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Sun H.,Hebei University | Ge X.,Hebei University | Lv Y.,Hebei University | Wang A.,Beijing Titan Instruments Company
Journal of Chromatography A | Year: 2012

Accelerated solvent extraction (ASE) has become a popular green extraction technology for different classes of organic contaminants present in numerous kinds of food and feed for food safety. The parameters affecting ASE efficiency and application advancement of ASE in the analysis of organic contaminants, natural toxins compounds as well as bioactive and nutritional compounds in animal origin food, plant origin food and animal feed are reviewed in detail. ASE is a fully automated and reliable extraction technique with many advantages over traditional extraction techniques, so it could be especially useful for routine analyses of pollutants in food and feed. © 2012 Elsevier B.V.. Source


de Jesus A.,Federal University of Rio Grande do Sul | Sturgeon R.E.,National Research Council Canada | Liu J.,Beijing Titan Instruments Company | Silva M.M.,Federal University of Rio Grande do Sul | Silva M.M.,Brazilian National Council for Scientific and Technological Development
Microchemical Journal | Year: 2014

Quantitation of mercury in gasoline by graphite furnace atomic absorption spectrometry following its photochemical vapor generation is described. Samples were prepared as a mixture of gasoline and propan-2-ol. A high efficiency flow through 19W photochemical vapor generator was used to process prepared samples with in-situ collection of the resultant Hg0 vapor onto reduced palladium in the graphite tube. Response from inorganic and organomercury standards added to the samples did not differ significantly. A limit of detection and characteristic mass of 0.1μgL-1 and 0.6ng were obtained, respectively. Relative standard deviations of replicate measurements of 3.0ngmL-1 added Hg(II) were typically 7-8%. Recoveries of spikes from samples ranged from 90 to 97%. The concentration of mercury in all tested samples of gasoline was below the limit of quantitation (0.3μgL-1). The method was rapid, efficient, green, fit-for-purpose, responsive to both inorganic and organic mercury species and should also respond to any Hg0 endogenously present in the sample. © 2014 Elsevier B.V. Source


Patent
Beijing Titan Instruments Co. | Date: 2010-12-19

The Ultraviolet pretreatment device in the present invention relates to an interface technique in the field of coupling technology for the analysis of chemical element species. The objective is to provide an Ultraviolet pretreatment device with simple structure, enhanced UV illuminance, and high digestion efficiency. The Ultraviolet pretreatment device in the present invention comprises a low pressure Mercury lamp and a quartz tube, wherein, the low pressure Mercury lamp comprises a lamp tube, electrodes and a power source. The quartz tube is located within the lamp tube, the two ends of the quartz tube are fixedly and respectively joined with the tube wall of the lamp tube, the inner wall of the lamp tube and the outer wall of the quartz tube form a sealed gas chamber, and the electrodes are located in the gas chamber.


Mao X.,Chinese Academy of Agricultural Sciences | Mao X.,Key Laboratory of Agri food Safety and Quality | Liu J.,Beijing Titan Instruments Company | Huang Y.,Chinese Academy of Agricultural Sciences | And 12 more authors.
Journal of Agricultural and Food Chemistry | Year: 2013

To optimize analytical quality controls of solid sampling electrothermal vaporization atomic fluorescence spectrometry (SS-ETV-AFS), the homogeneity (HE) of rice samples and their minimum sample mass (M) for cadmium analysis were evaluated using three certified reference materials (CRMs) and real rice samples. The effects of different grinding degrees (particle sizes <0.85, <0.25, <0.15, and >1 mm) on HE and M of real rice samples were also investigated. The calculated M values of three CRMs by the Pauwels equation were 2.19, 19.76, and 3.79 mg. The well-ground real rice samples (particle size <0.25 mm) demonstrated good homogeneity, and the M values were 3.48-4.27 mg. On the basis of these results, the Cd concentrations measured by the proposed method were compared with the results by microwave digestion graphite furnace atomic absorption spectrometry with a 0.5 g sample mass. There was no significant difference between these two methods, which meant that SS-ETV-AFS could be used to accurately detect Cd in rice with several milligrams of samples instead of the certified value (200 mg) or the recommended mass (200-500 mg) of the methods of the Association of Official Analytical Chemists. © 2013 American Chemical Society. Source


Zhao J.,Hebei Institute of Environmental Geological Exploration | Li Y.,Hebei Institute of Environmental Geological Exploration | Zhao P.,Beijing Titan Instruments Company | Zhang W.,Beijing Titan Instruments Company
Speciality Petrochemicals | Year: 2014

Volatile phenolics in ground water were determined by using flow injection analysis. The detection limit was 0.89 μg/L and the liner range was 0.002-0.1 mg/L (r≤ 0.999). The relative standard deviation was 1%-5%. The throughput was 18/h. The interferences of the coexisted ions were studied. Usually, the positive interference was resulted by the sulfide in ground which leads to the error result. To add H3PO4 into the sample can remove most of the sulfide disruptors and add CuSO4 can remove sulfide left in the sample. Source

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