Influences of hydrological regime on heavy metal and salt ion concentrations in intertidal sediment from Chongming Dongtan, Changjiang River estuary, China
Influences of hydrological regime on heavy metal and salt ion concentrations in intertidal sediment from Chongming Dongtan, Changjiang River estuary, China
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水文情势对长江口崇明东滩潮间带沉积物重金属和盐离子浓度的影响
DOI：
10.1007/s00343-017-0191-3
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发表时间：
2017-04
影响因子：
--
通讯作者：
Yang Jin
中科院分区：
文献类型：
--
作者：
Zhao Jiale;Gao Xiaojiang;Yang Jin
长江口滩涂长期以来一直被围垦用于农业用途，在这种成壤改造过程中的水文条件对其成功开发具有重要意义。本研究以长江口崇明东滩表层沉积物为研究对象，研究水文管理对孔隙水中重金属和盐离子浓度的影响，以及围垦过程中重金属的化学形态分布。我们进行了一系列实验，模拟了三种不同的水文状况：永久淹水(R1)、交替的五天干湿周期(R2)和连续田间持水量(R3)。我们的结果显示，对于R1和R2，孔隙水中重金属和盐离子之间的皮尔逊相关系数很好。尤其是孔隙水中的盐离子浓度在所有三个区域都有所下降，但R2的降幅最大。在这个R2实验中，孔隙水中Fe和Mn的周期性浓集模式发生了变化，而Cr、Cu、Pb和Zn的周期性浓集模式没有变化。在任何情况下，镍的分馏和任何金属的残余量都没有明显的变化。在R1区，沉积物中重金属(铬、铜、锌、铅)的可还原部分减少，而酸可提取部分增加。在R2中，铬、铜、锌、铅的酸浸提态和可还原态都有所下降，铜的可氧化态也有所下降。这些数据表明，交替的水文制度可以降低沉积物中的盐度和重金属的有效性。
The tidal flat along the Changjiang (Yangtze) River estuary has long been reclaimed for the agricultural purposes, with the prevailing hydrological conditions during such pedogenic transformations being of great importance to their successful development. In this study, samples of surface sediment from Chongming Dongtan, situated at the mouth of the Changjiang River estuary, were collected and analyzed in order to understand how hydrological management can influence the concentrations of heavy metals and salt ions in pore water, and chemical fractionation of heavy metals during the reclamation process. We performed a series of experiments that simulated three different hydrological regimes: permanent flooding (R1), alternative five-day periods of wetting and drying (R2), continuous field capacity (R3). Our results exhibited good Pearson correlations coefficients between heavy metals and salt ions in the pore water for both R1 and R2. In particular, the concentrations of salt ions in the pore water decreased in all three regimes, but showed the biggest decline in R2. With this R2 experiment, the periodic concentration patterns in the pore water varied for Fe and Mn, but not for Cr, Cu, Pb and Zn. Neither the fractionation of Ni nor the residual fractions of any metals changed significantly in any regime. In R1, the reducible fractions of heavy metals (Cr, Cu, Zn and Pb) in the sediment decreased, while the acid extractable fractions increased. In R2, the acid extractable and the reducible fractions of Cr, Cu, Zn and Pb both decreased, as did the oxidizable fraction of Cu. These data suggest that an alternating hydrological regime can reduce both salinity and the availability of heavy metals in sediments.
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DOI：
--
发表时间：
2013
期刊：
--
影响因子：
--
作者：
R. Balint;C. Orbeci;G. Nechifor;Marinela Plesca
通讯作者：
R. Balint;C. Orbeci;G. Nechifor;Marinela Plesca
DOI：
10.1080/03067319308027619
发表时间：
1993-01-01
影响因子：
2.6
作者：
URE, AM;QUEVAUVILLER, P;GRIEPINK, B
通讯作者：
GRIEPINK, B
DOI：
10.1016/j.scitotenv.2006.07.041
发表时间：
2007-07
期刊：
The Science of the total environment
影响因子：
--
作者：
M. Speelmans;D. Vanthuyne;K. Lock;F. Hendrickx;L. G. Du;F. Tack;Colin R. Janssen
通讯作者：
M. Speelmans;D. Vanthuyne;K. Lock;F. Hendrickx;L. G. Du;F. Tack;Colin R. Janssen
DOI：
10.1002/ep.670190312
发表时间：
2000-09
期刊：
Environmental Progress
影响因子：
--
作者：
T. Nedwed;D. Clifford
通讯作者：
T. Nedwed;D. Clifford
影响因子：
8.7
作者：
D. Norton-Brandão;S. M. Scherrenberg;J. V. van Lier
通讯作者：
D. Norton-Brandão;S. M. Scherrenberg;J. V. van Lier