Zhejiang Institute of Geology and Mineral Resources

Hangzhou, China

Zhejiang Institute of Geology and Mineral Resources

Hangzhou, China
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Lou C.,Zhejiang University | Guo D.,Zhejiang University | Wang N.,Zhejiang Academy of Traditional Chinese Medicine | Wu S.,Zhejiang Institute of Geology and Mineral Resources | And 2 more authors.
Journal of Chromatography A | Year: 2017

An online membrane-based distillation (MBD) coupled with ion chromatography (IC) method was proposed for automatic detection of trace fluoride (F−) in serum and urine samples. The system consisted of a sample vessel, a lab-made membrane module and an ion chromatograph. Hydrophobic polytetrafluoroethylene (PTFE) hollow fiber membrane was used in MBD which was directly performed in serum and urine samples to eliminate the matrix interferences and enrich fluoride, while enabling automation. The determination of fluoride in biological samples was carried out by IC with suppressed conductometric detection. The proposed method feasibly determined trace fluoride in serum and urine matrices with the optimized parameters, such as acid concentration, distillation temperature, and distillation time, etc. Fluoride exhibited satisfactory linearity in the range of 0.01–5.0 mg/L with a correlation coefficient of 0.9992. The limit of detection (LOD, S/N = 3) and limit of quantification (LOQ, S/N = 10) were 0.78 μg/L and 2.61 μg/L, respectively. The relative standard deviations of peak area and peak height were all less than 5.15%. The developed method was validated for the determination of fluoride in serum and urine with good spiked recoveries ranging between 97.1–101.9%. This method also can be proposed as a suitable alternative for the analysis of fluoride in other complex biological samples. © 2017

Xue H.,Chinese Academy of Geological Sciences | Ma F.,Peking University | Song Y.,Zhejiang Institute of Geology and Mineral Resources
Acta Petrologica Sinica | Year: 2011

The Suizhou-Zaoyang area (northern margin of the Yangtze craton), where is the least affected area of the whole Qinling-Tongbaishan-Dabieshan-Sulu orogen and their foreland by the deep subduction of the Yangtze Craton beneath to the North China Craton and HP-UHP metamorphism during Triassic, relative well preserved Precambrian basement of the northern Yangtze Craton. These low-rank metamorphosed Precambrian rocks not only provide an ideal opportunity to study the palaeo-tectonic setting of the northern Yangtze Craton and nature of the lithosphere, but also are rare-references for resuming protolithes of the metamorphic complex in the orogen and examining the element mobility during HP-UHP metamorphism. The Precambrian rocks exposed here include Neoproterozoic volcanic-sedimentary rock series (Suizhou Group) and voluminous Neoproterozoic ultramafic-mafic sill swarm. The Suizhou Group is composed of meta-acidic volcanic rocks, meta-basic volcanic rocks, and meta-sedimentary rocks. The ultramafic-mafic sill swarm is composed predominantly of two-pyroxene troctolites, with minor gabbronorites and pyroxenites. In this work, we used zircon SHRIMP U-Pb technique accurately dating the rhyodacitic tuff and meta-trachyandesite of the Suizhou Group, as well as two-pyroxene troctolitic sill swarm, yielding an emplacement ages of 763 ±7Ma, 741 ±7Ma and 632 ±6Ma, respectively. The two former ages are similar to the emplacement ages of protolithes of the HP-UHP metamorphic rocks outcropped in the orogen, but it is still not sure whether there are any emplacement ages of protolith of the eclogite in the orogen are similar to the emplacement ages of the troctolitic sill swarm (632 ± 6Ma). Geochemically, the acidic volcanic rocks exhibit obvious depletion in Sr and high field strong elements (HFSEs) such as Nb and Ta, enrichment in strong incompatible elements such as Rb, Ba, Th, U and K as well as light rare earth elements (LREEs). This type of rocks also show characteristics of strong enrichment in LREE over the HREE ((La/Yb) N = 10. 44), and weak negative Eu anomalies (δEu = 0. 75), similar to the biotite plagiogneisses widely distributed in the Dabie-Sulu orogen and acidic end-member of bimodal volcanic rocks developed in rift setting. The meta-trachyandesite of the Suizhou Group show no fractionation between LREE and HREE, no negative HFSEs anomalies such as Nb and Ta, similar geochemically to most eclogites in the orogen. The troctolitic sill swarm is characterized by high A12O3 and MgO contents, low TiO 2 and alkaline contents, strong enrichment of LREE over HREE ((La/Yb) N = 5. 49), particular for strong positive Ba, Sr and Eu anomalies (δEu = 1. 22), indicating plagioclase crystallization/accumulation. No HFSEs such as Nb, Ta, U, Th, Zr and Hf anomalies for the troctolitic sill swarm show little contamination of crustal material during evolution of the magmas, and that the parent magma could be derived from partial melting of an enriched subcontinental lithospheric mantle.

