Abstract
The ability of Nalophan sampling bags to store volatile sulphur compounds with regard to different storage times as described by current regulations was evaluated in this study. Among the seven volatile sulphur compounds evaluated, hydrogen sulphide, methyl mercaptan, and carbon disulphide were detected to have a high permeation rate. Similar trends were obtained for each sulphur compound detected, with the global concentration, molecular size and molecular structure the main factors responsible for the permeation capacity. Moreover, the proportionality of the global losses of volatile sulphur compounds (VSCs) was demonstrated with high determination coefficients of 0.97–0.99. The highest loss of compounds was found to be during the first 4–5 h of storage. At 30 h of storage, the overall loss reached 10%, with hydrogen sulphide (H2S) and methyl mercaptan (methyl-SH) being the most permeable compounds, followed by carbon disulphide (CS2). For longer storage times, the losses continued, reaching 25% mass loss at 95 h, and H2S was found to be the sulphur compound with the highest permeation rate. Finally, valves used to collect gaseous samples had a negative influence on the loss of compound due to the adsorption effect, showing a loss of 1–2%.
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