Nitrite plays a critical role in a variety of nitrification and denitrification processes in the nitrogen cycle. Due to the high surface energy, tendency to aggregate, and poor conductivity, current nitrite ZnS-based sensing platform could not meet the need of on-site nitrite detection in smart agriculture. In order to address these issues, the carboxylated carbon nanotube (CNT) was introduced to reduce the surface energy and prevented aggregation of ZnS, while ZnS-carboxylated CNT (ZnS-CNT) composite also provided excellent electrochemical conductivity. Furthermore, the introduction of phase transition BSA (PTB) created a three-dimensional porous conductive matrix without interfering with the mass transfer process of nitrite. The resulting sensing platform exhibited a linear detection range of 10 nM to 0.4 mM for nitrite, with a detection limit of 0.73 nM. And this sensing platform had the excellent antifouling ability to direct detection nitrite in real soil suspension. In addition, the sensing platform demonstrated remarkable resistance to interferences from pH variations, microbial presence, and organic pollutants that usually present in soil environment. Therefore, on-site detection of nitrite ions in soil environment was realized no needing complex pretreatments.

中文翻译：

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基于相变 BSA 和共价耦合稳定过渡 ZnS-CNT 的 3D 多孔导电基质，用于土壤防污和亚硝酸盐现场检测


亚硝酸盐在氮循环中的各种硝化和反硝化过程中起着至关重要的作用。目前基于ZnS的亚硝酸盐传感平台由于其表面能高、易聚集、导电性差等缺点，无法满足智慧农业现场亚硝酸盐检测的需求。为了解决这些问题，引入羧基碳纳米管（CNT）来降低表面能并防止ZnS聚集，同时ZnS-羧基碳纳米管（ZnS-CNT）复合材料还提供优异的电化学导电性。此外，相变 BSA (PTB) 的引入创建了三维多孔导电基质，而不干扰亚硝酸盐的传质过程。由此产生的传感平台对亚硝酸盐的线性检测范围为 10 nM 至 0.4 mM，检测限为 0.73 nM。该传感平台具有优异的防污能力，可直接检测真实土壤悬浮液中的亚硝酸盐。此外，该传感平台对土壤环境中通常存在的pH变化、微生物存在和有机污染物的干扰具有显着的抵抗力。因此，无需复杂的预处理，实现了土壤环境中亚硝酸根离子的现场检测。