Method for detecting aldehyde ketone concentration in atmosphere through combination of DNPH-silica-gel adsorption small columns and HPLC-UV

Abstract

The invention relates to a method for detecting aldehyde ketone concentration in the atmosphere through combination of DNPH-silica-gel adsorption small columns and a HPLC-UV. The method comprises the following steps: (1) a sampling efficiency experiment: connecting two DNPH-silica-gel adsorption small columns in series, connecting the combined small columns with a sampling pump, and collecting an aldehyde ketone gas sample of which the concentration is known; (2) an atmosphere collection experiment: connecting a flowmeter, a potassium iodide copper pipe, the DNPH-silica-gel adsorption small columns and the sampling pump in sequence, so as to collect an aldehyde ketone gas sample in the ambient air; (3) sample treatment and analysis: slowly flushing the collected samples with acetonitrile, quantifying with a volumetric flask, and then carrying out detection through the HPLC-UV. The method has the advantages that the sampling efficiency can be 99 percent or above, the replicate analysis standard deviation of experiment data is less than 5 percent, the detection limit is as low as 0.05 to 0.15 microgram / m<3>, the detection accuracy is 3.01 to 9.65 percent, and the method is high in practicability.

Description

technical field [0001] The invention relates to an analysis and detection method for the concentration of aldehydes and ketones in the atmosphere, in particular to a method for detecting the concentration of aldehydes and ketones in the atmosphere by using a DNPH-silica gel adsorption column combined with HPLC-UV. Background technique [0002] DNPH (2,4-Dinitrophenylhydrazine) is a widely used derivatizer in the quantitative detection and analysis of atmospheric aldehydes and ketones. It is not volatile itself, and can quickly react with aldehydes and ketones to form a stable product, phenylhydrazone. At present, in the laboratories of domestic environmental monitoring research institutions, in order to save expenses and costs, semi-commercial self-made DNPH-silica gel adsorption tubes are often used to collect and analyze the concentration of atmospheric aldehydes and ketones. The shortcomings of high tube blank content, unstable sampling efficiency, and short shelf life of...

AI Technical Summary

Problems solved by technology

At present, in the laboratories of domestic environmental monitoring research institutions, in order to save expenses and costs, semi-commercial self-made DNPH-silica gel adsorption tubes are often used to collect and analyze the concentration of atmospheric aldehydes and ketones. Disadvantages of high tube blank content, unstable sampling efficiency, and short shelf life of adsorption tubes (generally 1 to 4 weeks)

Recently, Waters has launched a commercial DNPH-silica gel cartridge (Sep-Pak Silica Gel Cartridge, Millipore Co.) on the market. However, the DNPH-silica gel cartridge used in environmental detection combined with HPLC-UV What is the effect of the concentration of atmospheric aldehydes and ketones? So far there is no specific data report and explanation.

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