阅读说明：本技术 一种检测塑料中邻苯二甲酸酯类最优提取试剂的选择方法 (Selection method for optimal extraction reagent for detecting phthalate in plastic ) 是由 梁茜茜 于 2019-11-29 设计创作，主要内容包括：本发明涉及化学检测技术领域,具体涉及一种检测塑料中邻苯二甲酸酯类最优提取试剂的选择方法。主要技术方案如下：(1)取等量的待检测物质分别溶解于不同的溶剂中,得到浓度为0.1g/mL的待测液；(2)将待测液通过离子迁移谱方法进行检测；分析各组检测结果数值与实际给出的定量的差异,以差异最小的组使用的溶剂为最优试剂；所述的溶剂为乙醇、正己烷、甲醇和丙酮。本发明采用无毒、成本低、溶解性好的乙醇作为有机溶剂,对塑料中邻苯二甲酸酯类化合物进行检测,检测结果准确,快速,高效。(The invention relates to the technical field of chemical detection, in particular to a selection method of an optimal extraction reagent for detecting phthalate esters in plastics. The main technical scheme is as follows: (1) dissolving equivalent substances to be detected in different solvents respectively to obtain a solution to be detected with the concentration of 0.1 g/mL; (2) detecting the liquid to be detected by an ion mobility spectrometry method; analyzing the difference between the detection result values of all groups and the actually given quantification, and taking the solvent used by the group with the minimum difference as the optimal reagent; the solvent is ethanol, n-hexane, methanol and acetone. The method adopts nontoxic, low-cost and good-solubility ethanol as an organic solvent to detect the phthalate compounds in the plastics, and has accurate, rapid and efficient detection result.)

1. A selection method for detecting an optimal extraction reagent of phthalate in plastic is characterized by comprising the following steps:

(1) dissolving equivalent substances to be detected in different solvents respectively to obtain a solution to be detected with the concentration of 0.1 g/mL;

(2) detecting the liquid to be detected by an ion mobility spectrometry method; analyzing the difference between the detection result values of all groups and the actually given quantification, and taking the solvent used by the group with the minimum difference as the optimal reagent;

the solvent is ethanol, n-hexane, methanol and acetone.

2. The method for selecting the optimal extraction reagent for detecting the phthalates in the plastic according to claim 1, wherein the parameters adopted in the ion mobility spectrometry method are as follows: the temperature of the thermal analysis sample injector is 180 ℃, the temperature of the ion migration tube is 130 ℃, and the electric field intensity of the migration zone is 220V/cm.

Technical Field

The invention relates to the technical field of chemical detection, in particular to a selection method of an optimal extraction reagent for detecting phthalate esters in plastics.

Background

In recent years, with the mass production and use of plastic products, phthalates have become the most common class of contaminants worldwide. In view of the many hazards of phthalates, the united states, european union, etc. have continued to set forth several environmental regulations restricting their use, and the united states Environmental Protection Agency (EPA) has placed 6 PAEs on a list of heavily regulated pollutants. Recently, the U.S. environmental protection agency has placed phthalates on the list of specialty materials with "serious health or environmental concerns" in the first chemical action program, in accordance with the existing toxic materials control act (TSCA). China is one of the main countries for producing and using PAEs, and the annual output of the PAEs exceeds 200 ten thousand tons. With the increasing use of PAEs, the pollution caused by PAEs is not negligible. The 'perfume toxic' event reminds people that PAEs threaten our life health at any moment. In the aspect of packaging food and daily chemical products, the PAEs are particularly applied as plasticizers of flexible plastics, and various plastic boxes and plastic bags contain the PAEs. The PAEs and the plastic matrix do not form chemical covalent bonds, so that the PAEs can be dissolved out when contacting water, grease and the like contained in the packaged food, and the food is polluted. Therefore, the development of a new phthalate detection technology which is rapid and highly sensitive and is suitable for rapid screening of a large number of samples has important significance for researching the pollution current situation of phthalate substances in China, planning the use and management of phthalate and protecting the life health of people.

Disclosure of Invention

In order to make up the defects of the prior art, the most suitable extracting agent is screened by comparing the types and the contents of the dissolved PAEs of the plastic packaging materials (No. 1 PTE) by the several extracting solvents. The technical scheme of the invention is as follows: a selection method for detecting an optimal extraction reagent of phthalate in plastic comprises the following steps:

(1) dissolving equivalent substances to be detected in different solvents respectively to obtain a solution to be detected with the concentration of 0.1 g/mL;

(2) detecting the liquid to be detected by an ion mobility spectrometry method; analyzing the difference between the detection result values of all groups and the actually given quantification, and taking the solvent used by the group with the minimum difference as the optimal reagent;

the solvent is ethanol, n-hexane, methanol and acetone.

Further, the parameters adopted in the ion mobility spectrometry method are as follows: the temperature of the thermal analysis sample injector is 180 ℃, the temperature of the ion migration tube is 130 ℃, and the electric field intensity of the migration zone is 220V/cm.

The invention has the following beneficial effects: the method takes ammonia as a reagent molecule to detect the phthalate ester compounds in trace amount in food, can simultaneously detect various phthalate ester compounds, and has the characteristics of high efficiency, accuracy and rapidness. The ethanol is used as a solvent, and has the characteristics of no toxicity, low irritation, low cost and good solubility.

Drawings

FIG. 1 is an ion mobility spectrum of a phthalate detection dissolved out from a plastic with ethanol as an extractant;

FIG. 2 is an ion migration spectrum of phthalate in plastic dissolved out by n-hexane as an extractant;

FIG. 3 is an ion migration spectrum of phthalate in plastic dissolved out by methanol as extractant;

FIG. 4 is an ion migration spectrum of phthalate dissolved out of plastic by acetone as extractant;

FIG. 5 is a graph showing the migration time with the temperature of the migration tube;

FIG. 6 is a graph of response intensity versus temperature of a migration tube;

FIG. 7 is a graph showing the migration time along with the variation of the electric field intensity of the migration tube;

FIG. 8 is a graph showing the response intensity along with the variation of the electric field intensity of the migration tube;

FIG. 9 is a graph of response intensity versus injector temperature;

FIG. 10 is a graph showing the results of detection in example 2.

Detailed Description

The invention is further described with reference to specific embodiments, and unless otherwise indicated, the materials and equipment used in the invention are conventional in the art.