NMT历史上的今天丨ENVIRON EXP BOT 铵营养与Cd胁迫关系 文章发表

NMT历史上的今天

2017年10月10日，扬州大学王赪胤利用NMT在Sensors and Actuators B上发表了标题为Voltammetric  simultaneous ion flux measurements platform for Cu2+, Pb2+ and Hg2+   near rice root surface: Utilizing carbon nitride heterojunction film   modified carbon fiber microelectrode的研究成果。

英文摘要

Developing an available analysis platform for   simultaneous heavy metal ion flux measurement at trace level is urgent   for understanding the mechanisms of phytoremediation.

Herein, oxygenous functionalized carbon nitride   nanosheets assembled porous films on multi-walled carbon nanotube formed  nano frameworks was firstly prepared on a carbon fiber disk   microelectrode by an advanced drop-casting method. The as-prepared   electrode shows low detection limit (The 1.0 × 10?13 mol L?1 for Cu2+,   1.8 × 10?11 mol L?1 for Pb2+ and 8.0 × 10?12 mol L?1 for Hg2+),   acceptable linear range (6.6 × 10?12 ～ 8.5 × 10?6 mol L?1 for Cu2+, 8.1 ×  10?10 ～ 8.5 × 10?6 mol L?1 for Pb2+ and 2.2 × 10?11 ～ 8.5 × 10?6 mol   L?1 for Hg2+) and fine selectivity in simultaneous determination. The   improved accumulation ability of modifier is attributed to improved   conductivity and the porous morphology of the film, which may improve   useful rate of the chelation groups.

Based on the as-prepared electrode and a stepper   motor, the voltammetric platform for simultaneous heavy metal ion flux   measurement at trace level is fabricated for the first time. This   platform can be utilized for mechanism investigation of simultaneous   metal uptake on the surface of rice roots at trace level.

中文摘要（谷歌机翻）

为了了解植物修复的机理，迫切需要开发一种可用于同时进行痕量重金属离子通量测量的分析平台。

在此，首先通过先进的滴铸法在碳纤维盘微电极上制备了在多壁碳纳米管形成的纳米框架上组装多孔膜的含氧官能化的氮化碳纳米片。所制备的电极显示出较低的检测限（对于Cu2+为1.0×10-13  mol L-1，对于Pb2+为1.8×10-11 mol L-1，对于Hg2+为8.0×10-12 mol   L-1），可以接受线性范围（Cu2+为6.6×10-12?8.5×10-6 mol L-1，Pb2+为8.1×10-10?8.5×10-6   mol L-1和2.2×10-11?8.5×10-6 mol   Hg2+的L-1）和同时测定的优良选择性。改性剂积累能力的提高归因于膜的导电性和多孔形态的改善，这可以提高螯合基团的有用率。

基于准备好的电极和步进电机，首次制造了用于痕量水平同时重金属离子通量测量的伏安平台。该平台可用于研究水稻根部表面微量金属同时摄取的机理。

Figure 4. (A) Photograph of the VPSIFM in  determination of heavy metal ions near root surface of rice. (B) Testing  positions of the voltammetric ion fluxes measurements near the root  surface of the rice. Measurement of fluxes (outward positive) of Cu2+,  Pb2+ and Hg2+ (error bars mean the standard error of 5 duplicate tests)  across the root tips of rice, utilizing the voltammetric platform for  simultaneous heavy metal ion flux measurements P-CN_T60/MWCNT/CFE. Ion  flux measurement of (C) Cu2+, (D) Pb2+ and (E) Hg2+ in extracted  solution at high concentration level. Ion flux measurements of (F)  Cu2+,(G) Pb2+ and (H) Hg2+ in extracted solution at low concentration  level. (Black and white)