How often should I prepare fresh calibration solutions?

Izon recommends that fresh calibration solutions should be prepared each day. This will minimise the risk of significant particle aggregation, contamination or microbial growth.

The re-dispersion of calibration particles should be repeated at regular intervals during the day. It is recommended that this is done by vortexing the sample in short bursts for 30 seconds. This is particularly important with particles >500 nm in diameter that tend to settle under gravity. Before TRPS measurement all calibrations and samples should be vortexed briefly.