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 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.

scholarly journals Distribution of Polycyclic Aromatic Hydrocarbons (PAHs) in Surface Sediments Collected From Selected Estuaries of Kerala, West Coast of India

2021 ◽  
Author(s):  
Krishnamoorthy Radhakrishnan ◽  
Anandarao Rajkumar ◽  
Nazeerkhan Akramkhan ◽  
Prakasheswar P. ◽  
Subbiah Krishnakumar ◽  
...  
Keyword(s):  
Grain Size ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Surface Sediments ◽  
Total Concentration ◽  
The Other ◽  
Estuarine Sediments ◽  
Sampling Point ◽  
Sediment Grain Size ◽  
Polycyclic Aromatic

Abstract The investigation aims to study the source and concentration of polycyclic aromatic hydrocarbon (PAHs) fractions in the surface sediments of selected estuaries of the southwest coast of Kerala India. The concentration of PAHs ranged from 0.47 to 126.64 ng/g. The estuarine sediments were enriched by HMW-PAHs and they are occupied nearly 93.76 % of the total concentration, followed by LMW-PAHs (LMW-PAH – 6.23%). The sum of surface sediment-associated PAH distribution was higher in the inner part of the estuary, especially at Anjuthengu and Kadinamkulam estuaries. The sediment grain size and distance of the sampling point from the coast are significantly playing an important role in the distribution of the PAHs. The ratio of LMW/HMW PAHs in this study indicating that the pyrolytic process is the chief source of PAHs in the estuarine sediments. The calculated total TEQ value ranged from 0.20 to 54.80 ng/g. A comparative study suggests that the obtained TEQ value was less than the other locations of India and worldwide.

scholarly journals Distribution of Geochemical Species of P, Fe and Mn in Surface Sediments in the Eutrophic Estuary, Northern Taiwan

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3075
Author(s):  
Tien-Hsi Fang ◽  
Cheng-Wen Wang
Keyword(s):  
Grain Size ◽  
Surface Sediments ◽  
River Estuary ◽  
Sediment Samples ◽  
Fe And Mn ◽  
Sequential Extraction Method ◽  
Domestic Effluent ◽  
Reducible Fraction ◽  
Total P ◽  
Northern Taiwan

The Danshuei River Estuary (DRE) in northern Taiwan is a seriously eutrophic estuary due to the domestic effluent discharge. Surface sediment samples were collected from the DRE to study the concentrations and spatial distributions of different fractions of phosphorus through the five-step sequential extraction method which chemically divides the sedimentary P into five fractions: PSORB, PCDB, PCFA, PDET, and PORG. The Fe and Mn contents in the extracted solution were also determined. The total organic carbon (TOC) and grain size in sediment samples were analyzed as well. The sedimentary total P (TP) concentrations ranged within 537–1310 mg/kg and mostly exceeded 800 mg/kg, suggesting that the DRE sediments were moderately polluted by phosphorus. The PCDB was the dominant fraction of P, averagely contributing 58% of TP, followed by PDET 31%. The contributions of the PSORB and PCFA fractions to the TP were relatively minor. Two fractions, FeCDB and FeORG, of sedimentary Fe equally shared approximately 70% of total Fe, followed by FeDET with 22%. The contribution of different fractions of sedimentary Mn followed the sequence: MnCDB (36%) > MnCFA (29%) > MnORG (14.7%) > MnDET (14.5%) > MnSORB (5.3%). The sedimentary P, Fe, and Mn within the DRE are easily mobilized because they were mainly present in the reducible fraction. The concentrations of sedimentary TP positively correlated with the TOC contents and inversely negatively correlated with grain size, suggesting that the TOC and grain size play the crucial roles in influencing the distribution of sedimentary P within the DRE. Finally, the Fe(III) (hydro)oxides seems to play an important carriers to adsorb dissolved P because PCDB positively correlated with FeCDB.

Levels and distribution of organochlorine pesticides in surface sediment after flood season from the old Yellow River Estuary, China

2015 ◽  
Vol 15 (6) ◽  
pp. 1244-1252 ◽  
Author(s):  
Chunnian Da ◽  
Guijian Liu ◽  
Zijiao Yuan
Keyword(s):  
Principal Component Analysis ◽  
Organochlorine Pesticides ◽  
Surface Sediment ◽  
Yellow River ◽  
River Estuary ◽  
Principal Component ◽  
Yellow River Estuary ◽  
The Other ◽  
Sediment Samples ◽  
Flood Season

Organochlorine pesticides (OCPs) are characterized by ubiquity, bioaccumulation and persistence in the environment and are of worldwide concern. Sixteen surface sediment samples were analyzed for hexachlorocyclohexanes (HCHs) and dichlorodiphenyltrichloroethanes (DDTs) to provide information on the levels, distribution and sources of these compounds after flood season in the old Yellow River Estuary, China. The concentrations of ΣDDT were considerably lower than those of ΣHCH. The concentrations of ΣHCH and ΣDDT in sediments after flood season were lower than those in sediments before flood season. The distribution indicated that the levels of HCHs and DDTs from sites near the beach were higher than those in the other sites. The principal component analysis suggested the usage of HCHs could serve as input sources for OCPs. The cluster analysis suggested that there were some similar migration characteristics and similar origins among these pesticides. O'p-DDT and o'p-DDT is of the greatest concern for the ecotoxicological risk.

