Extraction method of polycyclic aromatic hydrocarbons in abs, pvc, pp, ps products

Abstract

The invention discloses a method for extracting polycyclic aromatic hydrocarbons in ABS, PVC, PP and PS products, which comprises the following steps: a. crushing ABS, PVC, PP and PS products to obtain particle samples; b. weighing predetermined Measure the pulverized particle sample into the headspace sample vial, add the cracking agent, press the cap and ultrasonically form a suspension in a water bath at 55-65°C; c. After removing the cap, measure a predetermined amount of the suspension and drop it slowly to In the extraction container filled with non-polar purifying agent and filled with coagulant for normal phase extraction, after vortex mixing, centrifugal extraction or negative pressure extraction of supernatant; the non-polar purifying agent is n-hexane, methanol, acetonitrile , one or more of petroleum ether, cyclopentane and ether. The extraction method provided by the invention has the characteristics of quickness, simplicity, low cost, less interference, and less loss to instruments.

Description

technical field [0001] The invention relates to the extraction of polycyclic aromatic hydrocarbons in plastic products in the fields of machinery, food, environment, automobiles, and home furnishings; in particular, it relates to a method for extracting polycyclic aromatic hydrocarbons in ABS, PVC, PP, and PS products. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to a series of hydrocarbon compounds that are arranged in a linear, angular or clustered form by two or more benzene rings. Mutagenic and mutagenic persistent organic pollutants have attracted widespread attention because of their stable nature and easy accumulation in organisms. [0003] ABS resin is currently the polymer with the largest output and the most widely used. It organically unifies the various properties of PB, PAN, and PS, and has excellent mechanical properties of toughness, hardness, and rigid phase balance. ABS is a terpolymer of acrylonitrile, butadiene and styrene, ...

AI Technical Summary

Problems solved by technology

These extraction methods have the following deficiencies in specific experimental operations: 1) the Soxhlet extraction method is cumbersome to operate, generally needs to carry out continuous extraction, and the extraction time is long, and the Soxhlet extraction effect of polycyclic aromatic hydrocarbons in plastic products is generally good with 20 to 30 times , and need to use a large amount of toxic organic solvents

Such substances generally have a high content in plastic products, and are the main interference in the qualitative and quantitative determination of polycyclic aromatic hydrocarbons. Usually, this kind of interference cannot be well eliminated by solid-phase extraction purification methods such as silica gel / alumina column. , and the solid-phase extraction purification operation is time-consuming and cumbersome

If the purification process of solid phase extraction is not used for direct sample detection, the sensitivity and service life of the chromatographic column and core components of the instrument will be greatly reduced

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