Determination Of Organochlorine Compounds In Textiles By Ion Chromotography Detection Method

As a class of persistent organic pollutants, organic halides are causing widespread concern around the world due to its potential risks to human health and environment. TOX is the abbreviation for total organic halides, AOX is the abbreviation for adsorbabel organic halides and AOX belongs to TOX. During the processing and finishing process of textiles, organic halogen compounds are used or produced as some byproducts which left in textiles can be the source of TOX and AOX. Part of TOX and AOX substances are potentially harmful to humans and the environment,which excessively residues in textiles will inevitably cause harm to the human body. On the other hand, with the development of society, people’s sense of eco-textiles is continuing to strengthen. Then different regions and countries also put the appropriate regulations, such as annually updated Oeko-standard100, REACH and CPSIA, etc.,to strictly limited harmful substances in textiles. Establishing the appropriate detection method of TOX and AOX can not only monitor its residual amount in textiles, but also can adapt to the times, reduce trade barriers.More than95%of residual substances of TOX and AOX in textiles are organic chlorine compounds. Therefore, the detection range of the topic will be limited to TOC1and AOC1substances. However, due to the compatibility between the solvent and the detected object, which limited its application.and promotion. Fully oxidizing the organic halogen compounds under aerobic conditons, makeing them inorganic, then absorbing inorganic halides in pure water to form an aqueous solution, furthermore detecting the content of halide ions by ion chromatography. This method can theoretically be applied to all halogen-containing organic compounds, which can overcome the gas chromatography, liquid chromatography detection technology limitations, there it is a more advanced detection technology. This topic takes pentachlorophenyl, pentachlorophenol and tetrachloro-o-xylene as the study objects, selects100μg/L,500μg/L and1OOOμg/L as three diffirent standard additon levels for each object, uses oxygen bomb combustion-ion chromatogrophy to detect the recovery and the stability of the TOC1test method in textiles. The results showed that under three different concentrations of three standard materials,the method all have higher recovery and good re-peatability, recovery rates steady at between75%-108%and the relative standard deviation fluctuated between3%-13%. Take PCP as spiked substance to check the reproducibility of this test method. The results show that: the recovery of the three spiked levels basically stable at80%-108%and relative standard deviations respectively were4.83%,3.92%and10.43%. The results meet the testing requirements.Take PCP as the study objects, use water extraction-activated carbon adsorption-oxygenbomb combustion-Ion chromatography detection method to initially explore the IC detection method and method conditions of AOCl in textiles.The method blank value is between179.1μg/L-227.9μg/L. In30mg/L-150mg/L spiked concentration, compared the recoveries and stability of textiles AOCl ion chromatography detection method and GC/MS detection method. The recoveries of IC detection method is between63%and91%, relative standard deviation <14.1%; GC/MS method’recoveries is80%-95%, relative standard deviation＜6%. The results showed that: AOCl Ion Chromatography method still has low recoveries and the measurement accuracy is greater impacted by the blank value at low concentrations. Therefore, it is necesssary to do futer sutdy on sample pre-treatment, Including activated carbon purification and others blank value interfering factors.