Method for combining technologies of polymer carbon nano tube chromatographic column and ion chromatographic column switching
An ion chromatographic column and carbon nanotube technology, which is applied in the field of polymer carbon nanotube chromatographic column and ion chromatographic column switching technology. Realize, increase analysis cost and other issues, achieve the effect of shortening time, saving analysis time, and simple method
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Embodiment 1
[0044] The production process of the polymer carbon nanotube composite chromatographic filler is as follows, and the steps are:
[0045] (1) Synthesize 1.8 μm monodisperse polystyrene seed by dispersion polymerization method earlier, monomer concentration is 20%, stabilizer concentration is 3%, initiator consumption is 4% of monomer, and reaction medium is 95% ethanol aqueous solution, The reaction temperature was 70°C, the stirring speed was 250 rpm, and the reaction time was 24 hours.
[0046] (2) 50 mg of multi-walled carbon nanotubes were oxidized with 200 mL of concentrated sulfuric acid / concentrated nitric acid=3:1 (v / v) mixed acid solution, ultrasonicated at 35° C. for 6 hours, washed until neutral and then dried. Then, monodisperse polystyrene-divinylbenzene-carbon nanotube composite microspheres with a crosslinking degree of 55% were prepared by seed swelling method. The concentration of the monomer is 10%, the content of carbon nanotubes accounts for 1% of the monom...
Embodiment 2
[0049] The specific detection steps of polymer carbon nanotube composite chromatography combined with ion chromatography are as follows:
[0050] (1) Set the system according to figure 2 Connected. The first pump 1 is connected to the first six-way valve 3; the enrichment column 10 is connected to the second six-way valve 4; the second six-way valve 4 is connected to the guard column 11, ion exclusion column 12, waste liquid bottle 7, The pump 2 is connected; the analysis column 12 is connected with the guard column 11 and the suppressor 5 respectively; the suppressor 5 is connected with the analysis column 12 and the conductivity detector 6 respectively; the quantitative loop 8 is on the first six-way valve 3, and the pretreatment The columns 13 are respectively connected with the first six-way valve 3 and the second six-way valve 4 . Pumps 1 and 2 are filled with mobile phase and turned on. The mobile phase of pump 1 is deionized water at a flow rate of 0.65mL / min, and th...
Embodiment 3
[0055] This example is to analyze eight common inorganic anion mixed standard samples using column switching technology
[0056] Instruments used: ion chromatograph; conductivity detector; chromatographic workstation; two six-way valves; chromatographic pump; high-purity nitrogen cylinder; analytical column; guard column; enrichment column; anion self-regeneration suppressor. Pretreatment column: use the polymer carbon nanotube composite filler in Example 1 to fill in a 4.6×150mm stainless steel column.
[0057] Eluent: analytical column eluent: 4.5mM Na 2 CO 3 and 0.8mM NaHCO 3 , the flow rate is 1.0mL / min; polymer carbon nanotube pretreatment column eluent: H 2 O, the flow rate is 0.65 mL / min.
[0058] Analysis steps:
[0059] (1) Baseline surveying and mapping
[0060] The eluent is pumped into the chromatographic separation column to achieve equilibrium, and the eluent output from the chromatographic separation column is converted into an electrical signal by the con...
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