Fangchenggang Entry Exit Inspection and Quarantine Bureau

Fangchenggang, China

Fangchenggang Entry Exit Inspection and Quarantine Bureau

Fangchenggang, China
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Li Z.-G.,Xinjiang Institute of Ecology and Geography | Li Z.-G.,CAS Wuhan Botanical Garden | Zhang R.-H.,CAS Wuhan Botanical Garden | Lai D.-M.,Xinjiang Institute of Ecology and Geography | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2012

In April-October, 2009, a field experiment was conducted to study the effects of drip irrigation with plastic mulching(MD) on the net primary productivity(NPP), soil heterotrophic respiration(Rh), and net CO2 exchange flux(NEFCO2) of cotton field ecosystem in Xinjiang, taking the traditional flood irrigation with no mulching(NF) as the control. With the increasing time, the NPP, Rh, and NEFCO2 in treatments MD and NF all presented a trend of increasing first and decreased then. As compared with NF, MD increased the aboveground and belowground biomass and the NPP of cotton, and decreased the Rh. Over the whole growth period, the Rh in treatment MD(214 g C·m-2) was smaller than that in treatment NF(317 g C·m-2), but the NEFCO2 in treatment MD(1030 g C·m-2) was higher than that in treatment NF(649 g C·m-2). Treatment MD could fix the atmospheric CO2 approximately 479 g C·m-2 higher than treatment NF. Drip irrigation with plastic mulching could promote crop productivity while decreasing soil CO2 emission, being an important agricultural measure for the carbon sequestration and emission reduction of cropland ecosystems in arid area.


Tang S.-T.,Guangxi Jinchuan Non ferrous Metal Co. | Yin X.,Guangxi Jinchuan Non ferrous Metal Co. | Yin W.-M.,Guangxi Jinchuan Non ferrous Metal Co. | Luo M.-G.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2017

There was no corresponding national standard or industrial standard for determination of components in crude copper converting slag. As a result, a determination method of components in crude copper converting slag was established by X-ray fluorescence spectrometry (XRF) with pressed powder pellet. The analytical conditions were obtained as follows by experiments: the sample grinding time was 60 s; the particle size was 180 mesh (84 μm); the sample pressing pressure was 25 t; the pressing time was 25 s; the working current and voltage was 50 mA and 60 kV, respectively. The problem of poor linearity of calibration curves for Pb, Sb and Bi was solved through correction by theoretical α coefficient and empirical coefficient method. The root mean square deviation (RMS) and quality factor (K) of calibration curves of each component could meet the requirements. Seven specimens of the same flash crude copper converting slag were prepared for precision tests. The relative standard deviations(RSDs) were less than 2% for the major components with mass fraction not less than 1%, while the RSDs were less than 10% for the minor components with mass fraction lower than 1%. The crude copper converting slag sample was analyzed according to the experimental method. The results were consistent with those obtained by other methods. Although the determination deviation of Cu was relatively higher, it could still meet the requirements for rapid ladle analysis. © 2017, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Liu G.-W.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Wang X.-G.,Guangxi University | Cui D.-S.,China Certification and Inspection Group Guangxi Co. | Gong F.-Z.,Guangxi University
Yejin Fenxi/Metallurgical Analysis | Year: 2010

The phosphate ore samples were pretreated by microwave digestion technique. The key factors such as acid medium, dosage, and the pressure and time of microwave digestion were investigated. Consequently, a determination method of lead in phosphate ore by flame atomic absorption spec-trometry was established. The results indicated that in four acid mediums(hydrochloric acid, nitric acid, sulfuric acid and aqua regia), the sample dissolving effect in aqua regia was the best. Its proper dosage is 5 mL per grammes. The three-step microwave digestion procedure were adopted with digestion pressure and time: 0.3 Mpa/60 s, 0.5 Mpa/360 s, l.0 Mpa/180 s. Compared with traditional acid solution method, the dissolving time of microwave digestion was short, and the sample dissolution was complete. The detection limit of method was 0.036 μg/mL. The proposed method was applied to the determination of phosphate ore samples. The relative standard deviation(RSD) was 4.1%-6.6%, and the recovery of standard addition was 94%-108%.


Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Luo M.-G.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Wei X.-H.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2016

After the zinc concentrate sample was treated by microwave digestion with 5 mL of aqua regia as solvent, a quantitative analysis method of trace thallium in zinc concentrate was established by inductively coupled plasma mass spectrometry(ICP-MS) with 205Tl as determination isotope. The microwave digestion procedures were optimized as follows: the digestion temperature was 190℃, the temperature rising time was 20 min, and the digestion holding time was 20 min. The matrix effect was eliminated by direct dilution method, and the solid mass concentration in testing solution was controlled at not more than 0.5 mg/mL. The results showed that the mass concentration of thallium in range of 0.10~50.00 μg/L had good linearity to its corresponding peak strength. The correlation coefficient of calibration curve was 0.999 9. The detection limit of method was 0.001 8 μg/L, and the lower limit of determination was 0.006 μg/L. The content of trace thallium in zinc concentrate actual samples was determined according to the experimental method. The results were consistent with those obtained by national standard method, i. e., foam plastic enrichment-inductively coupled plasma atomic emission spectrometry(ICP-AES). The relative standard deviations (RSD, n=11) were less than 5%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.


Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Tang M.-Q.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Yuan H.-M.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Wei X.-H.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2014

Accurate content of antimony was an important index to the trade settlement of antimony ore, so the accurate determination of antimony and other elements in antimony ore was pretty important to mineral comprehensive evaluation and utilization. Mixed reagent of Li2B4O7 and LiBO2 (m:m=67:33) was used for sample fusion at 1 050 ℃ and 0.20 mL of 60 mg/mL LiBr solution was used as release agent. Thus, simultaneous determination of twelve components such as Sb2O3, Al2O3, SiO2, CaO, TiO2, MnO, MgO, Fe2O3, Cu, Zn, Na2O and K2O in antimony ores was realized by wavelength dispersive X-ray fluorescence spectrometry. The corrosion problems of Pt-Au alloy crucibles by antimony sulfide ore containing high content of sulfur was solved by pre-oxidizing the sample with LiNO3 at low-temperature. The calibration curve which could satisfy the quantitative determination requirements of each component was established with eight antimony certified reference materials (CRMs) and calibration samples synthesized with CRMs. Besides, theoretical α coefficient method was adopted to correct matrix effect. After precision test, the relative standard deviation (RSD, n=12) of the determination of the components in antimony ore samples was between 0.1%-9.7%. The accuracy of CRMs and synthesized samples was validated, and the analytical results were consistent with the certified value or reference value.


Tang M.-Q.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Ruan G.-W.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Wei Y.-Q.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2015

There was no test method for asbestos in oxide scale in China so far. In this paper, after the sample was dispersed with isopropanol and followed by suction filtration onto the glass fiber filter, a method was proposed for determination of chrysotile, crocidolite and amosite in oxide scale by X-ray diffraction absorption base standard correction method. The linearity of calibration curves for determination of chrysotile, crocidolite and amosite was good. The detection limit was 0.004 5%, 0.002 3% and 0.000 65%, and the lower limit of quantitation was 0.014%, 0.0069% and 0.002 0%, respectively. The prepared oxide scale with 0.20% of asbestos was analyzed. The relative standard deviations (RSD, n=10) of determination results were all less than 8%. The proposed method was verified with the oxide scale sample. The determination results of asbestos were consistent with the reference values. The method could meet the detection requirements for trace asbestos in oxide scale with mass fraction of 0.10%-0.50%. ©, 2015, Central Iron and Steel Research Institute. All right reserved.


