Retention of Heavy Metals in the Post '96 Flood Sediment Layer Deposited in the Saguenay River, Quebec, Canada

Cd, Cu and Zn mobility in contaminated sediments from an infiltration basin colonized by wild plants: The case of Phalaris arundinacea and Typha latifolia

Water Science & Technology ◽

10.2166/wst.2011.161 ◽

2011 ◽

Vol 64 (1) ◽

pp. 255-262 ◽

Cited By ~ 9

Author(s):

M. Saulais ◽

J. P. Bedell ◽

C. Delolme

Keyword(s):

Heavy Metals ◽

Organic Matter ◽

Typha Latifolia ◽

Phalaris Arundinacea ◽

Acetate Buffer ◽

Wild Plants ◽

Sediment Layer ◽

Strongly Correlated ◽

Infiltration Basin ◽

Cu And Zn

Infiltration basins are shallow reservoirs in which stormwater is temporarily collected in order to reduce water volume in downstream networks. The settling of stormwater particles leads to a contaminated sediment layer. Wild plants can colonize these basins and can also play a role on the fate of heavy metals either directly by their uptake or indirectly by modification of physico-chemical characteristics of the sediment and therefore by modification of the mobility of heavy metals. The aim of this study, carried out in a vegetated infiltration basin, is to assess Cd, Cu and Zn mobility in two zones colonized by different species, Phalaris arundinacea and Typha latifolia. The study was carried out using three single chemical extractions: CaCl2 for the exchangeable phase, acetate buffer for the acido-soluble fraction and diethylenetriamine-pentaacetic acid (DTPA) for the fraction associated to the organic matter. Zn and Cd are mainly associated to carbonated and organic matter phases of the sediment. Moreover, acetate buffer-extractable Zn contents are strongly correlated to carbonates content in the sediment. DTPA-extractable Cu contents are strongly correlated with organic carbon sediment contents. We have also noted that extractable contents were significantly different between both zones whatever the metal.

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Heavy metal fractionation studies in tidal sediment cores in the clam farms from Tan Thanh commune, Go Cong dong district, Tien Giang province, Vietnam

Journal of Vietnamese Environment ◽

10.13141/jve.vol10.no2.pp99-106 ◽

2018 ◽

Vol 10 (2) ◽

pp. 99-106

Author(s):

Mai Lan Nguyen

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Solid Phase ◽

Sediment Cores ◽

Water Soluble ◽

Sediment Layer ◽

Chemical Fractions ◽

Fe Oxides ◽

Step Procedure ◽

Icp Ms

Results are presented from a study of the distribution of heavy metals in chemical fractions in tidal sediment cores at 4 sample stations inside the baby clam breeding plain, inside the harvested clam breeding plain, and on the frontier between the plains in the clam farms in Tan Thanh, Go Cong Dong, Tien Giang, Vietnam. The partitioning of metals among the compartments of the sediment solid phase was investigated indirectly by selective sequential extractions of a seven-step procedure adapted from Leleyter and Probst. The chemical forms were labeled according to the targeted geochemical compartments during each extraction step include water-soluble, exchangeable, bound to carbonates, bound to Mn oxides, bound to amorphous Fe oxides, bound to crystalline Fe oxides, associated with organics and residual. The heavy metal content (Co, Zn, As, Cd, Hg, Pb, Cr) in chemical fractions in sediment cores sliced in three depths (0-20 cm, 20-40 cm and 40 – 60cm) was analyzed by ICP-MS. The highest concentration of heavy metals was found in the oxidable fraction. The data more than 60% shows an important role of organic matters in the oxidable condition at the surficial sediment layer. The heavy metal concentrations depend on the depth of sediment show that clam’s digestive activity or the decomposition of tissue and shell of clams possibly affects the content of heavy metals. Bài báo giới thiệu các kết quả nghiên cứu về sự phân bố kim loại nặng dưới các dạng liên kết khác nhau trong các mẫu lõi trầm tích tại các bãi nuôi nghêu giống, bãi nuôi nghêu sau khi đã thu hoạch, vàranh giới giữa các bãi nuôi nghêu tại xã Tân Thành, huyện Gò Công Đông, tỉnh Tiền Giang, Việt Nam. Các dạng pha liên kết bao gồm: 1.pha hòa tan; 2. pha trao đổi; 3.liên kết với các bô nát; 4. liên kết với Man gan ô xít; 5. liên kết với sắt ô xít vô định hình; 6. liên kết với sắt ô xít dạng tinh thể; 7. liên kết với thành phần hữu cơ và; 8. Phần bã rắn. Trong các kim loại nặng (KLN) được phân tích, hàm lượng Zn và Hg vượt quá tiêu chuẩn cho phép QCVN 43:2012/BTNMT lần lượt từ 1,12 – 3,53 và 24,58 – 171,96 lần. Hàm lượng KLN tồn tại nhiều nhất dưới dạng liên kết với các thành phần có khả năng ô xi hóa với tỉ lệ hơn 60% chỉ ra vai trò của thành phần hữu cơ trong điều kiện ô xi hóa tại lớp trầm tích tầng mặt. Sau các thành phần có khả năng ôxi hóa, các KLN hiện diện trong phần bã rắn nhiều hơn trong các pha khác. Sự có mặt của KLN trong phần bã rắn chỉ ra mức độ ô nhiễm của hệ thống sông: càng nhiều phần trăm KLN có mặt trong phần bã rắn, càng ít ô nhiễm trong môi trường bởi phần bã rắn này liên quan đến các thành phần không thể bị rửa tách. Sự phụ thuộc theo độ sâu của hàm lượng kim loại nặng đưa ra khả năng về sự ảnh hưởng của hoạt động tiêu hóa và quá trình phân hủy của nghêu lên hàm lượng kim loại nặng.

