scholarly journals Distribution and sources of n-alkanes in surface sediments of Taihu Lake, China

2016 ◽  
Vol 42 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Yunlong Yu ◽  
Yuanyuan Li ◽  
Zhigang Guo ◽  
Hua Zou
Keyword(s):  
Surface Sediment ◽  
Surface Sediments ◽  
Taihu Lake ◽  
Higher Plants ◽  
Complex Mixture ◽  
Dry Weight ◽  
Short Chain ◽  
Sediment Samples ◽  
Total Concentrations ◽  
Long Chain

Abstract The last study on n-alkanes in surface sediments of Taihu Lake was in 2000, only 13 surface sediment samples were analysed, in order to have a comprehensive and up-to-date understanding of n-alkanes in the surface sediments of Taihu Lake, 41 surface sediment samples were analyzed by GC-MS. C10 to C37 were detected, the total concentrations of n-alkanes ranged from 2109 ng g−1 to 9096 ng g−1 (dry weight). There was strong odd carbon predominance in long chain n-alkanes and even carbon predominance in short chain n-alkanes. When this finding was combined with the analysis results of wax n-alkanes (WaxCn), carbon preference index (CPI), unresolved complex mixture (UCM), hopanes and steranes, it was considered that the long chain n-alkanes were mainly from terrigenous higher plants, and that the short chain n-alkanes mainly originated from bacteria and algae in the lake, compared with previous studies, there were no obvious anthropogenic petrogenic inputs. Terrestrial and aquatic hydrocarbons ratio (TAR) and C21−/C25+ indicated that terrigenous input was higher than aquatic sources and the nearshore n-alkanes were mainly from land-derived sources. Moreover, the distribution of short chain n-alkanes presented a relatively uniform pattern, while the long chain n-alkanes presented a trend that concentrations dropped from nearshore places to the middle of lake.

Distribution of sterols and the sources of pollution in surface sediments of Ulungur lake, Xinjiang

2013 ◽  
Vol 67 (10) ◽  
pp. 2342-2349 ◽  
Author(s):  
Xiaorui Yao ◽  
Jianjiang Lu ◽  
Zilong Liu ◽  
Dan Ran ◽  
Yating Huang
Keyword(s):  
Surface Sediment ◽  
Surface Sediments ◽  
Domestic Sewage ◽  
Plant Sterols ◽  
Ecological Environment ◽  
Sediment Samples ◽  
Sources Of Pollution ◽  
Inland Lake ◽  
Great Pressure ◽  
Total Concentrations

Domestic sewage discharged into lakes brings great pressure to the ecological environment. This study selected sediment from an inland lake as a research object to evaluate pollution of the environment. Eight sterols were used to evaluate the content of pollutants, while the ratios of sterols were used as the index to analyze the sources of pollution. The correlations were analyzed between sterols and total organic carbon (TOC), salinity and particle size. The distribution and composition of sterol compounds were determined in 12 surface sediment samples collected from Ulungur lake. The total concentrations of detected sterols in the sediments ranged from 1.3 to 36.3 μg/g.dw. The most abundant sterol detected was β-sitosterol (STI) with average concentrations of 2.6 μg/g.dw, followed by cholesterol (CHOE), stigmasterol (STIG) and stigmastanol (STAN). The concentration of coprostanol (COP) was between 0.03 and 1.66 μg/g.dw. Through correlation analysis, it was found that there was a significant correlation between fecal sterols and plant sterols. So the plant sterols shall not be neglected in evaluating the sources of pollution for their impact to identify the fecal sources. The study suggests that the composition and distribution of sterols in surface sediment provide useful information for environmental contamination monitoring and assessment in the inland lake.

Estimation of Organochlorine Pesticides and Dioxin-Like PCBs in Surface Sediments from Baihua Lake

2011 ◽  
Vol 233-235 ◽  
pp. 2988-2993 ◽  
Author(s):  
Jin Luo ◽  
Li Ya Fu ◽  
Ji Wei Hu ◽  
Zheng Wen Yu ◽  
Chun Liu ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Polychlorinated Biphenyls ◽  
Organochlorine Pesticides ◽  
Surface Sediment ◽  
Surface Sediments ◽  
Dry Weight ◽  
Selected Ion Monitoring ◽  
Sediment Samples ◽  
Sampling Locations

The concentration of eight organochlorine pesticides (OCPs) and twelve dioxin-like polychlorinated biphenyls (dl-PCBs) were estimated in nine surface sediment samples from Baihua Lake. Gas chromatography with mass spectrometry (GC-MS) was applied using selected ion monitoring (SIM) mode for the quantification of the OCPs and for the qualification of the dl-PCBs. The results showed that the concentrations of DDTs varied from 1.04 to 36.74 ng g-1(dry weight) in these sampling locations, and that of HCHs was in the range from 0.57 to 8.90 ng g-1. In addition, PCB167 and PCB169 were detected in several sediment samples.

