Publications (2)0 Total impact
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Article: [Simultaneous determination of bisphenol A and tetrabromobisphenol A in plastic products using high performance liquid chromatography-mass spectrometry].
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ABSTRACT: A method for the determination of bisphenol A (BPA) and tetrabromobisphenol A (TBBP-A) in plastic products using high performance liquid chromatography-mass spectrometry (HPLC-MS) was developed with the ultrasonic extraction. The conditions of sample pretreatment, chromatography and mass-spectrometry parameters were studied systematically. The research showed that the extraction of the BPA and TBBP-A can reach a good performance with 20 mL dichloromethane at 50 degrees C under ultrasonic extraction for 60 min. The BPA and TBBP-A were separated and detected using HPLC-MS with the mobile phase of methanol and water. The linearity range of the method was 0.1-2.0 mg/L. The detection limits were 0.01 mg/kg for BPA and 0.02 mg/kg for TBBP-A. The recoveries for the spiked samples were 85.4%-97.6%. This method is time-saving, easy-handling, practicable and sensitive, and it can be applied to determine the residues of BPA and TBBP-A in plastic products.Se pu = Chinese journal of chromatography / Zhongguo hua xue hui 09/2010; 28(9):863-6. -
Article: [Determination of nonnitrogenous organic acids and inorganic anions in sugarcane molasses and molasses alcohol waste by ion chromatography with solid-phase extraction].
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ABSTRACT: A method was established for the determination of main nonnitrogenous organic acids (including acetic, lactic, succinic, maleic, tartaric, oxalic, fumaric, citric, and aconitic acids) and three inorganic anions (Cl-, SO4(2-) and PO4(3-)) in sugarcane molasses and molasses alcohol waste by ion chromatography with solid-phase extraction. The diluted sample solution was purified by strong anion exchange (SAX) solid-phase extraction (SPE) in a small packed column to remove most of sugar, pigment and other interfering matrices. The eluate obtained from the column was rinsed with diluted KOH solution and filtered through a 0.45 microm inorganic membrane, finally separated on an anion column of IonPac AS15 with the gradient elution of KOH solution and determined with a suppressed conductivity detector. The pretreatment and procedures of SPE for separating organic acids and inorganic anions from their matrix were investigated. The detection limits wee d less than 0.20 mg/L. The relative standard derivations were less than 6.7%. The organic acids and inorganic anions in three real samples (two sugarcane molasses samples and an alcohol waste sample) were determined, the recovery ranges were from 94% to 109%. The method shows good precision and linearity.Se pu = Chinese journal of chromatography / Zhongguo hua xue hui 09/2010; 28(9):893-7.
