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1. Mobility of chromium in sediments dominated by macrophytes and cyanobacteria in different zones of Lake Taihu

Author:
Gong, Mengdan,   et al.   ; Fan, Xianfang; Ding, Shiming; Chen, Musong; Gao, Shuaishuai; Fu, Zhen; Wang, Yan; Zhang, Chaosheng;     Show all 8 Authors
Source:
The Science of the total environment 2019 v.666 pp. 994-1002
ISSN:
0048-9697
Subject:
Cyanobacteria; carbonates; chromium; dialysis; dissolved organic matter; ecological zones; ecotypes; iron oxides; lakes; macrophytes; manganese; manganese oxides; pollution; remediation; seasonal variation; sediments; summer; toxicity; winter
Abstract:
... To study the mechanisms of chromium (Cr) mobilization in sediments of lakes with different ecotypes, seasonal sampling was performed in the macrophyte-dominated East Taihu (MDET) and cyanobacteria-dominated Meiliang Bay (CDMB) in Lake Taihu. Concentrations of labile Cr(VI) and dissolved Cr were assessed using diffusive gradients in thin films (DGT) and high-resolution dialysis passive sampling dev ...
DOI:
10.1016/j.scitotenv.2019.02.299

2. Seasonal changes of lead mobility in sediments in algae- and macrophyte-dominated zones of the lake

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Ding, Shiming; Lin, Juan; Fu, Zhen; Tang, Wanying; Fan, Xianfang; Wang, Yan;     Show all 8 Authors
Source:
The Science of the total environment 2019 v.660 pp. 484-492
ISSN:
0048-9697
Subject:
adsorption; chemical species; dialysis; ecotypes; iron; lakes; lead; macrophytes; manganese; manganese oxides; models; organic matter; pollution; roots; seasonal variation; sediments
Abstract:
... This study examined lead (Pb) pollution in algae- and macrophytes-dominated sediments, using diffusive gradient in thin films (DGT) and dialysis (HR-Peeper) techniques. Lead pollution varied by season in the two different ecotype sediments. In the algae-dominated zone, the highest concentrations of DGT-labile Pb and dissolved Pb occurred in April and July, respectively. The reductive dissolution o ...
DOI:
10.1016/j.scitotenv.2019.01.010

3. Efficacy of dredging engineering as a means to remove heavy metals from lake sediments

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Ding, Shiming; Gao, Shuaishuai; Fu, Zhen; Tang, Wanying; Wu, Yuexia; Wang, Dan; Wang, Yan;     Show all 9 Authors
Source:
The Science of the total environment 2019 v.665 pp. 181-190
ISSN:
0048-9697
Subject:
algae; cadmium; copper; dialysis; dredging; heavy metals; lakes; leaching; lead; pollution control; sediments; surface water
Abstract:
... Dredging is used worldwide to remove polluted sediments from water bodies. However, the dredging efficacy remains hard to identify. Here, we studied the efficacy of dredging engineering as a means to remove Cu, Cd, and Pb from polluted lake sediments, after six years of completion. Dissolved metals and DGT-labile metals were quantified in the non-dredged and post-dredged sediments by high-resoluti ...
DOI:
10.1016/j.scitotenv.2019.02.057

4. Long-term effects of sediment dredging on controlling cobalt, zinc, and nickel contamination determined by chemical fractionation and passive sampling

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Ding, Shiming; Gao, Shuaishuai; Xu, Shiwei; Yang, Chenye; Wu, Yuexia; Wang, Dan; Wang, Yan;     Show all 9 Authors
Source:
Chemosphere 2019 v.220 pp. 476-485
ISSN:
0045-6535
Subject:
autumn; cobalt; dialysis; dredging; fractionation; long term effects; nickel; seasonal variation; sediment contamination; sediments; spring; summer; winter; zinc
Abstract:
... Studies of dredging effectiveness, especially the ones that last for several years, are scarce. In this study, we evaluated effectiveness of dredging performed for six years on controlling cobalt (Co), zinc (Zn), and nickel (Ni) contamination of sediments. High-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) methods were applied to analyze the non-dredged and post-dredgi ...
DOI:
10.1016/j.chemosphere.2018.12.138

5. Peak Chromium Pollution in Summer and Winter Caused by High Mobility of Chromium in Sediment of a Eutrophic Lake: In Situ Evidence from High Spatiotemporal Sampling

