Czasopismo | GAZ, WODA I TECHNIKA SANITARNA | Rocznik 2024 - zeszyt 5

Comparison of storage stability of hydrogen sulfide in Tedlar bags in different sampling temperatures

Porównanie stabilności przechowywania siarkowodoru w workach tedlerowych w różnych temperaturach pobierania próbek

10.15199/17.2024.5.3

nr katalogowy: 148829
10.15199/17.2024.5.3

Streszczenie

The purpose of this study was to investigate the stability of storage losses of hydrogen sulphide in Tedlar sampling bag materials at different sampling temperatures (between 4°C and 37°C). Conditions of samples storage were as follows: 20°C storage temperature, exterior relative humidity – 40%, without any light exposure. After first 8 hours of H2S storage, two groups of sampling temperature ranges were distinguished – with more than 50% reduction (range of sapling temperatures from 13°C to 20°C) and with less than 50% reduction of hydrogen sulfide concentration (temperatures between 4°C and 13°C and from 23°C to 37°C). This trend continued up to 25 h and 29 h when the reduction of the hydrogen sulfide concentration became greater than 50% (the temperatures, respectively, 13-14°C and 15-17°C). The highest reduction of H2S was observed for the extreme temperatures (4-6°C and 37-38°C), with the biggest differences between sampling and storage temperature values. Present study draw attention to the temperature as an important factor (between i.a. humidity and pressure) which should be considered not only during the storage, but also in the sampling phase of air analysis. Difference between temperature in both phases can cause important changes in compound concentrations.

Abstract

Celem badania było zbadanie stabilności oraz strat stężenia siarkowodoru podczas przechowywania w workach Tedlarowych, w różnych temperaturach pobierania próbek (pomiędzy 4°C i 37°C). Warunki przechowywania próbek były następujące: temperatura przechowywania: 20°C, wilgotność względna na zewnątrz: 40%, brak ekspozycji na światło. Po pierwszych 8 godzinach przechowywania H2S, wyróżniono dwie grupy zakresów temperatur pobierania próbek – z ponad 50% redukcją (zakres temperatur od 13°C do 20°C) i z mniej niż 50% redukcją stężenia siarkowodoru (temperatury od 4°C i 13°C oraz od 23°C do 37°C). Trend ten utrzymywał się do 25 h i 29 h, kiedy redukcja stężenia siarkowodoru przekroczyła 50% (temperatury odpowiednio 13-14°C i 15- 17°C). Największą redukcję siarkowodoru zaobserwowano w skrajnych temperaturach (4-6°C oraz 37-38°C), przy największych różnicach między wartościami temperatury pobierania próbek i przechowywania. Niniejsze badania zwracają uwagę na temperaturę jako ważny czynnik (pomiędzy innymi wilgotnością i ciśnieniem), który powinien być brany pod uwagę nie tylko podczas przechowywania, ale także w fazie pobierania próbek do analizy powietrza. Różnica między temperaturą w obu fazach może powodować istotne zmiany w stężeniach związków.

Słowa kluczowe

Keywords

Bibliografia

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