This British Standard is an adoption of an ISO standard. You can access the ISO version here.
ISO 21910 discusses the Characterization of microbubbles for Fine bubble technology. ISO 21910-1 outlines the evaluation method for the size index of microbubbles in microbubble dispersion. It is only applicable to microbubbles with or without shells in water within the range from 1 μm to 100 μm.
ISO 21910-1 describes the sampling methods from the point generating or dispersing microbubbles in the retention container to the detecting point of the measuring instruments.
ISO 21910-1 on Off-line evaluation of size index of microbubbles in water is useful for:
The dynamic nature of microbubbles makes it hard for the users to report their measurement results with confidence. The low stability of microbubbles that includes shrinking, deformation, coalescence, and dissolution of individual microbubbles can require a specific sampling procedure and short measurement time.
ISO 21910-1 guideline provides requirements on measuring instruments, environment, sample transfer, measurement system, procedures, data acquisitions, correction, and evaluation method for size index of microbubbles in water to be used in a measurement laboratory. This ensures reliable results and makes the processing time effective.