Magnetic-nano-composite-based dispersive solid-phase extraction-chromatographic detection method of malachite green (MG) and crystal violet (CV) in water sample
A nano-composite and dispersed solid-phase technology, which is applied in the direction of measuring devices, material separation, and material analysis, can solve the problems of time-consuming liquid-liquid extraction, cumbersome solid-phase extraction, and long extraction time, and achieve high sensitivity High, improved sensitivity, simple processing effect
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[0015] Example 1
[0016] Add 0.05mL to the colorimetric tube with a concentration of 2.68mg mL -1 Fe 3 O 4 / GO nanocomposite, 0.02mL10mg L -1 MG and CV mixed standard solution, pH 6.0 ammonium acetate buffer or water sample (water sample is filtered with 0.45μm filter membrane and adjusted to pH 6.0) 19.93mL, react at room temperature for 15min. After the reaction solution is separated into solid and liquid phases with a magnet, the clear liquid is discarded. The magnetic solid was eluted with 200μL of acetonitrile / glacial acetic acid (V:V=4:1) eluent ultrasonically, separated by a magnet, filtered with a 0.45μm filter, and 20μL of the solution was measured on a high performance liquid chromatograph for absorbance (The detection wavelength is at 600nm). According to the absorbance of the water sample and the standard series, the content of MG and CV in the water sample is calculated.
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[0017] Example 2
[0018] Add 0.1mL to the colorimetric tube with a concentration of 2.68mg mL -1 Fe 3 O 4 / GO nanocomposite, 0.02mL10mgL -1 MG and CV mixed standard solution, pH 5.0 ammonium acetate buffer or water sample (water sample is filtered with 0.45μm filter membrane and adjusted to pH 5.0) 19.88mL, react at room temperature for 15min. After the reaction solution is separated by a magnet, the clear solution is discarded. The magnetic solid is eluted with 200μL of acetonitrile / glacial acetic acid (V:V=4:1) eluent ultrasonically, separated by a magnet, and filtered by 0.45μm. After head filtration, take 20μL of the solution for absorbance measurement on a high performance liquid chromatograph (detection wavelength is 600nm), and calculate the content of MG and CV in the water sample based on the absorbance of the water sample and the standard series.
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