（对于M2可逆）具有较长的时间，并且已成功用于测量硫化盐沼沉积物中的二维H_2S分布和动力学，理论像素分辨率为-50×50μm 。很容易揭示出海洋沉积物中复杂的异质H_2S分布以及先前未记录的与居住和废弃的生物成因结构相关的时间依赖性生物地球化学反应动力学。

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