Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau

Qingdao, China

Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau

Qingdao, China
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Xiu X.,Qingdao University of Science and Technology | Luo X.,Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau | Niu Z.,Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau | Ye X.,Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau | And 4 more authors.
Se pu = Chinese journal of chromatography / Zhongguo hua xue hui | Year: 2013

A method of high performance liquid chromatography-linear ion trap/Orbitrap high resolution mass spectrometry (HPLC-LTQ/Orbitrap MS) was used to screen and confirm carcinogenic dyes in textiles. The analytes were extracted from textile samples with pyridine/water (1/1, v/v) in a water bath under controlled conditions (95 degrees C, 150 r/min), and then filtered with a 0.22 microm polytetrafluoroetylene (PTFE) membrane. The eluates were separated on a CAPCELL PAK C18 column (100 mm x 2.0 mm, 5 microm) using gradient elution with acetonitrile/ 5 mmol/L ammonium acetate aqueous solution containing 0.01% formic acid (in positive mode) and acetonitrile/5 mmol/L ammonium acetate aqueous solution (in negative mode), and finally detected by HPLC-LTQ/Orbitrap MS in ESI modes. Full scan experiments were performed over the range of m/z 200-800. The screening and quantitative analysis were carried out by the accurate mass of quasi-molecular ion and the peak area in extracted chromatogram with accurate mass, respectively. The confirmatory analysis for target compounds was performed with the retention time and qualitative fragments obtained by data-dependent scan mode. Under the optimal conditions, nine carcinogenic dyes were routinely detected with mass accuracy below 5 x 10(-6) (5 ppm), and good linearities were provided in their respective linear ranges with correlation coefficients higher than 0.99. The limits of detection were in the range of 0.125-25 mg/kg. The average recoveries at three spiked levels were in the range of 62.13%116.28% with the relative standard deviations (RSDs) lower than 15%. The proposed method was applied to screen and confirm the nine carcinogenic dyes in textile samples. It is convenient and reliable.


PubMed | Technical Center for Inspection and Quarantine of Shandong Entry Exit Inspection and Quarantine Bureau
Type: Journal Article | Journal: Huan jing ke xue= Huanjing kexue | Year: 2012

Mixing behavior of arsenic in the Daliaohe Estuary was studied. Twenty samples were collected from the Daliaohe Estuary during April, July and November, 2010 and arsenic was determined by HG-AFS. The concentrations of arsenic varied from 2.98-44.1, 1.19-14.6, 1.27-12.4 microg x L(-1) in April, July and November. The seasonal variation of arsenic content was significant. In July, the concentration of arsenic was lower than that in April, and higher than that in November. The data indicated that arsenic did not behave conservatively in April and November, but behaved conservatively in July. An important mobilization of dissolved arsenic was observed from the river up to halfway in the estuary in April and November, 2010. Both input flux (from river to estuary) and output flux (from estuary to coastal zone) of dissolved arsenic were calculated from statistical interpretations of the salinity profiles. Concentration of arsenic in the Daliaohe Estuary is higher than large systems, like the Changjiang Estuary and Zhujiang Estuary.

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