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Method for detecting residual quantity of dibromochloropropane and 1, 3-dichloropropene in vegetables and fruits by gas chromatography-mass spectrometry

A technology of dibromochloropropane and dichloropropene is applied in the detection field of pesticide residues, can solve problems such as low detection limit, and achieve the effects of low detection limit, high sensitivity and strong selectivity

Pending Publication Date: 2020-11-24
山东寿光检测集团有限公司
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Problems solved by technology

The lack of detection methods for these two substances, in order to ensure the safety of fruit and vegetable eaters and avoid international trade disputes, it is urgent to establish a method that is simple and fast, has higher accuracy and sensitivity, and lower detection limits, and is suitable for all kinds of vegetables. Detection of "black drugs" in fruits

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  • Method for detecting residual quantity of dibromochloropropane and 1, 3-dichloropropene in vegetables and fruits by gas chromatography-mass spectrometry
  • Method for detecting residual quantity of dibromochloropropane and 1, 3-dichloropropene in vegetables and fruits by gas chromatography-mass spectrometry
  • Method for detecting residual quantity of dibromochloropropane and 1, 3-dichloropropene in vegetables and fruits by gas chromatography-mass spectrometry

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the examples, but the present invention is not limited to the specific examples.

[0026] In the present invention, unless otherwise specified, all equipment and raw materials can be purchased from the market or commonly used in this industry. The methods in the following examples, unless otherwise specified, are conventional methods in this field.

[0027] Instrument: GC-MS / MS 7000D GC / MS (Agilent, USA); 7697A headspace sampler: with headspace vial, sealing gasket, cap (Agilent, USA); 20mL headspace sampling vial; element type 1815D ultra Pure water instrument (Molecular); YP10002 electronic balance (Yuyao Jinnuo balance instrument).

[0028] Reagents: dibromochloropropane (Acstandard, 1000ng / L), cis / trans-1,3-dichloropropene (Acstandard, 1000ng / L). Sodium chloride (NaCl): superior grade, ignited in a muffle furnace at 500°C for 2 hours, cooled to room temperature in a desiccator, and ...

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Abstract

The invention discloses a method for detecting residual quantity of dibromochloropropane and 1, 3-dichloropropene in vegetables and fruits by gas chromatography-mass spectrometry. The method comprisesthe following steps: pretreatment, headspace (HS) sample introduction, GC-MS / MS (Gas Chromatography-Mass Spectrometry-Mass Spectrometry) determination and quantification by an external standard method. According to the method, the detection limit of dibromochloropropane is as low as 0.4 mu g / kg, the recovery rate is 87.08%-104.86%, and the RSD value is 5.28%-8.29%; the detection limit of 1, 3-dichloropropene is as low as 2 mu g / kg, the recovery rates of cis / trans isomers are 88.82%-119.45% and 87.20%-116.55% respectively, and the RSD values are 3.49%-8.14% and 1.15%-9.72% respectively. The method is easy to operate, environment-friendly, high in sensitivity and good in reproducibility.

Description

technical field [0001] The present invention relates to a method for detecting pesticide residues, more specifically, to a method for detecting residues of dibromochloropropane and 1,3-dichloropropene in vegetables and fruits by gas chromatography, which belongs to the detection of pesticide residues technology field. Background technique [0002] Dibromochloropropane, scientific name 1.2-dibromo-3-chloropropane (abbreviation: DBCP), CAS: 96-12-8, chemical formula is C 3 h 5 BrCl, the molecular weight is 236.32. It is a liquid fumigation insecticide and nematicide, suitable for fumigation of seedbeds and greenhouses of vegetables, flowers, tobacco, strawberries and other crops, to control root-knot nematodes, cyst nematodes, short-body nematodes, spiral nematodes, nematodes, and dwarf nematodes. Nematodes, etc. are pesticides that are explicitly prohibited by the Ministry of Agriculture. 1,3-dichloropropene, the chemical formula is C 3 h 4 Cl 2 , with a molecular weig...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06G01N30/30G01N30/32G01N30/72G01N30/86
CPCG01N30/02G01N30/06G01N30/30G01N30/32G01N30/72G01N30/8675G01N2030/324
Inventor 李晓林李俊青王鲁
Owner 山东寿光检测集团有限公司
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