Shandong Provincial Key Laboratory of Coastal Environmental Processes

Yantai, China

Shandong Provincial Key Laboratory of Coastal Environmental Processes

Yantai, China
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Cong M.,CAS Yantai Institute of Coastal Zone Research | Cong M.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Zhang L.,CAS Yantai Institute of Coastal Zone Research | Zhang L.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | And 6 more authors.
Agri Gene | Year: 2016

Heavy metal pollution is an increasing environmental problem around the coastline. As a kind of sedentary mollusk, Venerupis philippinarum is an important sentinel to survey the environmental quality of coastal flat. Glutathione peroxidases are important anti-oxidant enzymes to alleviate oxidative stress caused by heavy metals. In the present study, a new cDNA sequence encoding a Se-containing glutathione peroxidase (VpSeGPx2) was isolated from V. philippinarum. The full-length cDNA of VpSeGPx2 was 963 bp with a conserved selenocysteine insertion sequence (SECIS) in its 3′-UTR, encoding a polypeptide of 242 amino acids with a signal peptide of 19-amino acids. Phylogenetic analysis revealed that VpSeGPx2 was clustered with Se-GPx proteins from marine mollusks. VpSeGPx2 was found to be significantly down-regulated by 10 μg/L of copper and up-regulated by 40 μg/L of copper. However, cadmium exposure seemed to have no significant effect on the expression of VpSeGPx2 transcripts. As for a previously cloned non-Se-containing VpGPx, both concentrations of copper exposure (10 and 40 μg/L) significantly increased its mRNA expression, and a higher concentration (40 μg/L) of cadmium significantly inhibited the expression of VpGPx transcript. These results suggested that VpSeGPx2 and VpGPx were both involved in the detoxification of copper pollution but seemed to play a different role in cadmium pollution. © 2016 Elsevier Inc.

Guan B.,CAS Yantai Institute of Coastal Zone Research | Guan B.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Guan B.,Louisiana State University | Guan B.,Binzhou University | And 9 more authors.
Aquatic Ecology | Year: 2016

Soil salinity and waterlogging are two major environmental problems in estuarine wetlands. To prevent the typical wetland plants from degradation by soil salinization and salt waterlogging and more effectively use the plants to provide wetland ecosystem services, we examined the ecological adaptability of Phragmites australis, a characteristic plant species in the Yellow River Delta, to the interactive effects of water level and salt stress. The results showed that P. australis adapts to salt and water table stressed environments through slowing down the growth rate, maintaining the tiller number, and adjusting the biomass allocation of different organs. The highest plant height and the largest leaf area were at 0 cm water table treatment; the 0.5 % NaCl treatment increased the aboveground biomass; higher water table increased the fibrous root biomass allocation, but largely decreased the leaf biomass. The exclusion of toxic inorganic ions such as Na+ and Cl− and the accumulation of organic solutes are also important mechanisms to aid survival in saline wetlands. On average 35.1 % of Cl− and 53.9 % of Na+ accumulated in belowground organs. The study could provide fundamental guidance for wetland restoration projects and wetland sustainable use in coastal zones such as the Yellow River Delta. © 2016 Springer Science+Business Media Dordrecht

Li T.,CAS Institute of Atmospheric Physics | Xie B.,CAS Yantai Institute of Coastal Zone Research | Xie B.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Wang G.,CAS Institute of Atmospheric Physics | And 4 more authors.
Science of the Total Environment | Year: 2016