Author:
Gong, Mengdan,   et al.   ; Fan, Xianfang; Ding, Shiming; Chen, Musong; Gao, Shuaishuai; Fu, Zhen; Tsang, Daniel C. W.; Wang, Yan; Zhang, Chaosheng;     Show all 9 Authors
Source:
Environmental science & technology 2019 v.53 no.9 pp. 4755-4764
ISSN:
1520-5851
Subject:
anaerobic conditions; chromium; dialysis; dissolved organic matter; drinking; eutrophication; fisheries; laboratory experimentation; lakes; manganese; oxides; pollution; remediation; sampling; sediments; summer; water quality standards; winter; China
Abstract:
... To study the mechanisms of chromium (Cr) mobilization in sediments of eutrophic lakes, monthly sampling was performed in the Meiliang Bay of Lake Taihu, China, combined with laboratory experiments. High-resolution dialysis and diffusive gradients in thin film (DGT) sampling techniques were used. Results indicated that in July 2016 and January 2017, the concentrations of soluble Cr and DGT-labile C ...
DOI:
10.1021/acs.est.8b07060

6. High resolution spatiotemporal sampling as a tool for comprehensive assessment of zinc mobility and pollution in sediments of a eutrophic lake

Author:
Gong, Mengdan,   et al.   ; Jin, Zengfeng; Ding, Shiming; Sun, Qin; Gao, Shuaishuai; Fu, Zhen; Lin, Juan; Wang, Dan; Wang, Yan;     Show all 9 Authors
Source:
Journal of hazardous materials 2019 v.364 pp. 182-191
ISSN:
0304-3894
Subject:
adsorption; algae; algal blooms; dialysis; dissolved organic matter; eutrophication; fisheries; lakes; manganese; manganese oxides; pollution; risk; sediments; water quality; winter; zinc; China
Abstract:
... To assess zinc (Zn) pollution risk from sediments, this study investigated the monthly changes of dissolved Zn and labile Zn in sediment-overlying water profiles in a eutrophic bay (Meiliang Bay) of Lake Taihu (China) using high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) at a 4 mm vertical resolution. In February and March, Mn oxides reduction caused high concentra ...
DOI:
10.1016/j.jhazmat.2018.09.067

7. Long-term effectiveness of sediment dredging on controlling the contamination of arsenic, selenium, and antimony

Author:
Gong, Mengdan,   et al.   ; Sun, Qin; Ding, Shiming; Chen, Musong; Gao, Shuaishuai; Lu, Guanghua; Wu, Yuexia; Wang, Dan; Wang, Yan;     Show all 9 Authors
Source:
Environmental pollution 2019 v.245 pp. 725-734
ISSN:
0269-7491
Subject:
algae; antimony; arsenic; dialysis; sediment contamination; sediments; selenium
Abstract:
... This study assessed the effectiveness of dredging in controlling arsenic (As), selenium (Se), and antimony (Sb) contamination in sediments, by examining contaminant concentrations in sediments six years after dredging was completed. High-resolution diffusive gradients in thin films (DGT) and dialysis (HR-Peeper) techniques were used to monitor the concentrations of DGT-labile metalloids and solubl ...
DOI:
10.1016/j.envpol.2018.11.050

8. Simultaneous measurements of arsenic and sulfide using diffusive gradients in thin films technique (DGT)

Author:
Gong, Mengdan,   et al.   ; Xu, Lv; Sun, Qin; Ding, Shiming; Zhang, Chaosheng;     Show all 5 Authors
Source:
Environmental geochemistry and health 2018 v.40 no.5 pp. 1919-1929
ISSN:
0269-4042
Subject:
adsorption; arsenic; arsenites; coprecipitation; environmental monitoring; gels; hydrogen peroxide; ionic strength; iron; lakes; oxidation; pH; sampling; sediments; sodium hydroxide; sulfates; zirconium; China
Abstract:
... Diffusive gradients in thin films technique (DGT) is a dynamically passive sampling technique which has been applied increasingly to the environmental monitoring field. In the preliminary period, the DGT with zirconium hydroxide-silver iodide as the binding phase (ZrO-AgI DGT) has been developed for the determination of sulfide (S(II)). On this basis, this paper developed its determination method ...
DOI:
10.1007/s10653-017-9968-8

9. Submillimeter-scale heterogeneity of labile phosphorus in sediments characterized by diffusive gradients in thin films and spatial analysis

