Detection of water in the plasticizer removal method and method of ozonation – plasticizers, phthalic acid esters, water treatment – the plastics industry
Plasticizer Be Chemical industry The most common raw material for industry, over time, this material will slowly from Plastic Products The escape into the air, soil, water and even food. DEHP Plasticizer Have been included in the harmful substances. Experts speculate that it may, like other harmful substances, as is food to be eaten by the human body, including water and air may be the main way. The researchers conducted animal experiments show that the material not only teratogenic, carcinogenic and mutagenic, but also affect human hormone systems, particularly the development of youngsters, Testicular growth and development of boys is very unfavorable. Have been classified as environmental hormones (endocrine disruptors or environmental hormones), for which the EU will affect the biological reproduction to include hazardous substances [2]. Commonly used plasticizers are phthalate esters and fatty acid esters of binary [1], in particular phthalic acid esters ( PA Es) as a plasticizer addition to the main, but also used in rubber, pesticide, polymer additives, Paint , Printing, cosmetics and perfume production. Ozone is a broad-spectrum, highly efficient disinfectant, oxidation strong, quick response, and oxidative decomposition of water to a higher hydroxyl radical (OH?, E = 2.80V), on the organic removal significant. In this paper, macroporous resin enrichment and GC-MS method (GC / MS) method on the water in the presence of plasticizer was analyzed before and after ozonation compared the changes in water plasticizer.
1 experiment 1.1 Instruments and reagents
Ozone generator (XFZ-5, Tsinghua University, with benefits), PH meter (Delta320, on Haara magnetic Instrument Factory), Soxhlet extractor, KD concentrator.
Sodium thiosulfate, potassium iodide, anhydrous sodium sulfate, dichloromethane (HPLC grade), acetone (chromatography pure), ethanol (chromatography pure), HPD-600 and HPD-300 macroporous resin, laboratory glassware were washed with the lotion soak.
1.2 Chromatographic conditions Using detection equipment: GC / MS (6890NGC/5973MS, AgilentTechnologies), quartz capillary column (30m × 0.25mm × 0.25 m).
Of conditions: temperature program, the early temperature 60 , 2min after injection to 5 / min rate of heating to 270 , temperature at 180 , carrier gas was high purity helium, gas flow 1mL/min.
MS conditions: ion source Electronic Bombardment energy 70eV, scan range of 40 ~ 350M / Z, scanning voltage 1.60kV. Identification of organic compounds using NIST107 and NIST21 standards.
1.3 Preparation of enrichment column
HPD-600, and HPD-300 macroporous resin to two 1:1 mixture of ethanol in Soxhlet extractor extract mixed resin 8 hours, then wet into 1.5cm diameter glass column, the column height 12cm , distilled water leaching resin 4 hours after the ethanol wash all the spare.
2 Methods and Results 2.1 Water treatment
As the concentration of water in the plasticizer in the g / L of magnitude, it must be enriched, the enrichment process can be analyzed after the test. Take water 20L, water samples to a certain velocity (about 10ml/min) through the enrichment column, and then dried with high purity nitrogen enrichment column, chromatographic pure grade acetone and dichloromethane 15mL leaching the resin, with anhydrous Na2SO4 dehydration on the eluate, the final eluate concentration by using the KD to less than 1mL, concentrated samples tested placed in the refrigerator for safekeeping.
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