State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants

Changsha, China

State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants

Changsha, China
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Lin H.-L.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Li Z.-H.,GRG Metrology & Test Hunan Co. | Zhu R.-L.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Zhu R.-L.,Beijing Normal University | And 4 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2016

A method for determination of the contents of Bi in soils and sediments by atomic fluorescence spectrophotometry (AFS) was established by using aqua regia as the dissolved medium. In this paper, the instrument parameters, load flow and reducing agent concentration were optimized. Compared with microwave digestion and electric heating plate digestion, water bath digestion demonstrated the better digestion efficiency and was most commonly used. Under the optimal experimental conditions, the detection limit (LOD) was 0.01 mg·kg-1 (sample quantity 0.500 0 g, sample volume 50 mL), and the limit of quantitation (LOQ) was 0.04 mg·kg-1. The results were in good agreement with the centified value, and the relative error was -4.7%~-2.0%. For determination of soil and sediment actual samples, the relative standard deviation (RSD) were 2.5%~3.4% and 3.1%~3.4%, respectively, and the recoveries of the method respectively ranged from 97.6%~102% and 99.5%~104%. © 2016, Peking University Press. All right reserved.


Lin H.-L.,Hunan Province Environmental Monitoring Cerner | Lin H.-L.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Gan J.,Hunan Province Environmental Monitoring Cerner | Gan J.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | And 9 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2015

A method for determination of beryllium in soils and sediments by microwave-acid digestion/graphite furnace atomic absorption (GFAA) is described. In this paper, the working conditions of the instrument are optimized, the drawing of calibration curve is expounded, the pretreatment process of soil and sediments (including microwave heating process and the selection of digestion system) is discussed, and the interference of coexisting elements is examined. The sample was pretreated by microwave digestion parameters using HNO3/HCl/HF mixed acid system. The method is fast and simple without matrix modifier, and has no interference by coexisting ions, and has high repeatability and reproducibility. Under the optimal experimental conditions, the limit of detection (LOD) is 0.004 9 mg·kg-1 (sample quantity 0.200 0 g, sample volume 25 mL), and the limits of quantitation (LOQ) is 0.020 mg·kg-1. This method is used to measure the standard samples and actual samples, whether in the laboratory, or between laboratories, has good accuracy and precision. © 2015, Science Press. All right reserved.


Cao X.M.,Changsha Environmental Protection College | Tian Y.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants
Bioengineered | Year: 2016

ABSTRACT: Thermal denaturation of lysozymes was studied as a function of protein concentration, phosphate buffer concentration, and scan rate using differential scanning calorimetry (DSC), which was then analyzed by the isoconversional method. The results showed that lysozyme thermal denaturation was only slightly affected by the protein concentration and scan rate. When the protein concentration and scan rate increased, the denaturation temperature (Tm) also increased accordingly. On the contrary, the Tm decreased with the increase of phosphate buffer concentration. The denaturation process of lysozymes was accelatated and the thermal stability was reduced with the increase of phosphate concentration. One part of degeneration process was not reversible where the aggregation occurred. The other part was reversible. The apparent activation energy (Ea) was computed by the isoconversional method. It decreased with the increase of the conversion ratio (α). The observed denaturation process could not be described by a simple reaction mechanism. It was not a process involving 2 standard reversible states, but a multi-step process. The new opportunities for investigating the kinetics process of protein denaturation can be supplied by this novel isoconversional method. © 2016 Taylor & Francis.


Qin D.-L.,Hunan Province Environmental Monitoring Center | Qin D.-L.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Wei A.-L.,Northwest University, China | Lu S.-Y.,Chinese Research Academy of Environmental Sciences | And 8 more authors.
Research of Environmental Sciences | Year: 2013

The equitable and reasonable allocation of the total permitted pollution discharge is the key to the load control of the total water pollutant. A specific assessment system of the water pollutant load allocation based on the environmental Gini coefficient method was established by taking the whole benefit of the social, economic and natural resources into account. The spatial distribution characteristics of the unfair factors in the area of Dongting Lake were also analyzed through selecting the contribution coefficient as a judge for unfair factors combined with the GIS technique. Additionally, the program of the total load allocation for water pollutants in the Dongting Lake area was proposed according to the minimized model of Gini coefficient. The research found that Gini coefficients of TN and TP based on both GDP and land area were higher than 0.2, which was over the reasonable limitation of the Gini coefficient. These higher Gini coefficients implied unfair pollutant discharge in the lake area. In addition, there were unfair features in different parts of the lake area. Among three large pollution control zones, zone I(pollution control zone of central cities) and zone III(ecological conservation zone of mountains/hills) offered the least land area contribution coefficients and the least green contribution coefficients, respectively, which implied the presence of the most significant unfair features in these two zones. To change the unfair status, the minization of Gini coefficients led to an optimization of pollutant discharge allocation in 2020 based on the data in 2008. In the optimized strategy of the total nitrogen discharge, zone I would have the reduction rate of 8.18%, which would be the largest among all the three pollution control zones. In addition, Yueyang City would have the biggest reduction amount of 865.0 t/a among all the twenty administrative units in the lake area. For the total phosphorus discharge, zone II(comprehensive improvement zone of plan agriculture) would have the largest reduction rate of 9.45%, and Huarong County would have the greatest reduction amount of 78.45 t/a.


Zeng J.,Hunan Province Environmental Monitoring Center | Zeng J.,State Environmental Protection Key Laboratory of Monitoring for Heavy Metal Pollutants | Zeng J.,Xiangtan University | Qin D.,Hunan Province Environmental Monitoring Center | And 11 more authors.
Chinese Journal of Environmental Engineering | Year: 2014

In this work, the combination materials of natural minerals including bentonite, sepiolite and limestone were used as permeable reactive barrier (PRB) filling materials and 16 permeable reactors were designed with orthogonal test method to study the feasibility and efficiency of the PRB technology in the remediation of cadmium contaminated ground-water. The influences of the combination ratio of the minerals on the treatment effect of Cd contamination, the pH of effluents, the porosity and permeability of the barriers were studied. Moreover, the remediation mechanism was also analyzed. The experimental results showed that the Cd removal rates of the applied combination materials were above 99.8%. The dosage of limestone was the main factor controlling to the treatment effect of Cd, which was obviously improved by increasing the amount of limestone. When the limestone content reached 10%, the Cd concentration of simulated Cd-polluted ground-water after treatment was less than 0.7 μg/L, which can meet the class II water quality standard according to groundwater quality criteria (GB/T 14848-93). Increasing the amount of limestone had little effect on the permeability of the barrier, but it led to a weakly alkaline effluent (7

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