Quality Assurance Laboratory glassware

1 quality assurance

1.1 metrology
1.2 dissolved silica
1.3 cleaning

quality assurance
metrology

when using laboratory glassware high precision measurements, such in testing laboratory, metrological grade glassware becomes important. metrological grade can determined confidence interval around nominal value of measurement marks , traceability of calibration nist standard. periodically may necessary check calibration of laboratory glassware.

dissolved silica

laboratory glassware composed of silca. silica considered insoluble in substances few exceptions such hydrofluoric acid. though insoluble minute quantity of silica dissolve may affect high precision, low threshold measurements of silica in water.

cleaning

cleaning laboratory glassware necessary , may done using multiple methods. glassware can soaked in detergent solution remove grease , loosen contaminations. these contaminations scrubbed brush or scouring pad remove particles cannot rinsed. sturdy glassware may able withstand sonicated alternative scrubbing. sensitive experiments glassware may soaked in solvents, such aqua regia or mild acids, dissolve trace quantities of specific contaminations known interfere experiment. when cleaning finished common practice triple rinse glassware before suspending upside down on drying racks.