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 OSTRACODA SEBAGAI INDIKATOR PERUBAHAN LINGKUNGAN PERAIRAN SEKITAR PLTU TARAHAN, TELUK LAMPUNG, SUMATERA

2017 ◽  
Vol 14 (1) ◽  
Author(s):  
Kresna Tri Dewi ◽  
Indra Adhirana ◽  
Yusuf Adam Priohandono ◽  
Luli Gustiantini
Keyword(s):  
Community Structure ◽  
Power Plant ◽  
Surface Sediment ◽  
Surface Sediments ◽  
Environmental Changes ◽  
Environmental Condition ◽  
Offshore Area ◽  
Sediment Samples ◽  
Binocular Microscope ◽  
Krakatau Volcano

Teluk Lampung terletak di bagian selatan Pulau Sumatera yang berhadapan dengan Selat Sunda.  Kualitas ingkungan perairan ini secara perlahan menurun sebagai akibat pertumbuhan berbagai aktifitas manusia di kawasan pesisir.  Tujuan dari studi ini adalah untuk memahami  struktur komunitas ostracoda sebagai komponen sedimen laut terkait dengan perubahan lingkungan perairan ini. Studi ini menggunakan  22 sub-sampel sedimen dari 4 titik lokasi di lepas pantai sekitar PLTU Tarahan dan beberapa sampel sedimen permukaan yang mewakili kondisi lingkungan saat ini. Kemudian sampel sedimen ini dicuci dalam ayakan berbukaan 0.063 mm, dikeringkan dan digunakan untuk studi ostracoda dengan bantuan mikroskop binokuler. Hasilnya menunjukkan bahwa secara vertikal kelimpahan ostracoda menurun atau tidak hadir di beberapa lapisan bawah dasar laut. Hal ini kemungkinan berkaitan dengan erupsi Gunung Krakatau tahun 1883 yang ditunjang oleh keterdapatan material batu apung di lapisan-lapisan sedimen ini. Secara horizontal, ostracoda dari sampel permukaan atau dasar laut cukup bervariasi dan melimpah namun juga menemukan spesimen abnormal seperti rusak dan terisi atau tertutup oleh material berwarna gelap yang mengandung Al2O3 (17,54%) and SiO2 (37,52%). Hal ini kemungkinan berkaitan dengan menurunnya kondisi lingkungan daerah penelitian yang berpengaruh pada habitat ostracoda.Katakunci: ostracoda, spesimen abnormal, perubahan lingkungan, Teluk Lampung Lampung Bay is located in the southern part of Sumatera island that facing to the Sunda Strait. This bay is gradually degradation environment as a result of growing various human activities in the coastal area.  The purpose of this study is to understand the community structure of ostracoda as component of marine sediments related to environmental changes of this area.  This study used 22 sediment sub-samples from four sites in the offshore area of Tarahan power plant and several surface sediment samples represented the present environmental condition. These samples were then washed through 0.063 mm sieve, dried and used for  ostracod study under a binocular microscope. The result shows that,  the ostracoda assemblages, vertically, are decrease or disappear at certain layers below seafloor. It may related to the eruption of Krakatau Volcano in 1883 that was supported by finding of pumice materials in these layers. Horizontally,  ostracod from surface sediments is quite diverse and abundant but we also found abnormal specimens such as abraded and filled or covered by Al2O3 (17,54%) and SiO2 (37,52%).  It may related to decline environment in the study area that likely affect the habitat of ostracoda. Keywords: ostracoda, abnormal specimens, Tarahan power plant.

scholarly journals Mapping of Sediment on the Waters Around Panjang Island, Banten Bay, Indonesia

2021 ◽  
Vol 6 (2) ◽  
pp. 99-106
Author(s):  
Syawaludin A Harahap ◽  
Lintang P. S. Yuliadi ◽  
Noir P. Purba ◽  
Awal A. Aulia
Keyword(s):  
Grain Size ◽  
Surface Sediment ◽  
Fine Sand ◽  
Coarse Sand ◽  
Survey Method ◽  
Sediment Composition ◽  
Medium Sand ◽  
Sediment Distribution ◽  
Sediment Samples ◽  
Sand And Gravel

This study was conducted to map the surface sediment conditions in the waters around Panjang Island, Banten Bay. The survey method was conducted in February 2015 by taking sediment samples using a grab sampler at 15 stations. Sediment analysis was conducted to determine the grain size using the granulometry method which was then processed using the KUMMOD-SEL software to obtain the composition and texture of the sediment. The results of processing sediment samples at each station obtained that the grain size of sediments in the waters around Panjang Island ranged from -0.7 to 2.6 in the phi (φ) scale. Sediment composition consists of sand and gravel, with sand dominance of 89.1 %. Sediment textural classification consists of only 4 categories i.e. very coarse sand, coarse sand, medium sand, and fine sand. In general, the pattern of sediment distribution follows the pattern of water depth, where fine sand occupies deeper areas. Meanwhile, medium sand dominates surface sediment distribution in the study area.

Sign in / Sign up

Export Citation Format

Share Document