Author:
Gong, Mengdan,   et al.   ; Meng, Yuting; Ding, Shiming; Chen, Musong; Wang, Yan; Fan, Xianfang; Shi, Lei; Zhang, Chaosheng;     Show all 8 Authors
Source:
Chemosphere 2018 v.194 pp. 614-621
ISSN:
0045-6535
Subject:
autocorrelation; eutrophication; geographic information systems; organic matter; phosphorus; seasonal variation; sediments; summer; temperature; winter
Abstract:
... Sediments have a heterogeneous distribution of labile redox-sensitive elements due to a drastic downward transition from oxic to anoxic condition as a result of organic matter degradation. Characterization of the heterogeneous nature of sediments is vital for understanding of small-scale biogeochemical processes. However, there are limited reports on the related specialized methodology. In this st ...
DOI:
10.1016/j.chemosphere.2017.11.178

10. Successful control of internal phosphorus loading after sediment dredging for 6years: A field assessment using high-resolution sampling techniques

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Cui, Jingzhen; Lin, Juan; Ding, Shiming; Ren, Mingyi; Tsang, Daniel C.W.;     Show all 7 Authors
Source:
The Science of the total environment 2018 v.616-617 pp. 927-936
ISSN:
0048-9697
Subject:
algae; algal blooms; autumn; dialysis; eutrophication; iron; models; phosphorus; sampling; sediment-water interface; sediments; spring; summer; winter
Abstract:
... The effectiveness of sediment dredging for the control of internal phosphorus (P) loading, was investigated seasonally in the eutrophic Lake Taihu. The high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were used to measure the concentrations of soluble Fe(II) and soluble reactive P (SRP) as well as DGT-labile Fe/P in the non-dredging and post-dredging sedi ...
DOI:
10.1016/j.scitotenv.2017.10.227

11. Internal phosphorus loading from sediments causes seasonal nitrogen limitation for harmful algal blooms

Author:
Gong, Mengdan,   et al.   ; Ding, Shiming; Chen, Musong; Fan, Xianfang; Qin, Boqiang; Xu, Hai; Gao, ShuaiShuai; Jin, Zengfeng; Tsang, Daniel C.W.; Zhang, Chaosheng;     Show all 10 Authors
Source:
The Science of the total environment 2018 v.625 pp. 872-884
ISSN:
0048-9697
Subject:
algal blooms; dialysis; eutrophication; iron; nitrogen; phosphorus; pollution load; sediment-water interface; sediments; spatial distribution
Abstract:
... It is proposed that the internal loading of phosphorus (P) from sediments plays an important role in seasonal nitrogen (N) limitation for harmful algal blooms (HABs), although there is a lack of experimental evidence. In this study, an eutrophic bay from the large and shallow Lake Taihu was studied for investigating the contribution of internal P to N limitation over one-year field sampling (Febru ...
DOI:
10.1016/j.scitotenv.2017.12.348

12. Simultaneous measurements of cations and anions using diffusive gradients in thin films with a ZrO-Chelex mixed binding layer

Author:
Gong, Mengdan,   et al.   ; Wang, Yan; Ding, Shiming; shi, Lei; Xu, Shiwei; Zhang, Chaosheng;     Show all 6 Authors
Source:
Analytica chimica acta 2017
ISSN:
0003-2670
Subject:
absorption; analytical chemistry; antimony; arsenic; cadmium; cations; chromium; cobalt; copper; freshwater; gels; hydrogen peroxide; ionic strength; iron; lead; manganese; molybdenum; nickel; nitric acid; oxyanions; pH; seawater; sediments; selenium; sodium hydroxide; vanadium; zinc
Abstract:
... A new method for the simultaneous measurements of eight cations [Fe(II), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), and Pb(II)] and eight oxyanions [P(V), V(V), Cr(VI), As(III)/As(V), Se(VI), Mo(VI), Sb(V), and W(VI)] was established in this study using the diffusive gradients in thin films (DGT) technique with an improved ZrO-Chelex binding gel. The binding kinetics of each analyte in a mixe ...
DOI:
10.1016/j.aca.2017.04.007

13. Fine-scale bioturbation effects of tubificid worm (Limnodrilus hoffmeisteri) on the lability of phosphorus in sediments

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Ding, Shiming; Liu, Ling; Wang, Yan; Xing, Xigang; Wang, Dan; Zhang, Chaosheng;     Show all 8 Authors
Source:
Environmental pollution 2016 v.219 pp. 604-611
ISSN:
0269-7491
Subject:
Limnodrilus hoffmeisteri; adsorption; bioturbation; burrows; dialysis; ingestion; iron; phosphorus; sediments
Abstract:
... This study investigated the effects of tubificid worm bioturbation on the lability of phosphorus (P) in microcosm sediments. High-resolution dialysis (HR-Peeper) and two types of diffusive gradients in thin films (DGT) (Zr-oxide DGT and ZrO-Chelex DGT) were used to measure soluble P and Fe, and labile P and Fe at a millimeter spatial scale. The worm bioturbation promoted P release (up to 511% of t ...
DOI:
10.1016/j.envpol.2016.06.023

