Determination of Sudan Ⅰ-Ⅳ and Dye Para Red in Lipstick by HPLC / 环境与健康杂志

Objective To establish an HPLC method to determine sudan Ⅰ-Ⅳ and dye para red in the lipstick. Methods The samples were extracted with the acetonitrile, after centrifuge and filter, the extracted solution was tested by HPLC-UV and the external standard method was employed to do the quantitative analysis. Results As the concentrations was 1.0 mg/kg, the mean recovery rates were 93%-97%, the RSD was less than 4.6%, the detection limit was 0.05 mg/kg and the linear range was 0.2-5.0 mg/kg(the correlative coefficient ranged 0.998 5-0.999 8). Conclusion This method is simple, accurate, rapid and applicable to the determination of sudan I-IV and dye para red in the lipsticks.

Proficiency Testing of Three Organochlorine Pesticides Determination in Vegetable Oils in Laboratories in China / 环境与健康杂志

Objective To understand the testing capability for organochlorine pesticides of the food inspection labs in China. Methods The CNCA organized the proficiency testing(PT) of determination of heptachlor, aldrin and dieldrin in the vegetable oils. 21 labs from 14 provinces (cities) took part in the PT. The GC method prescribed by official method of AOAC was recommended, other method was also permitted. Results The PT showed that 81.0%-85.7% labs presented satisfactory results, 9.5% had questionable results and 4.8%-9.5% had dissatisfactory results. Conclusion Most of the labs that took part in the PT have good competence in analyzing organochlorine pesticides.