A method for separating and enriching triazine pesticides in large volume water samples
A technology for separation and enrichment of triazines, applied in material separation, analysis of materials, instruments, etc., can solve problems such as insufficient extraction capacity and extraction capacity, achieve high extraction and enrichment capacity, good fluidity, and strong adsorption Effect
Active Publication Date: 2020-10-09
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the limitation of insufficient extraction ability and extraction capacity of the existing integral column solid phase extraction technology, and provide a method for separating and enriching triazine pesticide residues in large-volume water samples
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[0019] In order to further explain the technical means and effects that the present invention takes to achieve the intended purpose of the invention, below in conjunction with the accompanying drawings and preferred embodiments, a new type of adsorption and enrichment of trace triazines in large-volume farmland water samples proposed according to the present invention The specific implementation methods, steps, characteristics and effects of the method and application of the pesticide-like pesticide are described in detail below.
[0020] (1) Preparation of carbonized PVP / GO-AAm-DVB monolithic column:
[0021] First, DVB and Span80 are added into the sample tube according to the volume ratio of 5:2, and mixed evenly to form an organic phase; the PVP / GO aqueous solution with a concentration of 5mg / mL is prepared, and acrylamide (AAm) is added to make the concentration of AAm is 22.2mg / mL, then add K 2 S 2 o 8 solid, make K 2 S 2 o 8 The concentration is 11.1mg / mL to form ...
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The invention discloses a method for separation and enrichment of a triazine pesticide in a large-volume sample. The method is characterized in that a carbonized integral column is formed by employinga carbonized high-inner phase emulsion polymer, wherein a volume ratio of DVB to Span80 is 5:2, the water-phase volume percentage is 85%-90%, and carbonization is carried out for 2 hours at the temperature of 600 DEG C; through the carbonized integral column, the trace-quantity triazine pesticide in the sample is subjected to separation and enrichment, an acetonitrile aqueous solution with volumepercentage being 5% is employed for cleaning the carbonized integral column, a triazine pesticide target object is relieved by employing the acetone and n-butyl alcohol according to a volume ratio being 1:1, and a relieving solution is collected; nitrogen blow-drying is carried out on the relieving solution, acetonitrile is used for remelting to obtain a to-be-measured solution, and separation and enrichment on the triazine pesticide in a farmland sample can be completed. The prepared PVPV / GO-AAm-DVB integral column has the characteristics of three dimensional multihole, large surface area, and strong adsorption capability, and has high extraction and enrichment capability on the triazine pesticide.
Description
technical field [0001] The invention belongs to the technical field of analytical chemical sample pretreatment, and in particular relates to a method for separating and enriching triazine pesticides in large-volume water samples. The method prepares a carbonized monolithic column with strong extraction and enrichment capabilities and high multiples. It is used for the enrichment, separation and detection of triazine pesticide targets in environmental farmland water samples. Background technique [0002] Triazine pesticides are widely used to prevent weeds in farmland. Its structure has a six-membered ring structure parent with 3 carbons and 3 nitrogens arranged symmetrically. The thio group is connected to be net, and the methoxy group is connected to be connected. Since triazine pesticide herbicides are used in a large amount, their performance is relatively stable, and their residual time is long, they may cause pollution to soil, crops, surface water and other drinking w...
Claims
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IPC IPC(8): G01N30/08
CPCG01N30/08
Inventor 阮贵华李先先杜甫佑
Owner GUILIN UNIVERSITY OF TECHNOLOGY