14. Diffusion characteristics of agarose hydrogel used in diffusive gradients in thin films for measurements of cations and anions

Author:
Gong, Mengdan,   et al.   ; Wang, Yan; Ding, Shiming; Xu, Shiwei; Xu, Weimin; Zhang, Chaosheng;     Show all 6 Authors
Source:
Analytica chimica acta 2016 v.945 pp. 47-56
ISSN:
0003-2670
Subject:
agarose; analytical chemistry; anions; antimony; arsenic; cadmium; cations; chromium; cobalt; copper; crosslinking; diffusivity; electrostatic interactions; freshwater; gels; hydrocolloids; ionic strength; iron; lead; manganese; molybdenum; nickel; pH; polyacrylamide; pyruvic acid; seawater; selenium; sodium nitrate; storage time; temperature; zinc
Abstract:
... The agarose hydrogel has been increasingly used as a diffusive layer in diffusive gradients in thin films (DGT) measurements. However its diffusive characteristics have not been examined in detail. In this study, the performance of agarose gel was tested in DGT measurements of eight cations (Fe(II), Mn(II), Co(II), Ni(II), Cu(II), Zn(II), Pb(II), and Cd(II)) and eight anions (P(V), As(V), Cr(VI), ...
DOI:
10.1016/j.aca.2016.10.003

15. New holder configurations for use in the diffusive gradients in thin films (DGT) technique

Author:
Gong, Mengdan,   et al.   ; Ding, Shiming; Wang, Yan; Zhang, Liping; Xu, Lv; Zhang, Chaosheng;     Show all 6 Authors
Source:
RSC advances 2016 v.6 no.91 pp. 88143-88156
ISSN:
2046-2069
Subject:
arsenic; cadmium; feces; gels; lead; pressing; sediments; seepage; soil
Abstract:
... This study reports two new holder configurations that can be used in the diffusive gradients in thin films (DGT) technique, including a dual-mode holder and a new flat-type holder. The dual-mode holder can be assembled as a piston type, similar to the existing one for deployments in solution/water. It can also be assembled to form a hollow cylinder (open cavity) with 10 mm depth and 20 mm diameter ...
DOI:
10.1039/c6ra19677b

16. Simultaneous Measurements of Eight Oxyanions Using High-Capacity Diffusive Gradients in Thin Films (Zr-Oxide DGT) with a High-Efficiency Elution Procedure

Author:
Gong, Mengdan,   et al.   ; Ding, Shiming; Xu, Di; Wang, Yanping; Wang, Yan; Li, Yangyang; Zhang, Chaosheng;     Show all 7 Authors
Source:
Environmental Science & Technology 2016 v.50 no.14 pp. 7572-7580
ISSN:
1520-5851
Subject:
antimony; arsenic; binding capacity; chromium; ferrihydrite; freshwater; gels; hydrogen peroxide; ionic strength; molybdenum; oxyanions; pH; seawater; sediment contamination; selenium; zirconium
Abstract:
... A zirconium oxide binding gel-based diffusive gradients in thin films (Zr-oxide DGT) was developed for simultaneous measurements of P(V), As(V), Cr(VI), Mo(VI), Sb(V), Se(VI), V(V), and W(VI). All of the oxyanions were rapidly bound to Zr-oxide gel with differences in binding affinity. The eight bound oxyanions were successfully recovered by one-step elution using a mild reagent of 0.2 M NaOH–0.5 ...
DOI:
10.1021/acs.est.6b00206

17. Kinetics of phosphorus release from sediments and its relationship with iron speciation influenced by the mussel (Corbicula fluminea) bioturbation

Author:
Gong, Mengdan,   et al.   ; Chen, Musong; Ding, Shiming; Liu, Ling; Xu, Di; Tang, Hao; Zhang, Chaosheng;     Show all 7 Authors
Source:
The Science of the total environment 2016 v.542 pp. 833-840
ISSN:
0048-9697
Subject:
Corbicula fluminea; bioturbation; dialysis; iron; models; mussels; oxides; oxygen; phosphorus; sediments
Abstract:
... The effects of bivalve (Corbicula fluminea) bioturbation on the lability of phosphorus (P) in sediments were investigated. The high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were employed to obtain soluble and labile P/Fe profiles at a vertical resolution of 2 and 1mm, respectively. The bivalve bioturbation increased the concentrations of soluble reacti ...
DOI:
10.1016/j.scitotenv.2015.10.155