Determination of Organic Halides in Textiles by Ion Chromatography Method with High Temperature Combustion and Water Vapor Absorption

KeyWord:organic halides  ion chromatography  textiles  high temperature combustion  water vapor absorption

Abstract:

      A new method was developed for the simultaneous determination of organic fluorine£¬organic chlorine£¬organic bromine and organic iodine compounds in textiles by ion chromatography with high temperature combustion and water vapor absorption£®The samples were firstly oscillated to remove the inorganic halides in textiles£¬then burned£¬cracked and gasified with a new type of high temperature combustion absorption device in temperature programmed heating mode£®The produced free halogen and hydrogen halide gases were absorbed with water vapor£¬and completely transformed into inorganic halogen anions£®After condensation and collection£¬they were separated and determined by ion chromatography and quantified by external standard method£®In the experiment£¬the pre-treatment conditions were optimized£¬including the sample weight£¬the combustion method£¬the combustion gas and its flow rate£¬the water evaporation and the condensate collection method£®In addition£¬the analytical conditions for ion chromatography such as column£¬column temperature and the flow rate of eluent were also optimized£®The results showed that the method was linear in the concentration range of 0.02£­10 mg/L for the standard solutions of fluorine£¬chlorine£¬bromine and iodine ions£¬and the correlation coefficients£¨r2£© were greater than 0.999£®The limits of quantitation were both 1.0 mg/kg for organic fluorine and organic chlorine£¬2.5 mg/kg for organic bromine and 5.0 mg/kg for organic iodine£®The negative textile samples of cotton and polyester were used as the sample matrixes£¬and typical organic halides were selected for the standard addition and recovery£®The average recoveries for organic halides in cotton and polyester at spiked levels of 5£¬50£¬200 mg/kg were in the ranges of 86.6%£­100% and 85.4%£­99.6%£¬with their relative standard deviations£¨RSD£¬n = 7£© of 2.3%£­5.6% and 1.9%£­5.7%£¬respectively£¬indicating that the method had good recovery and precision£®This method was used in the determination of different contents of organic fluorine£¬organic chlorine and organic bromine in actual textile samples with good repeatability£®The established method overcomes the problems of incomplete combustion and absorption£¬and low recovery existing in conventional combustion methods£®With the advantages of high accuracy£¬sensitivity and good repeatability£¬the method is suitable for the determination of organic halides in textiles£¬and provides a reference for the establishment of standard and the quality and safety control of textiles in China£®