Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 52, Issue 24, Pages 14140-14148Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.8b03671
Keywords
-
Categories
Funding
- Major Science and Technology Program for Water Pollution Control and Treatment [2017ZX07302-001]
- National Natural Science Foundation of China [41771271]
- Fundamental Research Funds for the Central Universities [021114380105]
Ask authors/readers for more resources
The speciation of selenium (Se) controls its fate and behavior, determining both its biological and environmental activities. However, in situ monitoring of Se-IV presents a significant challenge due to its sensitivity to redox change. A novel diffusive gradients in thin films (DGT) technique containing mercapto-, amino-bifunctionalized SBA15 mesoporous silica nanoparticles was developed and evaluated in a series of laboratory and field deployment tests. The SBA-DGT exhibited a linear accumulation of Se-IV (r(2) > 0.997) over a 72 h deployment, with negligible accumulation of Se-VI(<5%). Consistent prediction of Se-IV occurred within ionic strength and pH ranges of 0.1-200 mmol L-1 and 3.6-8, respectively. Limits of detection of the SBA-DGT were 0.03 mu g Se-IV L-1, which is suitable for natural waters. Moreover, the properties of the bifunctionalized SBA15 enable it to be fabricated within ultrathin (0.05 mm) gel layers for use in conjunction with 02 planar optode imaging. This new sandwich sensor technology with SBA-DGT was validated by mapping the two-dimensional distribution of Se-IV and oxygen simultaneously in rice rhizospheres. This study shows that SBA-DGT provides a selective measurement of Se-IV in situ, demonstrating its potential for both environmental monitoring and as a research tool for improving our understanding of Se biogeochemical processes.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available