The Correlation of Sediments Characteristics with Organochlorine Pesticides (OCPs) in Surface Sediments of Nansi Lake, China

2013 ◽  
Vol 726-731 ◽  
pp. 926-930 ◽  
Author(s):  
Gui Zhai Zhang ◽  
Zhao Ke Pan ◽  
Jing Li ◽  
Xiao Ming Li
Keyword(s):  
Particle Size ◽  
Organochlorine Pesticides ◽  
Surface Sediment ◽  
Surface Sediments ◽  
Dry Weight ◽  
Organic Content ◽  
Soluble Salt ◽  
Sediment Characteristics ◽  
Nansi Lake ◽  
Sediment Samples

The correlations of sediment characters[total organic content (TOC), particle size, soluble salt] with organochlorine pesticides (OCPs) in seven surface sediment samples of Nansi lake were discussed. Organochlorine pesticides(OCPs) in seven surface sediment samples of Nansi lake were analyzed by GC／ECD(Gas chromatography with electrochemical detection). The result showed that OCPs content was 2.9-6.91ng/g dw (dry weight).The concentrations of organochlorine pesticides (OCPs) failed to correlate with sediment characteristics (TOC, particle size and soluble salt).

scholarly journals Sediment Sources and Dispersion on the Western Sunda Shelf, Malay Peninsula, Southern South China Sea

Water ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 2823
Author(s):  
Yanguang Liu ◽  
Chuanshun Li ◽  
Ramlan Bin Omar ◽  
Xuefa Shi ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Grain Size ◽  
Surface Sediment ◽  
Surface Sediments ◽  
The Other ◽  
Coarse Grained ◽  
Malay Peninsula ◽  
Sediment Sources ◽  
Southern South China Sea ◽  
Sunda Shelf ◽  
Sediment Samples

Thirty-nine surface sediment samples collected from the western Sunda Shelf off the Malay Peninsula (WSSMP) in the southern South China Sea (SCS) were analysed for grain size, major and trace elemental compositions, and light/heavy mineral contents to trace the sediment sources and their transport mechanisms in the study area. In the WSSMP, the surface sediments are relatively poorly sorted but transportable. A principal component analysis of 37 elements and grain size fractions indicates that the surface sediments can be grouped into four major assemblages in the study area. Integrating with the light/heavy minerals data in the 63–125 μm fractions of the surface sediment samples, to better trace the sediment sources of the coarse-grained components in the marine environment, the study area can be further divided into four sediment provinces. Province I is located in the northwestern part of the study area. The concentrations of TiO2, Na2O, garnet, siderite, and glauconite in Province I were higher than in the other provinces. The main sediment source for this province originated from the Kelantan River and the Gulf of Thailand transported by the northeastern monsoon current. Province II is located offshore of the Pahang and Endau Rivers. The percentages of TiO2, rare earth elements, Al2O3, quartz, plagioclase, hypersthene, and magnetite in the surface sediments were typically higher in this province than in the other provinces. The Pahang and Endau rivers provide most of the sediments to this province, which are transported by southward coastal currents. Province III is located in the northeastern and eastern parts of the study area, where the coarse-grained sediment fraction had relatively high hornblende and biotite contents. Sediments in this province are mostly transported from the Mekong River during the northeastern monsoon. The other parts of the study area belong to Province IV, where the surface sediment elemental and mineral concentrations were mostly between those of the other three provinces. Therefore, we suggest that Province IV has a mixed source due to inputs from the surrounding rivers.

scholarly journals BUTYLTIN RESIDUES IN SEDIMENTS FROM THE EASTERN GULF OF THAILAND

