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Wang H.,Changshu Entry Exit Inspection and Quarantine Bureau | Liu F.,Changshu Entry Exit Inspection and Quarantine Bureau | Wu C.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang G.,Changshu Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Analytical Methods | Year: 2014

An inductively coupled plasma-atomic emission spectrometry method is established for the determination of trace cadmium in steel. The steel sample was dissolved with hydrochloric acid, then the sample solution was passed through a mini-column packed with anion exchange resin DOWEX 1 × 8-200. Cadmium was selectively adsorbed on the column, while iron was passed through. The analyte Cd was then eluted with 1.6 mol L-1 nitric acid and collected in a volumetric flask, thus Cd was enriched and effectively separated from the matrix iron. Separation conditions were optimized via experimental determination of distribution coefficient for Cd and Fe, respectively. Detection limit of Cd was 0.12 μg g-1. Recovery was in the range of 90% to 98%. The relative standard deviation was in the range 5.8%-7.3% (n = 7). The proposed method is applied to the determination of trace cadmium in the steel industry. © The Royal Society of Chemistry 2014. Source


Wang H.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang H.,Fudan University | Wang G.-X.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang G.-X.,Fudan University | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

The high-chromium cast iron sample was microwave-assisted digested with aqueous regia in a closed vessel. Series standards were prepared with matching Fe matrix and adding Y as internal standard. Line intensities of the prepared standards and the digested sample solutions were determined by inductively coupled plasma atomic emission spectrometry. Accuracy of the proposed method was verified by the analysis of three national standard Materials GSBH 41018, GBW 01120 and GBW 01121, and the results were well agreed with the certification data. Source


Liu F.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang H.,Jiangsu Entry Exit Inspection and Quarantine Bureau | Wu C.,Changshu Entry Exit Inspection and Quarantine Bureau | Yu L.,Changshu Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016

The distribution coefficient of iron and cadmium in hydrochloric acid with various concentrations on DOWEX 1×X8 anion exchange resin was determined by Strelow method. The results showed that the Kd value of iron(III) in 1 mol/L hydrochloric acid was less than 10 mL/g, indicating that it could not be adsorbed on the resin. However, the Kd value of cadmium(II) was 2 281 mL/g, indicating that it could be strongly adsorbed on the resin. Therefore, iron(III) and cadmium(II) could be effectively separated. The steel sample for cutlery was dissolved with hydrochloric acid, then the sample solution flowed through the small column which was packed with DOWEX 1×X8 anion exchange resin. The iron(III) in solution could pass through the column, while cadmium(II) would be adsorbed onto the column, realizing the effective separation and enrichment of cadmium and iron. Then, the cadmium(II) on column was eluted with 1 mL of 1.6 mol/L nitric acid. The content of cadmium in collected solution was determined by inductively coupled plasma atomic emission spectrometry(ICP-AES). Consequently, the determination method of micro cadmium in steel for cutlery by ICP-AES after separation with small ion exchange column was established. The mass concentration of cadmium in range of 0.010-0.10 mg/L was linear to the emission intensity. The linear correlation coefficient of calibration curve was 0.9999. The detection limit of cadmium was 0.004 g/mL (which was equivalent to the mass fraction of 0.04 μg/g of cadmium in actual sample). The content of cadmium in steel for cutlery was determined according to the experimental method. The relative standard deviation (RSD, n=7) was 5.8%-7.3%. The recoveries were between 90% and 100%. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved. Source


Wang G.-X.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang G.-X.,Fudan University | Xu Y.-Y.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang H.,Changshu Entry Exit Inspection and Quarantine Bureau | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2011

The influence of boron existing in sample solution on the excitation temperature of the ICP was studied in the present paper. Method of Boltzmann plot of Fe lines were used for the excitation temperature determination. Slop of the plot was obtained from linearity regression. Experimental results showed that excitation temperature was varied with the reference values of lg(gf), and boron concentration has no effect on the temperature. The conclusion is quite different from Ref[5] which was earlier reported by Broekaert. Source


Wang H.,Changshu Entry Exit Inspection and Quarantine Bureau | Wang G.-X.,Changshu Entry Exit Inspection and Quarantine Bureau | Liu F.,Changshu Entry Exit Inspection and Quarantine Bureau | Wu C.,Changshu Entry Exit Inspection and Quarantine Bureau | And 2 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2013

The sample was dissolved in hydrochloric acid and nitric acid. hydrofluoric acid and perchloric acid were added to sample solution. The sample solution was heated and evaporated until dry to remove silicon tetrafluoride and hydrofluoric acid. After soluble salt was dissolved in dilute hydrochloric acid, copper in the solution was determined by flame atomic absorption spectrometry. The effect of dissolving sample with different proportion of mixed acids and the interference of different medium, acidity and coexistent elements were examined. The result indicated the sample could be completely dissolved in hydrochloric acid + nitric acid + hydrofluoric acid + perchloric acid. Hydrochloric acid with the volume fraction of less than 2.5% did not affect the determination of copper. In 100 mL of solution, 40 mg of nickel, 1 mg of cobalt and 10 mg of chromium did not affect the determination of 0.02 mg of copper. 200 mg of iron did not also affect the determination of more than 0.02 mg of copper. However, different amounts of iron affected the determination of 0.01-0.02 mg of copper. Therefore, interference for determining low content of copper may be eliminated by adding iron in blank solution. The detection limit of copper was 0.011 μg/mL and the limit of quantitation was 0.038 μ/mL. The method was used for real sample analysis of nickel substrate. The RSD of the determination result (n=11) was within the range of 1.7%-2.0% and the recovery was between 98%-108%. Source

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