Coastal wetlands are important CH4 sources to the atmosphere. Coastal wetlands account for ~10% of the total area of natural wetlands in China, but the size of this potential CH4 source remains highly uncertain. We introduced the influence of salinity on CH4 production and CH4 diffusion into a biogeophysical model named CH4MODwetland so that it can be used in coastal wetlands. The improved model can generally simulate seasonal CH4 variations from tidal marshes dominated by Phragmites and Scirpus. However, the model underestimated winter CH4 fluxes from tidal marshes in the Yellow River Delta and YanCheng Estuary. It also failed to capture the accurate timing of the CH4 peaks in YanCheng Estuary and ChongMing Island in 2012. The improved model could generally simulate the difference between the annual mean CH4 fluxes from mangrove sites in GuangZhou and HaiKou city under different salinity and water table depth conditions, although fluxes were systematically underestimated in the mangrove site of HaiKou city. Using the improved model, the seasonal CH4 emissions simulated across all of the coastal wetlands ranged from 0.1 to 44.90 g m-2, with an average value of 7.89 g m-2, which is in good agreement with the observed values. The improved model significantly decreased the RMSE and RMD from 424% to 14% and 314% to -2%, respectively, and improved the EF from -18.30 to 0.99. Model sensitivity analysis showed that CH4 emissions were most sensitive to Pox in the tidal marshes and salinity in the mangroves. The results show that previous studies may have overestimated CH4 emissions on a regional or global scale by neglecting the influence of salinity. In general, the CH4MODwetland model can simulate seasonal CH4 emissions from different types of coastal wetlands under various conditions. Further improvements of CH4MODwetland should include the specific characteristics of CH4 processes in mangroves to decrease the uncertainty in estimating regional or global CH4 emissions from natural wetlands. © 2016 Elsevier B.V.

Zhang F.,Tongji University | Zhang F.,CAS Yantai Institute of Coastal Zone Research | Zhang F.,University of Chinese Academy of Sciences | Zhang F.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | And 9 more authors.
Atmospheric Chemistry and Physics | Year: 2016

Shipping emissions have significant influence on atmospheric environment as well as human health, especially in coastal areas and the harbour districts. However, the contribution of shipping emissions on the environment in China still need to be clarified especially based on measurement data, with the large number ownership of vessels and the rapid developments of ports, international trade and shipbuilding industry. Pollutants in the gaseous phase (carbon monoxide, sulfur dioxide, nitrogen oxides, total volatile organic compounds) and particle phase (particulate matter, organic carbon, elemental carbon, sulfates, nitrate, ammonia, metals) in the exhaust from three different diesel-engine-powered offshore vessels in China (350, 600 and 1600kW) were measured in this study. Concentrations, fuel-based and power-based emission factors for various operating modes as well as the impact of engine speed on emissions were determined. Observed concentrations and emission factors for carbon monoxide, nitrogen oxides, total volatile organic compounds, and particulate matter were higher for the low-engine-power vessel (HH) than for the two higher-engine-power vessels (XYH and DFH); for instance, HH had NOx EF (emission factor) of 25.8gkWh-1 compared to 7.14 and 6.97gkWh-1 of DFH, and XYH, and PM EF of 2.09gkWh-1 compared to 0.14 and 0.04gkWh-1 of DFH, and XYH. Average emission factors for all pollutants except sulfur dioxide in the low-engine-power engineering vessel (HH) were significantly higher than that of the previous studies (such as 30.2gkg-1 fuel of CO EF compared to 2.17 to 19.5gkg-1 fuel in previous studies, 115gkg-1 fuel of NOx EF compared to 22.3 to 87gkg-1 fuel in previous studies and 9.40gkg-1 fuel of PM EF compared to 1.2 to 7.6gkg-1 fuel in previous studies), while for the two higher-engine-power vessels (DFH and XYH), most of the average emission factors for pollutants were comparable to the results of the previous studies, engine type was one of the most important influence factors for the differences. Emission factors for all three vessels were significantly different during different operating modes. Organic carbon and elemental carbon were the main components of particulate matter, while water-soluble ions and elements were present in trace amounts. The test inland ships and some test offshore vessels in China always had higher EFs for CO, NOx, and PM than previous studies. Besides, due to the significant influence of engine type on shipping emissions and that no accurate local EFs could be used in inventory calculation, much more measurement data for different vessels in China are still in urgent need. Best-fit engine speeds during actual operation should be based on both emission factors and economic costs. © Author(s) 2016.

