A new diffusive gradients in thin films technique (ZrO-AT DGT) with zirconium oxide, A-62 MP and T-42H resins containing in a single binding gel was developed for simultaneous measurement of nitrate (NO3-N), ammonium (NH4-N) and phosphate (PO4-P). The DGT uptake was found to be independent of pH variation from 3.2-8.7. Ionic strengths below 5, 10 and 750 mmol·L-1 NaCl did not affect DGT uptake of NH4-N, NO3-N and PO4-P, respectively. This new DGT was deployed in natural freshwater environments, with in situ measurements of the three nutrients found to be accurate. It ensured that rinsing the exposed surface of the DGT device at 3-day intervals can prevent biofouling. Additionally, a hybrid sensor comprising the novel DGT binding layer overlying an O2 planar optrode was tested in sediments to evaluate the dynamics of O2 and the three nutrients. Results showed that PO4-P and NO3-N fluxes decreased while fluxes of NH4-N increased under aerobic conditions. Nearly simultaneous variation in O2 and NO3-N was observed at the sediment-water interface (SWI) and transformation of NO3-N and PO4-P was found to be sensitively influenced by O2 dynamics.

中文翻译：

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混合传感器中包含的新DGT技术可同时测量铵，硝酸盐，磷和溶解氧。

开发了一种新的薄膜扩散技术（ZrO-AT DGT），其中氧化锆，A-62 MP和T-42H树脂包含在单个结合凝胶中，用于同时测量硝酸盐（NO3-N），铵盐（NH4- N）和磷酸盐（PO4-P）。发现DGT的摄取与3.2-8.7的pH变化无关。低于5、10和750mmol·L-1NaCl的离子强度分别不影响NH4-N，NO3-N和PO4-P的DGT吸收。这种新的DGT已部署在天然淡水环境中，对三种营养素进行了原位测量，结果是准确的。它确保以3天的间隔冲洗DGT设备的裸露表面可以防止生物积垢。另外，在沉积物中测试了包含覆盖在O2平面电极上的新型DGT结合层的混合传感器，以评估O2和三种营养素的动力学。结果表明，在有氧条件下，PO4-P和NO3-N的通量减少而NH4-N的通量增加。在沉积物-水界面（SWI）上观察到O2和NO3-N几乎同时变化，并且发现NO3-N和PO4-P的转化受到O2动力学的敏感影响。