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You don't need to stop anything to fill a sample bottle.

>Ventilation is a huge problem - H2S emits a very foul smell.

H2S also deadens the olfactory nerves, or something to that effect so that one does not notice if the concentration increases gradually.

>You don't need to stop anything to fill a sample bottle.

Gotcha. I had trouble reaching people who were willing to do sampling, which led me to that conclusion.

>H2S also deadens the olfactory nerves

Going back to check my ventilation right now, haha. From what I know, the scent disappears only above concentrations in air of ~150-200ppm.