Zhang H.,CAS Yantai Institute of Coastal Zone Research | Zhang H.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Lin M.,CAS Yantai Institute of Coastal Zone Research | Lin M.,University of Chinese Academy of Sciences | And 4 more authors.
Asian Journal of Chemistry | Year: 2014

In this paper, bismuth served as an internal standard used for reliable anodic stripping voltammetric determination of trace lead at screenprinted carbon electrodes. Besides its negligible concentration in water samples, bismuth can form alloy with lead and their anodic stripping peaks can be separated obviously. The influence of three electrode pretreatment methods and various experimental parameters upon the stripping signal was investigated. Under optimized conditions, the response ratio IPb/IBi against the concentration of lead was linear in the 2-200 μg L-1concentration range with a correlation coefficient of 0.998 after 2 min deposition. The practical application of this method was carried out for the determination of lead in river water samples and the results were consistent with the values obtained by ICP-MS. The attractive behaviors of the low cost carbon strip electrodes coupled with the reliable quantitative strategy facilitates the development of portable electrochemical sensing platform.

Zhang Z.,CAS Yantai Institute of Coastal Zone Research | Zhang Z.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Zhang Z.,University of Chinese Academy of Sciences | Chen Z.,CAS Yantai Institute of Coastal Zone Research | And 8 more authors.
Analyst | Year: 2016

Here, we have carefully investigated iodine-mediated etching of gold nanorods (AuNRs) in the presence of iodate and applied this phenomenon to on-site detection of dissolved oxygen (DO). Under given conditions, the quantitative conversion of target analytes DO to iodine leads to the etching of AuNRs along the longitudinal direction with the aid of cetyltrimethylammonium. As a result, the longitudinal localized surface plasmon resonance shifts to a short wavelength. The peak-shift can be used for quantitative determination of DO and iodate by a spectrophotometer. The satisfactory results from DO detection in different water samples and iodate detection in table salt indicate the feasibility of the proposed methods. Moreover, the as-prepared colorimetric test paper would make the detection more economical and simpler. © 2016 The Royal Society of Chemistry.

Zhang Z.,CAS Yantai Institute of Coastal Zone Research | Zhang Z.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Zhang Z.,University of Chinese Academy of Sciences | Chen Z.,CAS Yantai Institute of Coastal Zone Research | And 5 more authors.
Langmuir | Year: 2014

We have developed a novel approach to the rapid visual detection of Cu 2+ in natural samples based on the copper-mediated leaching of gold nanorods (GNRs). In the presence of hexadecyltrimethylammonium bromide, which can reduce the redox potential of Au(I)/Au, the GNRs are catalytically etched by Cu2+ preferentially along the longitudinal direction. And as a result, the localized surface plasmon resonance extinction peak shifts to short wavelength, accompanied by a color change from blue to red. The leaching mechanism has been carefully discussed in a series of control experiments. Under optimal conditions, this sensor exhibits good sensitivity (LOD = 0.5 nM). Most importantly, the approach is highlighted by its high selectivity for and tolerance of interference, which enables the sensor to detect Cu2+ directly in a complex matrix, especially in seawater. Moreover, such a nanoparticle-based sensor is also successfully applied to test paper for the visual detection of Cu2+. © 2014 American Chemical Society.

