Proficiency testing is one of methods for regularly assessing the accuracy of the analytical data produced by laboratories
for particular measurements. In 2008 and 2010, we participated in the IAEA 2008 and 2010 worldwide open proficiency tests
on the determination of natural radionuclides in water spiked with 226Ra, 234U and 238U for activity analysis and with 90Sr and 230Th for gross alpha/beta analysis. Feedback statistics from the IAEA final report showed that the radioactivities of all of
the samples fell within an acceptable range according to the IAEA. For 226Ra analysis, our result showed that 229Th–225Ra is suitable as a chemical tracer, although there are doubts that different co-precipitation efficient between parent 229Th and its daughter nuclide 225Ra in published literature. The impact factors of the analysis results, such as the lower limit of detection, standard substances,
the background and efficiency for daily determination, are discussed in detail.
Non-isothermal crystallization of isotactic poly(4-methyl-pentene-1) (P4MP1) is studied by differential scanning calorimeter (DSC), and kinetic parameters such as the Avrami exponent and the kinetic crystallization rate (Zc) are determined. From the cooling and melting curves of P4MP1 at different cooling rates, the crystalline enthalpy increases with the increasing cooling rate, but the degree of crystalline by DSC measurement shows not much variation. Degree of crystalline of P4MP1 calculated by wide angle X-ray diffraction pattern shows the same tendency with crystalline enthalpy, indicating that re-crystallization occurs when samples heated above the second glass transition temperature of P4MP1. By Jeziorny analysis, n1 value suggests that mainly spherulites’ growth at 2.5 K min−1 transforms into a mixture mode of three-dimensional and two-dimensional space extensions with further increasing cooling rate. In the secondary crystallization process, n2 values indicate that the secondary crystallization is mainly the two-dimensional extension of the lamellar crystals formed during the primary crystallization process. The rates of the crystallization, Zc and t1/2 both increase obviously with the increase of cooling rate, especially at the primary crystallization stage. By Mo's method, higher cooling rate should be required in order to obtain a higher degree of crystallinity at unit crystallization time.
This study was to explore a bibliometric approach to quantitatively assessing current research trends on atmospheric aerosol,
using the related literature in the Science Citation Index (SCI) database from 1991 to 2006. Articles were concentrated on
the analysis by scientific output, research performances by individuals, institutes and countries, and trends by the frequency
of keywords used. Over the years, there had been a notably growth trend in research outputs, along with more participation
and collaboration of institutes and countries. Research collaborative papers shifted from national inter-institutional to
international collaboration. The decreasing share of world total and independent articles by the seven major industrialized
countries (G7) was examined. Aerosol research in environmental and chemical related fields other than in medical fields was
the mainstream of current years. Finally, author keywords, words in title and keywords plus were analyzed contrastively, with
research trends and recent hotspots provided.
Authors:Weihua Zhang, Pawel Mekarski, Maxime Dion, Jing Yi, and Kurt Ungar
The study demonstrates the advantages of an innovative list-mode multispectral data acquisition system that allows simultaneous
creation of several different single, summed, coincident and anticoincident spectra with a single measurement. One of the
consequences of list-mode data file offline processing is a reconstructed spectrum with Compton continuum suppression and
without any full-energy peak efficiency deduction owing to true coincidence summing. The spectrometer is designed to read
out analogue signal from preamplifier of gamma-ray detectors and to digitalize it using DGF/Pixie-4 software and card package
(XIA LLC). This is realized by converting an Ortec Compton suppression data acquisition system into an all-digital spectrometer.
Instead of using its timing electronic chain to determine the coincidence event, the analog signals from primary and guard
detectors were connected directly into the Pixie-4 card for pulse height and time coincident measurement by individually logging
and time stamping each electronic pulse. The data acquired in list-mode included coincidence and anticoincidence events consisting
of records of energy and timestamp from primary and guard detectors. Every event was stored in a text file for offline processing
and spectral reconstruction. A sophisticated computer simulation was also created with the goals of obtaining a better understanding
of the experimental results and calculating efficiency.
Authors:Daoxing Sun, Chuanxin Xie, Fan Zhang, Jing Gu, and Jie Sun
The heat release behaviors of several chemical compounds were detected with C80 calorimeter. Furthermore, the thermodynamic and kinetic parameters of the chemicals were obtained based on the experimental data. Chemical thermal risk was simultaneously graded with combined use of instantaneous power density and the classification standard of thermal instability which was offered by the standard system for the identification of the hazards of materials for emergency response (NFPA704). The results show that the grading standard of thermal risk based on NFPA704 was reasonable and can be used as a preliminary thermal risk assessment for reaction hazards.