2015 ◽  
Vol 39 (1) ◽  
pp. 15-22
Author(s):  
Nichaya Praditsup ◽  
Gullaya Wattayakorn
Keyword(s):  
Surface Sediment ◽  
Dry Weight ◽  
Weight Basis ◽  
Gulf Of Thailand ◽  
Tissue Samples ◽  
Sediment Samples ◽  
Wet Weight ◽  
Butyltin Compounds

Concentrations of monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT) compounds were analyzed in surface sediment samples collected from twelve stations along the Eastern Gulf of Thailand. The total butyltin (∑BTs) concentrations ranged between <1 and 109.7 ng g (dry weight). The overall concentration ranges found in the sediments were from <1 to 79.81 ng g-1 for MBT, from <1 to 9.5 ng g -1 for DBT, and from <1 to 29.8 ng g-1 for TBT, on a dry weight basis. MBT generally prevailed in most of the samples, suggesting the occurrence of old inputs of butyltin compounds in the area. Butyltin compounds were also measured in Nassarius sp., where ∑BTs concentrations were found to range between <1 and 238 ng g-1 (wet weight). The level of butyltin compounds in gastropod tissue samples tended to be related to that of the sediments and percentage of imposex incidence.

scholarly journals Occurrence and Polymer Types of Microplastics from Surface Sediments of Molawin Watershed of the Makiling Forest Reserve, Los Baños, Laguna, Philippines

2020 ◽  
Vol 19 (1) ◽  
pp. 57-67
Author(s):  
Jomel S. Limbago ◽  
◽  
Marion Michael A. Bacabac ◽  
Dawn Rosarie M. Fajardo ◽  
Camille Rose T. Mueda ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Environmental Science ◽  
Surface Sediments ◽  
River Sediment ◽  
Size Range ◽  
Dry Weight ◽  
Freshwater Ecosystems ◽  
Forest Reserve ◽  
Sediment Samples ◽  
Density Separation

Microplastic pollution is an emerging topic in environmental science. However, information about its prevalence in the freshwater ecosystems is still scarce. This study quantified and identified microplastic form and polymer types from surface sediments of the Molawin River. Sediment samples were collected from the upstream, midstream, and downstream stations of the river. Isolation of microplastics was performed through a modified granulometric approach, density separation, and filtration. Stereoscopic microscopy and Fourier-transform infrared spectroscopy (FTIR) were conducted to quantify and describe microplastics and identify the polymer types based on the infrared spectrum of absorption, respectively. The highest concentration of microplastics was found in the downstream station, with an average number of 97±12 items/100 g and 47.33±11.39 items/100 g sediment dry weight in the bank and channel, respectively. The isolated microplastics were dominated by ≥100 to ≤200 μm size range. Based on stereoscopic microscopy, microfragments and microfibers were the most common microplastic type, while polyethylene (PE) and polypropylene (PP) were the polymer types identified based on FTIR analyses. This study revealed the presence of microplastics and confirmed the microplastics polymers present in the Molawin Watershed of Makiling Forest Reserve.

Occurrence and Seasonal Variation of Tributyltin in Marinas on Lake Ontario, Canada

2000 ◽  
Vol 35 (4) ◽  
pp. 681-692 ◽  
Author(s):  
Fan Yang ◽  
R. James Maguire
Keyword(s):  
Seasonal Variation ◽  
Surface Sediment ◽  
Reference Site ◽  
Lake Ontario ◽  
Dry Weight ◽  
Antifouling Agent ◽  
Survey Results ◽  
Butyltin Compounds ◽  
Dissolved Phase ◽  
Total Concentrations

Abstract A survey of five marinas and one reference site on Lake Ontario, Canada, was conducted to investigate the occurrence and variation of tributyltin (TBT) levels in water between April and December of 1998. The survey results revealed the presence as well as seasonal trends of TBT in these marinas. The TBT concentrations in water were found to coincide with boating activity. The level of TBT generally rose in summer when the boating activity was high, and the highest level of TBT found was 14 ng Sn/L. On average, 92% of the TBT was in the operationally defined “dissolved phase” in the waters analyzed. The butyltin compounds were also found in surface sediment and paint chips from some non-aluminum hulled pleasure boats, with total concentrations of butyltin species (including dibutyltin and monobutyltin) ranging from 59 to 570 ng Sn/g dry weight, and from 0 to 146 μg Sn/g, respectively. The results clearly indicated that TBT in the marina waters primarily originated from antifouling paint on pleasure boats, even though the use of TBT as an antifouling agent was regulated in 1989.

