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Li Y.,CAS Institute of Chemistry | Li Y.,CAS Beijing National Laboratory for Molecular | Zhang N.,CAS Institute of Chemistry | Zhang N.,CAS Beijing National Laboratory for Molecular | And 12 more authors.
Journal of the American Society for Mass Spectrometry | Year: 2013

Accurate mass information is of great importance in the determination of unknown compounds. An effective and easy-to-control internal mass calibration method will dramatically benefit accurate mass measurement. Here we reported a simple induced dual-nanospray internal calibration device which has the following three advantages: (1) the two sprayers are in the same alternating current field; thus both reference ions and sample ions can be simultaneously generated and recorded. (2) It is very simple and can be easily assembled. Just two metal tubes, two nanosprayers, and an alternating current power supply are included. (3) With the low-flow-rate character and the versatility of nanoESI, this calibration method is capable of calibrating various samples, even untreated complex samples such as urine and other biological samples with small sample volumes. The calibration errors are around 1 ppm in positive ion mode and 3 ppm in negative ion mode with good repeatability. This new internal calibration method opens up new possibilities in the determination of unknown compounds, and it has great potential for the broad applications in biological and chemical analysis. [Figure not available: see fulltext.] © 2013 American Society for Mass Spectrometry. Source


Zheng J.-M.,Jiangsu Skyray Instrument Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2011

The analytical lines and the matrix effect of 14 rare earth impurities in high purity (99.8%-99.99%) gadolinium oxide were analyzed by ICP2000-AES. The disturbances of analytical lines were investigated in detail, and the appropriate analytical lines were selected. Meanwhile, the detection limits of 14 rare elements are determined, 0.007-0.398 μg/mL, and matrix coordination effect were analyzed by detecting samples. The method is convenient, rapid and accurate. It's referenced valuable for detecting samples in practice. Source


Sun Y.-Y.,Jiangsu Skyray Instrument Co. | Shi L.-H.,Jiangsu Skyray Instrument Co. | Kong K.-K.,Jiangsu Skyray Instrument Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2011

A new method for the determination of magnesium in aluminium alloy by flame atomic absorption spectrometry was established. Under the optimum working conditions of magnesium, the influence of aluminium on the absorption of magnesium was investigated. Strontium nitrate and lanthanum nitrate were used as the releasing agents, then the inhibiting effects were compared. Proper content of lanthanum nitrate can eliminate matrix interference completely. It was applied to determine magnesium in standard aluminium alloy sample with good stability, the recovery rate was less than 108% and the relative standard deviation was less than 1%. Source

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