Xue H.M.,Chinese Academy of Geological Sciences | Ma F.,Peking University | Song Y.Q.,Zhejiang Institute of Geology and Mineral Resources | Xie Y.P.,Bureau of Mineral Resources
Acta Petrologica Sinica | Year: 2010

There are a series of Neoproterozoic granitoids developed in eastern segment of the Jiangnan orogen, LA-ICP-MS zircon U-Pb ages and whole-rock geochemical compositions were determined for those main granitoid intrusions, including Xucun body, Shexian body, Xiuning body, Lingshan body, Lianhuashan body and Shi'ershan body. The granitoid intrusions in the region can be classified into S-type and A-type in petrology and geochemistry, and the former belong to synorogenic magmatic rocks and are mainly granodioritic in component, while the latter belong to late-orogenic magmatic rocks and are granitic in component. The S-type granodioritic magma was generated by partial melting of immature metamorphic sedimentary-volcanic rock, series under dynamic background of collision and crust thicken. But from synorogenic to late-orogenic stages, along with the stress changed fron extrusion to extension, the A-type granites formed include obvious mantle-derived matter. The two types intrusions distributed regularly in space, show obvious southward (ocean side) migration with time. The synorogenic S-type granodioritic intrusions are all located, at the north of the South Anhui suture belt (and inside the suture zone), the Xucun intrusion of S-type granodiorite, situated at the most north part, has the earliest emplacement age of 850 ± 10Ma; Shexian intrusion of S-type granodiorite, which located inside the Anhui suture zone and has the feature of syntectonic, has the emplacement age of 838 ± 11Ma; and also located, inside the suture zone but has the feature of late tectonic, the Xiuning intrusion of S-type granodiorite has the intrusion age of 826 ± 6Ma. Whereas late-orogenic A-type granites are all located at the south of the suture zone, emplacement ages for Lingshan and Lianhuashan A-type granites are 823 ± 18Ma and 814 ± 26 respectively, the two ages are consistent each other considering the errors, and can represent as the time of late-orogenic stage magmatism. The Shi'ershan granite-porphyry formed in post-orogenic rift setting has the emplacement age of 785 ± 11Ma. We consider that the Jiangnan orogen formed in Neoproterozoic era, with characteristics of poly-island arcs amalgalation and poly-sutures. The closing times for different sutures are difference, the earliest closing suture may be the Northeast Jiangxi suture, followed by the Jiangshan-Shaoxin suture, the South Anhui suture was final closed. The arc-type volcanic rocks related with different suture are difference in geochemistry, the two former were developed on oceanic crust background, while the latter was formed on immature continental crust. The Jiangnan orogen had been destroyed by post-orogenic rifting before long it formed, just up to the telophase of Early Paleozoic, the rift between the Yangtze and Cathaysia cratons bad final been closed and formed unionized continent of South China.

Zhu Z.,Zhejiang University | Wu H.,Xinxiang Medical University | Wu S.,Zhejiang Institute of Geology and Mineral Resources | Huang Z.,Zhejiang University | And 2 more authors.
Journal of Chromatography A | Year: 2013

A simple and sensitive method was developed for simultaneous determination of methotrexate (MTX) and folic acid (FA) by ion chromatography with electrochemical detection (IC-ECD). Quaternary amine functionalized multi-wall carbon nanotubes (q-MWNTs) modified glassy carbon electrode (GCE) was used as an amperometric sensor to determine MTX and FA. The electrochemical behaviors of MTX and FA at the q-MWNTs/GCE were studied by cyclic voltammetry (CV). Results indicated that this modified electrode exhibited electrocatalytic oxidation toward MTX and FA with high sensitivity, stability and long life. Good separation of MTX and FA was demonstrated by IC on an anion-exchange column with phosphate buffer solution (PBS) as eluent. Under the optimal conditions, the linear ranges were from 0.01 to 20. mg/L for both MTX and FA with correlation coefficients r≥. 0.9994. The obtained detection limits (LODs) for MTX and FA were 0.2 and 0.4 μg/L (S/. N=. 3), respectively. The method has been successfully applied to the determination of MTX and FA in plasma and urine of patients of rheumatoid arthritis. © 2013 Elsevier B.V.

