Budasheva Hanna, Swapna Mohanachandran Nair Sindhu, Bratkič Arne, Korte Dorota
Laboratory for Environmental and Life Sciences, University of Nova Gorica, Vipavska 12, 5000 Nova Gorica, Slovenia.
National Institute of Biology-Marine Biology Station, Fornače 41, 6330 Piran, Slovenia.
Sensors (Basel). 2025 Jun 10;25(12):3643. doi: 10.3390/s25123643.
In this work, photothermal beam deflection spectrometry (BDS), combined with a passive sampling technique of diffusive gradients in thin film (DGT), is optimized to improve the method's sensitivity. The limit of detection (LOD) is then reduced by a factor of 2 (to the value of 20 nM). The functionality of the technique is compared for Chelex-100 (Ch-100) and suspended particulate reagent-iminodiacetate resin (SPR-IDA), used as binding resins in passive samplers. The absorption capacity of SPR-IDA resin is found to be less than 1 μM and far below that one of Chelex-100 resin (around 6 μM). The BDS technique is applied for determination of iron redox species concentration in sediment porewater. It is found that Fe in sediment porewater occurs both in Fe (0.073 μM) and Fe (0.095 μM) forms. The validation of the presented method reveals that the BDS technique ensures good repeatability, reproducibility, and reliability.
在本研究中，对结合了薄膜扩散梯度（DGT）被动采样技术的光热光束偏转光谱法（BDS）进行了优化，以提高该方法的灵敏度。检测限（LOD）降低了2倍（降至20 nM）。比较了作为被动采样器中结合树脂使用的螯合树脂100（Ch - 100）和悬浮颗粒试剂 - 亚氨基二乙酸树脂（SPR - IDA）的技术功能。发现SPR - IDA树脂的吸附容量小于1 μM，远低于螯合树脂100（约6 μM）。BDS技术用于测定沉积物孔隙水中铁氧化还原物种的浓度。发现沉积物孔隙水中的铁以Fe（0.073 μM）和Fe（0.095 μM）两种形式存在。所提出方法的验证表明，BDS技术具有良好的重复性、再现性和可靠性。
