Breathe inslowly, and make the piston rise as high as you can while you keep the indicator between two arrows to know you are inhaling at the right pace. Then hold your breath for up to 10 seconds. Note where the piston stopped. While you’re holding your breath, it will gradually sin...
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In this method, the gas is sampled using a piston/bellows pump through a glass tube containing a reagent (e.g., lead acetate) which reacts with the species of interest to produce a color that is related to its concentration at a given time [20]. An example of an H2S sensor which ...