Standard Test Methods for Rubber from Natural Sources—Chemical Analysis subscription-only The combined sulfur dioxide is

The combined sulfur dioxide is subsequently determined by iodometric titration after alkaline hydrolysis

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BS EN 1303 establishes details on cylinders suitable for use on fire-resistant or smoke control doors

but which opens to admit air if there is a sub-atmospheric pressure at the water inlet or when the flow stops and closes to be watertight when the flow of water is resumed at normal pressure

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Standard Test Methods for Rubber from Natural Sources—Chemical Analysis subscription-only The combined sulfur dioxide is