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Yang Y.,Institute for Environmental Hygiene and Health Related Product Safety
Wei sheng yan jiu = Journal of hygiene research | Year: 2011

A high performance liquid chromatography method was established for determination of 9 phenolic compounds in the disinfectant. on a C18 (4.6 mm x 250 mm, 5 microm) chromatography column, use the methol-0.22% sodium heptane solution (pH 3.5) as mobile phase ladder washing, under the following conditions: flow rate 1.0 ml/min, detection wave 280 nm, and the column temperature 25 degrees C. In this method, the linear range of each compound was 5 - 200 mg/L and the correlation coefficients was more than 0.9995. The detection limit was 1mg/L. The RSD was less than 4.8% and standard addition recovery varied from 97.6% to 108.2%. This method was easy to operate, fast and with high sensitivity. It was suitable for routine analysis for disinfectant and can be used for the quality control of effective compounds in disinfectant. Source


Dong B.,Institute for Environmental Hygiene and Health Related Product Safety
Wei sheng yan jiu = Journal of hygiene research | Year: 2010

To study the homogeneity and stability of arsenic in quality controlling cosmetic samples. Arsenic was determined by atomic fluorescence spectrophotometric method. The t-test and F-test were used to evaluate the significant difference of the within-bottle and between-bottle results with three batches. The RSDs of arsenic obtained in different time were compared with the relative expanding uncertainties to evaluate the stability. Average and variance of within-bottle and between-bottle results of arsenic were not different significantly. The RSDs of Arsenic were less than the relative expanding uncertainties. Quality controlling cosmetic samples containing arsenic were considered homogeneous and stable. Source


Zhu H.,Institute for Environmental Hygiene and Health Related Product Safety | Zhang W.,Institute for Environmental Hygiene and Health Related Product Safety | Yang Y.,Institute for Environmental Hygiene and Health Related Product Safety | Zhu Y.,Institute for Environmental Hygiene and Health Related Product Safety
Chinese Journal of Chromatography (Se Pu) | Year: 2014

An analytical method was developed for the determination of the preservative of chlorphenesin in cosmetics by high performance liquid chromatography (HPLC). A Cl8 column (250 mm × 4. 6 mm, 5 μm) and a photodiode array detector were used. The mobile phase was methanol-water (55:45, v/v) with a flow rate of 1. 0 mL/min. The detection wavelength was set at 280 nm and the column temperature was 25 °C. The limit of detection was 3 ng. A good linear relationship was obtained between the peak area and the mass concentration of chlorphenesin in the range of 1 -500 mg/L and the correlation coefficient was 1. 000 0. The recoveries of chlorphenesin at different spiked levels were 99. 0% - 103% with the relative standard deviations (RSD) ≤1.2%. Interference test and sample test were also applied meanwhile and validation experiments were performed by three laboratories. The method is simple, sensitive, accurate, stable and suitable for the determination of chlorphenesin in cosmetics. Source

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