Transfer Mechanism, Uptake Kinetic Process, and Bioavailability of P, Cu, Cd, Pb, and Zn in Macrophyte Rhizosphere Using Diffusive Gradients in Thin Films,Environmental Science & Technology

当前位置： X-MOL 学术 › Environ. Sci. Technol. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Transfer Mechanism, Uptake Kinetic Process, and Bioavailability of P, Cu, Cd, Pb, and Zn in Macrophyte Rhizosphere Using Diffusive Gradients in Thin Films
Environmental Science & Technology ( IF 11.4 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acs.est.7b01578
Shengrui Wang _{1,

2,

3} , Zhihao Wu _{2,

3} , Jun Luo ₄

Affiliation

The transfer-uptake-bioavailability of phosphorus (P), Cu, Cd, Zn, and Pb in rhizosphere of Zizania latifolia (ZL) and Myriophyllum verticiilaturn (MV) cultivated in rhizoboxes in Lake Erhai (China) is evaluated by DGT (diffusive gradients in thin films) technique. DGT induced fluxes in sediments (DIFS) model reveals that resupply ability (r), liable pool size in sediment solid (k_d), kinetic parameter (k_–1), or response time (T_c) control the diffusion-resupply characters of P and Cu (standing for four metals) in rhizosphere interface. The linear fitting curves of element content in ZL or MV roots (C_root) against DGT (C_DGT), porewater (C₀), or sediment concentration demonstrate that C_root for five elements can be predicted by C_DGT more effectively than the other methods. (I) DOC (dissolved organic carbon) in porewater controlled by OM (organic matter) in solid plus pH for Cu and Cd or (II) DOP/DTP ratio in porewater (between dissolved organic P and dissolved total P) for P controlled by Fe-bound P and OM in solid, can affect phytoavailability in rhizosphere. They lead to (I) the larger slope (s) and the linear regression coefficient (R²) in the first part than those for the complete fitting curve (ZL or MV root against C_DGT(Cu) or C₀(Cu) and MV root against C_DGT(Cd)) or (II) the outliers above or below the fitting curve (ZL root (P) against C₀(P) or C_DGT(P)) and the larger R² without outliers. DGT–rhizobox–DIFS should be a reliable tool to research phytoremediation mechanism of macrophytes.

更新日期：2018-01-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南

全部期刊列表>>