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In addition to certificated reference materials, many instrument manufacturers also introduced the general reference materials (or working standard materials), which are used for the verification of instrument repeatability, reproducibility and even accuracy, and to evaluate the signal value on the photo-detector, the effect of the dispenser, and for the test trainings. Working standard materials mostly show wide size distribution and are close to the actual samples. They should possess properties including physical & chemical stability, good dispersability, hydrophilic, and low hydroscopic. In addition, the working standard materials should be packed in glass bottles, sealed, and stored at normal room temperature.

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