Technical Center for Industrial Products and Raw Materials Inspection

Shanghai, China

Technical Center for Industrial Products and Raw Materials Inspection

Shanghai, China
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Ma M.,Technical Center for Industrial Products and Raw Materials Inspection | Ma T.-Z.,Technical Center for Industrial Products and Raw Materials Inspection | Qing J.,Technical Center for Industrial Products and Raw Materials Inspection | Zhou Y.,Technical Center for Industrial Products and Raw Materials Inspection
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The method for the determination of residual epichlorohydrin monomer in epoxy coatings by head space gas chromatography is developed. The results show that the linear range is 2.5-500 μg with the linear equation of y=0.2077x+0.3482 and correlation coefficient of 0.9995. The lowest detection limit of this method is 5 mg·kg-1. The recovery rates are 91.0%-98.1% and relative standard deviation (RSD) (n=6) values are 1.3%-3.0%. This method is simple, rapid and repeatable, which is applicable for the rapid analysis of epichlorohydrin in epoxy coatings. ©, 2015, China National Chemical Information Center. All right reserved.


Zhang L.,Donghua University | Fei X.,Technical Center for Industrial Products and Raw Materials Inspection | Qiu F.,Technical Center for Industrial Products and Raw Materials Inspection | Lin M.,Donghua University
Chinese Journal of Chromatography (Se Pu) | Year: 2015

An ion chromatographic (IC) method with suppressed conductivity detection was developed for the simultaneous determination of Cl-, NO3 - , SO4 2- in food-grade lubricating oils. After ultrasonic extraction with 50% (v/v) methanol aqueous solution and centrifugation, the sample in aqueous phase was purified with 0.22 μm hybrid fiber membranes, then analyzed by IC using 15 mmol / L KOH solution as eluent, and detected by a suppressed conductivity detector. Effects of the concentration and flow rate of the eluent, and the concentration of the methanol aqueous solution on the detection of the three anions were investigated. Under the optimized separation conditions, the three anions were separated completely and the system peaks didn't interfere with the determination. The calibration curves showed good linearity (R2 > 0.999) in the range of 0.10-20.00 mg/L. The limits of detection (LODs, S/N = 3) were 0.01-0.03 mg/kg. The average recoveries of Cl-, NO3 - , SO4 2- anions were 90.0%-103.6% with the relative standard deviations (RSDs) of 2.8%-5.7%. This method avoids the time-consuming pretreatment process to burn or ash the oil phase matrix, and can determine the amounts of three inorganic anions (Cl-, NO3 - , SO4 2-) in food-grade lubricating oils fast and accurately. It is suitable for simultaneously separating and detecting trace inorganic anions in lubricating oils or other oil products.

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