Abstract: Phthalates, also known as phthalates, abbreviation PAE, is a general term for esters formed from phthalic acid. When used as a plasticizer for plastics, it generally refers to an ester of phthalic acid and a 4-15 carbon alcohol. Phthalates are a class of chemicals that can soften. It is widely used in hundreds of kinds of toys, food packaging materials, medical blood bags and hoses, vinyl floors and wallpapers, cleaners, lubricants, personal care products (such as nail polish, hair sprays, soaps and shampoos). Products. Experts have found that phthalate-containing soft plastic toys and children's products may be put into the mouth by children. If they are left for a long enough time, the dissolution of phthalate will exceed the safe level and will be harmful. Children's liver and kidney can also cause precocious puberty in children. Directive 2005/84 / EC of the European Union requires that all toys or child care products containing DEHP, DBP, and BBP concentrations exceeding 0.1% must not be sold in the EU market; for toys and child care plastics that can be placed in imports The other three phthalates (DINP, DIDP and DNOP) contained are restricted, and the concentration must not exceed 0.1%. At present, China has no clear regulations on the content of this substance. This method uses high-performance liquid chromatography to simultaneously detect 5 kinds of phthalate esters, simple operation, and rapid analysis. ◆ Analysis conditions Instruments: P5000 high-pressure constant flow pump, UV5000 ultraviolet detector, N2000 workstation chromatographic column: Vertex AQ-C18 5µm 4.6 × 150mm Mobile phase: methanol-water-(90:10) Flow rate: 1.0mL / min Detection wavelength: 230nm Injection volume: 20μL ◆ Sample processing Preparation of test solution: Precisely weigh 0.1000g of plastic toy cut into thin slices, add 100ml to a conical flask with stopper Chloromethane, place for 24h, ultrasonic extraction, filter the extract through a funnel containing 3g of anhydrous sodium sulfate to a 100ml volumetric flask, dilute to 100ml with dichloromethane, draw 10ml of solution from it, and blow to near After drying, dissolve the volume with methanol to 5ml, filter through 0.45μm filter membrane and inject. Preparation of reference solution: Weigh 0.1000g each of DMP, DBP, DAP, DEHP and DCHP reference solutions, dissolve and dilute with methanol to a 100ml volumetric flask, prepare 1mg / ml standard mother liquor, and store in dark place . ◆ Spectrum Standard product chromatograms 1-DMP, 2-DBP, 3-DAP, 4-DEHP, 5-DCHP ◆ Results and discussion Using this method to conduct a sample survey of commercially available toys, the results show that there are certain environmental hormones in plastic toys, It deserves high attention from society. The method has high sensitivity, good reproducibility and easy operation, and is also suitable for the detection of phthalate environmental hormones of other plastic products.
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RP-HPLC detection of phthalates in plastic toys