Authors:Ping Zhang, Hairong Wang, Jianchen Wang, and Jing Chen
To simplify TRPO process, a novel ligand, N,N’-dimethyl-3-oxa-glutaramic acid (DMOGA), was synthesized and used for stripping
of An(III, IV) from 30% TRPO-kerosene. The distribution ratios for transuranium elements, including Np(IV), Pu(IV), Am(III),
and some fission products, including Eu(III), Fe and Zr between 30% TRPO-kerosene and various HNO3-DMOGA solutions were measured. An(III, IV) and Ln(III) extracted to TRPO from simulated high level liquid waste could be
recovered with an efficiency of 99.9% above in one stream with a 3-stage crosscurrent strip experiment with 0.2M DMOGA in
HNO3 solution. Using this new agent, the back extraction of TRU elements from loaded TRPO phase becomes more simple and practical.
Therefore, the original TRPO process could be simplified.
Authors:He Zhang, Mei Meng, Li Chen, Fang Wang, Jing Zhang, Ying Jiang, and Wen Wang
The newly emerged chromatographic fngerprint analysis represents a rational approach assessment of Traditional Chinese Medicine (TCM) and its preparations. In the present paper, a quick and reliable analytical method was developed for the quality assessment of QiYi capsules (QY) using high-performance thin-layer chromatography (HPTLC) with the reference of Tripterygium wilfordii. The unique properties of the HPTLC fngerprint were validated by analyzing 10 batches of QY samples. The 9 common peaks of the HPTLC images of QY and the different RF and peak area ratios of the chemical distribution could directly discern the stability by comparison of 10 samples, and also, the 9 common peaks were selected to evaluate the similarities of QY; the similarities of 10 batches of QY were more than 0.960, which indicated a standardized consistency and reliable quality of QY. Therefore, the newly developed HPTLC fngerprint method provided an easy way for sample characterization and differentiation; it allowed for the quality assessment of QY capsules with the reference of T. wilfordii.
Authors:Jing Zhang, Mei Meng, Ying Jiang, He Zhang, and Fang Wang
A new high-performance thin-layer chromatographic (HPTLC) method has been developed for the simultaneous estimation of astragaloside IV and formononetin in Radix Astragali. Samples were employed to degrease the materials by petroleum ether (boiling point: 60–90°C) and extracted by methanol, and then were alkalized and extracted with n-butanol saturated with water. Separation was achieved on HPTLC plates using petroleum ether (boiling point: 60–90°C) and n-butanol saturated with water-glacial acetic acid as the mobile phase, the results of which were compared with HPLC. The well-resolved peaks for astragaloside IV and formononetin were observed at RF values 0.43 ± 0.02 and 0.75 ± 0.02, respectively. The calibration curves were found linear with a wide range of concentration 1.01–10.10 μg μL−1 with good correlation coefficient for astragaloside IV and formononetin. The method was validated for linearity, precision, reproducibility, accuracy, and limits of detection and quantification. This simple, rapid, sensitive, economic, and reliable HPTLC method is suitable for the routine quantitative analysis and quality control of traditional Chinese medicines (TCMs) such as Radix Astragali, which can be applied for the quality control of saponins and flavonoids in other plants or extracts.
The atmospheric particulate matter samples were collected in Shanghai, China. The X-ray absorption near-edge structure (XANES)
spectra of Cr, Mn, Cu and Zn were measured. The XANES spectroscopy was used as a fingerprint to compare with that of reference
materials to obtain speciation information. The oxidation state of these elements and main chemical components in the samples
were described using the method. The results show that in our samples the oxidation state of Cr is trivalent, Mn mainly exists
in the divalent state, Cu also exists in the divalent state, and Zn mainly exists in the zinc sulfate. For the XANES spectra
of samples with different particle size and from different sampling site, we did not find their obvious differences. When
we compared the XANES spectra of our samples with those of standard reference material SRM 1648, we found that they are similar
in regards to the determined elements. The elemental concentrations in the samples were determined by proton induced X-ray
emission (PIXE). The difference of elemental concentrations was observed in the different samples.
Authors:Shuanghu Wang, Zixia Lin, Ke Su, Jing Zhang, Lijing Zhang, Zhimou Gao, Zhiyi Wang, Jianshe Ma, and Xianqin Wang
The rats were randomly divided into paraquat group, curcumin treatment group, and pirfenidone treatment group. The concentration of paraquat in rat plasma was determined by an ultra-performance liquid chromatography–tandem mass spectrometry (UPLC–MS/MS) method over the range of 10–2000 ng mL−1. Chromatographic separation was achieved on a BEH HILIC (2.1 mm × 100 mm, 1.7 μm) column. The mobile phase was consisted of acetonitrile and 10 mm ammonium formate buffer (containing 0.1% formic acid) with gradient elution pumped at a flow rate of 0.4 mL min−1. Protein precipitation with acetonitrile was used as sample preparation. Compared with the paraquat group, there is statistical toxicokinetic difference for curcumin treatment group and pirfenidone treatment group, AUC(0 − t) decreased (P < 0.05), clearance (CL) increased (P < 0.05) for curcumin or pirfenidone treatment group, and Cmax decreased (P < 0.05) for curcumin treatment group. The results showed that treatment by curcumin and pirfenidone could relieve acute paraquat poisoning in rats.