On the verification of stability and sensitivity of the gas-liquid chromatography method in the st. Petersburg environmental monitoring system for measuring formaldehyde mass concentrations in the ambient air

M.V. Volkodaeva1, V.A. Kuznetsov2, Y.A. Volodina3

Saint-Petersburg Mining University, RF, Saint-Petersburg, 21-st Line, 2

E-mail: m.volkodaeva@yandex.ru1, 19vlad9494@mail.ru2, yana-ilyina@mail.ru3

DOI: 10.33075/2220-5861-2020-1-37-45

UDC 504.064.3

Abstract:

     Formaldehyde is one of the pollutants that have a negative effect on human health and, as a result, are among those measured during the ambient air monitoring in St. Petersburg. To determine formaldehyde concentrations, instruments are used whose operating principle is based on the optical method. But this method has certain disadvantages.

     These disadvantages complicate the process of obtaining high-quality and stable results of the environmental monitoring. In this regard, a number of experiments were carried out using various methods: background formaldehyde concentrations were measured, as well as predetermined ones (obtained using a microflow source). The results of formaldehyde determination with using a Picarro G2107 gas analyzer and a FGH-1-2 chromatograph were grouped around a mathematical expectation, which proved the stability of measurements.  However, concentrations measured with a gas analyzer did not satisfy stated metrological characteristics. Studies showed that the optical method was not able to determine small concentrations of formaldehyde due to its low sensitivity; while at high concentrations, the gas analyzer showed better results. According to the research, the method of gas-liquid chromatography demonstrated the stability and quality of measurements in determining both low and high concentrations. Therefore, we can conclude that if all the requirements are met, this method guarantees the correctness of the information obtained.

     The results of further experiments showed the need of storage and transportation of formaldehyde samples in the refrigerator, which is related to the peculiarities of the behavior of the substance at room temperature.

Keywords: formaldehyde, atmospheric air, method, microflow, portable gas chromatograph, environmental monitoring, chromatography, chromatogram.

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[IEEE] M. V. Volkodaeva, V. A. Kuznetsov, and Y. A. Volodina, “On the verification of stability and sensitivity of the gas-liquid chromatography method in the st. Petersburg environmental monitoring system for measuring formaldehyde mass concentrations in the ambient air,” Monitoring systems of environment, no. 1, pp. 37–45, Mar. 2020.

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