Tracing the Dynamic Changes of Element Profiles by Novel Soil Porewater Samplers with Ultralow Disturbance to Soil-Water Interface

Yuan, Zhao-Feng, Gustave, Williamson, Bridge, Jonathan, Liang, Yi, Sekar, Raju ORCID: 0000-0002-1182-9004, Boyle, John ORCID: 0000-0002-1172-1079, Jin, Chen-Yu, Pu, Tong-Yao, Ren, Yu-Xiang and Chen, Zheng (2019) Tracing the Dynamic Changes of Element Profiles by Novel Soil Porewater Samplers with Ultralow Disturbance to Soil-Water Interface. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 53 (9). pp. 5124-5132.

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Official URL: http://dx.doi.org/10.1021/acs.est.8b05390

Abstract

In flooded soils, soil-water interface (SWI) is the key zone controlling biogeochemical dynamics. Chemical species and concentrations vary greatly at micro- to cm-scales. Techniques able to track these changing element profiles both in space and over time with appropriate resolution are rare. Here, we report a patent-pending technique, the Integrated Porewater Injection (IPI) sampler, which is designed for soil porewater sampling with minimum disturbance to saturated soil environment. IPI sampler employs a single hollow fiber membrane tube to passively sample porewater surrounding the tube. When working, it can be integrated into the sample introduction system, thus the sample preparation procedure is dramatically simplified. In this study, IPI samplers were coupled to ICP-MS at data-only mode. The limits of detection of IPI-ICP-MS for Ni, As, Cd, Sb, and Pb were 0.12, 0.67, 0.027, 0.029, and 0.074 μg·L<sup>-1</sup>, respectively. Furthermore, 25 IPI samplers were assembled into an SWI profiler using 3D printing in a one-dimensional array. The SWI profiler is able to analyze element profiles at high spatial resolution (∼2 mm) every ≥24 h. When deployed in arsenic-contaminated paddy soils, it depicted the distributions and dynamics of multiple elements at anoxic-oxic transition. The results show that the SWI profiler is a powerful and robust technique in monitoring dynamics of element profile in soil porewater at high spatial resolution. The method will greatly facilitate studies of elements behaviors in sediments of wetland, rivers, lakes, and oceans.

Item Type:	Article
Uncontrolled Keywords:	Arsenic, Water, Soil, Soil Pollutants, Environmental Monitoring
Depositing User:	Symplectic Admin
Date Deposited:	24 Apr 2019 09:24
Last Modified:	19 Jan 2023 00:53
DOI:	10.1021/acs.est.8b05390
Open Access URL:	https://doi.org/10.1021/acs.est.8b05390
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3038170