Chen X.-G.,Zhejiang University | Lv S.-S.,Zhejiang Institute of Geology and Mineral Resources | Zhang P.-P.,State Oceanic Administration | Zhang L.,Zhejiang University | Ye Y.,Zhejiang University
Journal of Thermal Analysis and Calorimetry | Year: 2011

In this study, we ashed rice hull in air and nitrogen, respectively, and systematically investigated the effects of ashing temperature and atmosphere on the structures, morphologies, and pore characteristics of rice hull ash (RHA). All RHA samples are amorphous materials with porous structures. IR spectra revealed that RHA that ashed in air (WRHA) exhibit more polar groups on the surface than that of ashed in nitrogen (BRHA). The silica and carbon contents, BET surface area, and pore volume of BRHA increase with ashing temperature. When ashed in air, however, the silica content of WRHA increases and carbon content decreases with temperature. The BET surface area and pore volume of WRHA increase with temperature firstly and decline subsequently due to the closure of pores. Compared with WRHA, BRHA shows higher surface areas, micropore volumes, carbon contents, and lower mesopore fractions and silica contents. This study provides essential information for choosing a suitable thermal treatment of rice hull for a given adsorbate. © 2010 Akadémiai Kiadó, Budapest, Hungary.

Chen X.-G.,Zhejiang University | Lv S.-S.,Zhejiang Institute of Geology and Mineral Resources | Zhang P.-P.,State Oceanic Administration | Cheng J.-P.,Zhejiang University | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2012

Low density and thin thickness are essential for electromagnetic (EM) wave absorbers. In this study, we fabricated a novel micro-tubular iron nanocomposite (MTIC) that composed of carbon microtubes and monodisperse iron nanoparticles (NPs). The bulk density of MTIC is only 0.35±0.04 g cm -3 due to its micro-tubular structure. The presence of iron NPs increased the magnetic loss significantly and therefore enhanced the reflection loss (RL) of MTIC/paraffin composite. The optimum thickness for the composite is 1.51.8 mm, with maximum bandwidth of 7.6 GHz for RL<-5 dB and 3.6 GHz for RL<-10 dB. The corresponding frequency at this thickness is 1018 GHz. Because of low density and broad bandwidth at thin thickness, MTIC is a promising light-weight absorber for EM wave absorption or microwave shielding. This study will also provide new ideas for fabricating microwave absorbers with low density and thin thickness. © 2012 Elsevier B.V.

Chen X.-G.,Zhejiang University | Cheng J.-P.,Zhejiang University | Lv S.-S.,Zhejiang Institute of Geology and Mineral Resources | Zhang P.-P.,State Oceanic Administration | And 2 more authors.
Composites Science and Technology | Year: 2012

Strong absorption, low density, and thin matching thickness are important parameters for electromagnetic (EM) wave absorbers. In this study, we prepared novel porous magnetic nanocomposites using corncob powders as template. The presence of corncob will significantly decrease the bulk density of samples from more than 4.0 to about 0.55gcm -3. The porous structures remarkably decreased the permittivity (ε) and permeability (μ) and enhanced the impendence matching between the absorber and air. The porous magnetic nanocomposites exhibit enhanced absorption for EM waves at thin matching thickness. The optimum thickness is only 1.0-1.4mm, with bandwidth of RL<-5dB of about 8GHz, covering the half X-band and the whole K u-band. The areal density of magnetic absorbers at this study is only about 0.7-1.0kgm -2 at thickness of 1.0-1.4mm, much lower than the reported values of other magnetic absorbers. Due to the strong absorption at low density and thin matching thickness, the porous magnetic nanocomposites prepared using corncob powders as template are promising light-weight EM wave absorbers. © 2012 Elsevier Ltd.