Zeng X.,CAS Yantai Institute of Coastal Zone Research | Zeng X.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Zeng X.,University of Chinese Academy of Sciences | Qin W.,CAS Yantai Institute of Coastal Zone Research | Qin W.,Shandong Provincial Key Laboratory of Coastal Environmental Processes
Materials Letters | Year: 2016

The synthesis of MoS2 nanoparticles from MoO3 with a certain morphology through a surfactant-assisted hydrothermal process is described in this paper. MoO3, which has a nanobelt morphology with a width of 100–500 nm and a length from one to several micrometers, is used as the precursor, and poly(vinylpyrrolidone) (PVP) is used as the surfactant. The morphology of the resulting MoS2 nanomaterial has been characterized by the field-emission scanning electron microscope, which shows that the obtained nanoparticles have diameters ranging from 50 to 100 nm with rough surfaces. Additionally, the composition and crystallinity as well as the phase information of the produced nanoparticles have been characterized by the energy-dispersive X-ray spectrometer and X-ray diffraction. Specifically, in this process, the presence of PVP plays a crucial role for the successful fabrication of the nanoparticle morphology, which may be due to the formation of PVP micelles leading to an oriented aggregation of MoS2 nuclei. In addition, comparative experiments have been conducted and the possible reaction mechanism is proposed. © 2016 Elsevier B.V.

Yan K.,CAS Yantai Institute of Coastal Zone Research | Yan K.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Xu H.,Dongying Academy of Agricultural science | Cao W.,Bureau of Education and Sport | And 2 more authors.
Acta Physiologiae Plantarum | Year: 2015

This study attempted to explore how salt priming affected salt tolerance in sweet sorghum with emphasis on root Na+ uptake. After 10 days of pretreatment with 150 mM NaCl, plants were stressed with 300 mM NaCl. After salt stress for 7 days, dry matter of root and shoot decreased by 58.7 and 69.7 % in non-pretreated plants and by 37.9 and 41.3 % in pretreated plants. Consistently, pretreated plants maintained higher photosynthetic rate during salt stress, suggesting the enhanced tolerance by salt priming. Salt priming enhanced osmotic resistance, as proline and relative water contents in the leaf were higher in pretreated plants under salt stress. Salt priming alleviated salt-induced oxidative damage not by improving antioxidant protection due to lower increase in leaf malondialdehyde content and no extra induction on ascorbate peroxidase, catalase, superoxide dismutase, ascorbic acid and reduced glutathione in pretreated plants. After 7 days of salt stress, root Na+ efflux increased by 8.5- and 3.9-folds in pretreated and non-pretreated plants, suggesting that salt priming reduced root Na+ uptake, and then root and leaf Na+ accumulation were mitigated in pretreated plants. However, root Na+ extrusion became indifferent between pretreated and non-pretreated plants under salt stress after inhibiting plasma membrane (PM) Na+/H+ antiporter. Thus, the greater Na+ extrusion induced by salt priming had relation to PM Na+/H+ antiporter. Overall, salt priming improved salt tolerance in sweet sorghum by enhancing osmotic resistance and reducing root Na+ uptake. © 2015, Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków.

Liang R.,CAS Yantai Institute of Coastal Zone Research | Liang R.,Shandong Provincial Key Laboratory of Coastal Environmental Processes | Wang Q.,Qingdao Agricultural University | Qin W.,CAS Yantai Institute of Coastal Zone Research | Qin W.,Shandong Provincial Key Laboratory of Coastal Environmental Processes
Sensors and Actuators, B: Chemical | Year: 2015

Potentiometric sensors have been exploited for the determination of Hg2+ ions. However, applications of such sensors are limited to mercury detection in the absence of a Cl--rich background since Hg2+ can readily form coordination complexes with Cl-. This paper describes a potentiometric sensor for the determination of anionic mercury species using tert-butylcalix[4]arene-tetrakis(N,N-dimethylthioacetamide) as anion-selective ionophore and tridodecylmethylammonium chloride as ion exchanger. An asymmetric membrane rotating ion-selective electrode configuration is used to improve the detection sensitivity. By using HgCl3 - as a model of anionic mercury species, the proposed method allows potentiometric detection of mercury down to nanomolar levels in samples containing 0.05 M NaCl background electrolyte. The practical application of the proposed sensor has been performed for the determination of total mercury concentrations in diluted seawater samples. © 2014 Published by Elsevier B.V.

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