scholarly journals Identification and Significance of Long Chain Fatty Acid Methyl Ester in the Surface Sediment of Taihu Lake

1999 ◽  
Vol 11 (3) ◽  
pp. 245-250 ◽  
Author(s):  
QU Wen-chuan ◽  
◽  
WANG Su-min ◽  
ZHANG Ping-zhong ◽  
CHEN Jian-fa ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Methyl Ester ◽  
Fatty Acid Methyl Ester ◽  
Surface Sediment ◽  
Taihu Lake ◽  
Acid Methyl Ester ◽  
Chain Fatty Acid ◽  
Long Chain Fatty Acid ◽  
Acid Methyl ◽  
Long Chain

Aliphatic and polycyclic aromatic hydrocarbons in surface sediments in Admiralty Bay, King George Island, Antarctica

2004 ◽  
Vol 16 (2) ◽  
pp. 117-122 ◽  
Author(s):  
C.C. MARTINS ◽  
M.C. BÍCEGO ◽  
S. TANIGUCHI ◽  
R.C. MONTONE
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Surface Sediments ◽  
Complex Mixture ◽  
Dry Weight ◽  
Admiralty Bay ◽  
Sewage Outfall ◽  
Total Pahs ◽  
Polycyclic Aromatic ◽  
Marine Surface

Aliphatic (AHs) and polycyclic aromatic hydrocarbons (PAHs) concentrations were measured in marine surface sediments around the Brazilian station in Admiralty Bay, during the summers of 1997/98 and 1999/2000 using GC-FID and GC-MS. Total aliphatic hydrocarbons ranged from 0.15 to 13.28 μg·g−1 (dry weight) while n-alkanes varied between 0.10 and 9.63 μg·g−1. The highest concentrations were obtained at the sewage outfall, with decreasing levels away from the outfall. The distribution of n-alkanes showed significant quantities of long chain n-alkanes (n-C22 to n-C34) at sites near the Brazilian station that may be attributed to the station activities. A short chain n-alkanes sequence (n-C12 to n-C21) associated with diesel fuel arctic (DFA) was present in all the samples. Total PAHs varied from 9.45 to 270.5 ng·g−1. The higher PAHs level and the presence of an unresolved complex mixture only in sediment from the sewage outfall is an indication of oil contamination at this location. A slight increase in PAHs near the Brazilian station since 1993 may be attributed to an increase in the number of staff over recent years. In general, the concentration of AHs and PAHs was similar to that found in other Antarctic areas.

Arsenic, Cadmium, Lead, Mercury, and Selenium in Sediments of Riverine and Pothole Wetlands of the North Central United States

1984 ◽  
Vol 67 (6) ◽  
pp. 1141-1146
Author(s):  
Dan B Martin ◽  
William A Hartman
Keyword(s):  
United States ◽  
South Dakota ◽  
Surface Sediments ◽  
Dry Weight ◽  
North Central ◽  
Riverine Wetlands ◽  
The North ◽  
Central United States ◽  
Cadmium Lead ◽  
Total Concentrations

Abstract Surface sediments (0-10 cm) collected in 1980 and 1981 from 13 wetland areas in Iowa, Montana, Nebraska, North Dakota, and South Dakota were analyzed for total concentrations of arsenic, cadmium, lead, mercury, and selenium. Sediments from pothole-type wetlands had significantly higher concentrations of arsenic, cadmium, lead, and selenium than those from riverine wetlands. Mean (and range) of dry weight concentrations (mg/kg) for pothole and riverine locations, respectively, were arsenic, 4.4 (1.4-9.3) and 2.4 (0.7-6.1); cadmium, 0.52 (0.17-0.87) and 0.26 (0.01-0.55); lead, 13 (7.4-22) and 6.6 (1.1- 14); selenium, 0.89 (0.13-2.1) and 0.52 (0.03-5.1). Mercury concentrations in sediment did not differ significantly between pothole and riverine type wetlands (mean, 0.03, range, 0.01-0.08). A comparison of the concentrations of elements found in this study with values reported in the literature indicated that, with the possible exception of one location, levels were within normal or background ranges.

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