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Heavy metal pollution status in the sediment layer in World Heritage Site: Indian Sundarbans estuarine region

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/56/4/9815 ◽

2018 ◽

Vol 56 (4) ◽

pp. 474

Author(s):

Shankhadeep Chakraborty ◽

Abhijit Mitra

Keyword(s):

Heavy Metals ◽

Geoaccumulation Index ◽

World Heritage ◽

World Heritage Site ◽

Sediment Layer ◽

Indian Sundarbans ◽

Lead And Cadmium ◽

Heritage Site ◽

Estuarine Region ◽

Copper Lead

Heavy metals have a great ecological significance due to their toxicity and accumulative behavior. The geoaccumulation index (Igeo) in 12 stations in the UNESCO declared World Heritage Site- Indian Sundarbans estuarine region (i.e Kakdwip, Harinbari, Chemaguri, Sagar South, Lothian island, Jambu island, Frasergunge, Gosaba, Chotomollakhali, Bali island, Sajnekhali and Bagmara) were calculated for the year 2016. The sediment pollution was investigated by following the concentration of 3 heavy metals namely copper, lead and cadmium. Atomic Absorption Spectrophotometer (AAS) was used for analysis. According to the geoaccumulation index (Igeo) the results of all the 10 stations were analyzed and discussed in details.

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Sampling and analysis of the air-water interface with SEM and EDS of microlayers

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100157000 ◽

1989 ◽

Vol 47 ◽

pp. 1004-1005

Author(s):

Randall W. Smith ◽

John Dash

Keyword(s):

Heavy Metals ◽

Surface Microlayer ◽

Surface Films ◽

Water Interface ◽

Physical Processes ◽

Infrared Spectroscopic Analysis ◽

Eds Analysis ◽

Air Water Interface ◽

Significant Area ◽

Bulk Chemical

The structure of the air-water interface forms a boundary layer that involves biological ,chemical geological and physical processes in its formation. Freshwater and sea surface microlayers form at the air-water interface and include a diverse assemblage of organic matter, detritus, microorganisms, plankton and heavy metals. The sampling of microlayers and the examination of components is presently a significant area of study because of the input of anthropogenic materials and their accumulation at the air-water interface. The neustonic organisms present in this environment may be sensitive to the toxic components of these inputs. Hardy reports that over 20 different methods have been developed for sampling of microlayers, primarily for bulk chemical analysis. We report here the examination of microlayer films for the documentation of structure and composition.Baier and Gucinski reported the use of Langmuir-Blogett films obtained on germanium prisms for infrared spectroscopic analysis (IR-ATR) of components. The sampling of microlayers has been done by collecting fi1ms on glass plates and teflon drums, We found that microlayers could be collected on 11 mm glass cover slips by pulling a Langmuir-Blogett film from a surface microlayer. Comparative collections were made on methylcel1ulose filter pads. The films could be air-dried or preserved in Lugol's Iodine Several slicks or surface films were sampled in September, 1987 in Chesapeake Bay, Maryland and in August, 1988 in Sequim Bay, Washington, For glass coverslips the films were air-dried, mounted on SEM pegs, ringed with colloidal silver, and sputter coated with Au-Pd, The Langmuir-Blogett film technique maintained the structure of the microlayer intact for examination, SEM observation and EDS analysis were then used to determine organisms and relative concentrations of heavy metals, using a Link AN 10000 EDS system with an ISI SS40 SEM unit. Typical heavy microlayer films are shown in Figure 3.

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