Abstract:

In order to solve the problems of long extraction time, volatilization of ether, environment pollution and poor result accuracy during the extraction of 4- aminoazobenzene, the acetonitrile-salt aquatic two phase system was established, and an environment-friendly and efficient sample treatment method was developed for detection of 4- aminoazobenzene in textiles. Based on phase capability difference of inorganic salts, several common salts on the phase separation in acetonitrile – water were examined. According to the extraction rate, mass fraction of NaOH, dosage of organic, researched recovery ratio of acetonitrile and 4- aminoazobenzene,  the optimum system for extraction of 4- aminoazobenzene was screened. The result show acetonitrile-potassium carbonate is the optimum system,  which is 2% sodium hydroxide solution 10 mL, acetonitrile 4 mL and anhydrous potassium carbonate 4.0 g. The liner range is 0～20 mg/kg with correlation coefficient of 0.999 9. Limit of detection is 0.036 mg/kg. Recovery rate of 4- aminoazobenzene is 89.71%~101.6%. relative standarddeviation (RSD) is 1.40%~3.86%. Extraction rate of acetonitrile is  96.25%~101.00%, RSD is 0.63%~1.27%

Key words: 4-aminoazobene, aqueous two phase system, recovery rate, exraction rate,  acetonitrile, potassium carbonate