Zhao Q.,Zhejiang University | Wu S.,Zhejiang Institute of Geology and Mineral Resources | Zhang P.,Zhejiang University | Zhu Y.,Zhejiang University
RSC Advances | Year: 2016

Polyacrylic acid sodium (PAAS), which is an anionic water-soluble polymer, is widely utilized as a thickener in the food industry and flocculant in water treatment owing to its high anion density, low cost and nontoxicity. Herein, we report for the first time the synthesis of monodisperse micron-grade carbon microspheres (CMSs) through the hydrothermal carbonization of sucrose with the assistance of trace PAAS, and their potential application as a green stationary phase for ion chromatography. An appropriate amount of PAAS efficiently inhibits the crosslinking of the formed CMSs, which results in monodispersity. The hydrothermal method was proven effective at a high sucrose concentration and for scalable experiments. The average size of the CMSs could be facilely regulated from 1.2 μm to 5.0 μm via hydrothermal time, temperature and sucrose concentration. The hydrothermal CMSs were further modified with quaternary ammonium groups based on the polycondensation of methylamine and 1,4-butanediol diglycidyl ether. Utilizing the quaternized CMSs as an ion chromatography stationary phase and potassium hydroxide solutions as the mobile phase, common inorganic anions were well separated with good symmetrical peak shapes and high stability. © 2016 The Royal Society of Chemistry.

Chen X.-G.,Zhejiang University | Lv S.-S.,Zhejiang Institute of Geology and Mineral Resources | Liu S.-T.,Zhejiang University | Zhang P.-P.,State Oceanic Administration | And 3 more authors.
Separation Science and Technology | Year: 2012

Rice hull ash (RHA) is an effective and low-cost adsorbent for water purification. In this study, we systematically investigated the effects of ashing temperature and atmosphere on the physic-chemical characteristics of RHA and its adsorption for methylene blue (MB). XRD, SEM, and BET analyses indicate that all RHA samples are porous materials that consist of carbon and amorphous silica. RHA ashed in nitrogen (BRHA) exhibit higher BET surface areas and lower mesopore fractions than that of ashed in air (WRHA) due to the retention of carbon. The pore volumes and surface area of BRHA increase with ashing temperature, while that of WRHA exhibit a first increase and subsequently decrease. The adsorption kinetics of MB adsorption by RHA fit pseudo-second-order model. The calculated q e values exhibit linear relationships with the mesopore volumes of RHA. The adsorption isotherms fit the Langmuir isotherm rather than the Freundlich equation, indicating the monolayer adsorption of MB. WRHA that ashed at 450°C and BRHA that ashed at 750°C present the highest adsorption capacities for MB with q 0 values of greater than 45 mg g -1. This systematic study will provide essential information on the effects of ashing conditions on the physico-chemical characteristics and dye removal of RHA. © 2012 Copyright Taylor and Francis Group, LLC.

Qian J.F.,Zhejiang Institute of Geology and Mineral Resources
Advanced Materials Research | Year: 2014

The Structural and deformational features of fold-thrust belt in the north margin of Kashi, southern Tian Shan were disclosed based on various data such as two dimensional seismic profile and field geologic survey. The results show that the fold-thrust belt can be divided into several rows of anticlines, including Kalaboketuoer-Wenguer, Tuopa-Kangxiweier, Atushi and Kashi on plane, and the development of Atushi anticlines and its north side was controlled by the activity of the thrust system originated along the middle Cambrian Awatage Group from north to south. The fold-thrust belt can be divided into two different spatial levels: the shallow tectonic is a large scale imbricate thrust system, the detachment surface is uplifted from Cambrian system to Neogene system; the deep structure is a buried duplex structure system, the fault in floor and fault in roof are located at gypsic horizon in Cambrian and Neogene system respectively. Based on structural deformation analyzing and balanced section technology, the distribution of each anticlinal belt and the structure style of the low and deep thrust systems are confirmed. In this area the distance is shortened by 32.64~49.1km from north to south since Pliocene with the scalage of 40.5%~50.51%, and its average crustal shortening rate is 9.11~13.71mm/a. © (2014) Trans Tech Publications, Switzerland.

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