Chen Y.-X.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Wei X.-H.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Lv Z.-E.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Ruan G.-W.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2011

After dissolved with mixed acids, gold and palladium in rock and mineral samples were separated and enriched by sulfhydryl cotton in 1.2 mol/L HCl solution. Consequently, a determination method of gold and palladium by inductively coupled plasma mass spectrometry (ICP-MS) was established. The experiment conditions about sample decomposition, adsorption and elution were discussed. Experiment results showed that the mass spectral interference was eliminated by sulfhydryl cotton separation and enrichment in combination with selecting appropriate analytical element. Then, the matrix effect and instrument fluctuation were corrected with matrix matching method and Re as the internal standard element. The detection limits of this method for gold and palladium were 0.13 and 0.22 ng/g respectively. When the method has been applied to determine certified reference materials, the results were consistent with the certified values with the relative standard deviations (RSD, n = 9) of 4.8%-8.3%, which could meet the analysis and testing requirements for rock and mineral samples.


Zhang J.-B.,Ningbo Entry Exit Inspection and Quarantine Bureau | Wang Q.,Ningbo Entry Exit Inspection and Quarantine Bureau | Lin L.,Ningbo Entry Exit Inspection and Quarantine Bureau | Luo M.-G.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2011

The chemical valence of manganese in manganese ore sample was studied. It was found that, the chemical valence of manganese in singly-ignited sample was the same to Mn3O4 and similar to MnO in fused piece. Accordingly, the relationship between the determination method of loss on ignition and the chemical valence of manganese in matrix effect correction was identified. A X-ray fluorescence spectrometric determination method of major and minor components in manganese ore was established. The analytical results of this method were in good agreement with the certified values and the mean value of parallel tests of several certified reference materials. The relative standard deviations(RSD, n=7) of main components in manganese ore were smaller than 2%. The RSD of Mn and Fe was 0.20% and 0.16%, respectively, which could meet the determination requirements of components in manganese ore.


Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Xie Y.-Q.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Yang H.-J.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Luo M.-G.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Ruan G.-W.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2012

A direct determination method of Cd in titanium dioxide by flame atomic absorption spectrometry was established after dissolution of sample with HF. HNO 3 was used for dissolution of salts in the sample and removal of the residual HF. The sample dissolution conditions, acid dosage and the interference of matrix and coexisting elements were discussed. It was found that, the coexisting elements in TiO 2 matrix and titanium dioxide at the highest content did not interfere with the determination of cadmium under the selected experimental conditions. The linear range of method was 0.02-2.0 μg/mL, the detection limit was 0.0033 μg/mL, and the lower limit of quantitation was 0.011 μg/ mL. The proposed method was applied to the determination of actual sample, and the results were consistent with those obtained by inductively coupled plasma mass spectrometry. The relative standard deviation (RSD, n=11) was smaller than 1%, and the recoveries were 98%-103%.


Chen Y.-X.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Zeng X.-L.,Dionex China Research and Application Center Hangzhou Laboratory | Li X.-R.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Lu Z.-E.,Fangchenggang Entry Exit Inspection and Quarantine Bureau | Ma L.-F.,Fangchenggang Entry Exit Inspection and Quarantine Bureau
Yejin Fenxi/Metallurgical Analysis | Year: 2012

The anion and cation (F -, Cl -, NO 2 -, Br -, NO 3 -, SO 4 2-, PO 4 3-, Li +, Na +, NH 2 +, K +, Mg 2+ and Ca 2+) in leaching solution of smelting slag were determined by reagent free ion chromatography. The separation conditions of anion: cation exchange column Ion Pac AS19, gradient elution with potassium hydroxide solution, suppressed conductance detection, flow rate of 1 mL/min; separation conditions of cation: anion exchange column Ion Pac CS16, gradient elution with methanesulfonic acid solution, suppressed conductance detection, flow rate of 1.3 mL/min. The relative standard deviations (RSDs) of retention time, peak height and peak area of testing ions within one day were less than 0.35 %, 1.8% and 1.1%, respectively. The RSDs of retention time, peak height and peak area of testing ions in continuous five days were less than 0.78 %, 2.4% and 1.6%, respectively. The concentration of determined ions with its peak area had good linearity (r=0.9990-0.9999). The detection limit was lower than 20 μg/L. The anion and cation in leaching solution of imported scale slag, vanadium slag and manganese-rich slag were determined with recoveries of standard addition in the range 86%-110%.

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