Extension of dissemination of mass unit below 1 mg in Romania
National Institute of Metrology, Mass Laboratory, Şos. Vitan Bârzeşti nr. 11, sect. 4, 042122 Bucureşti, România
The determination of mass influences a vast range of activities and is the dominant factor in the conduct of trade. Many chemical reference methods rely on gravimetric determinations. Health, safety and business costs may be vitally dependent on the accurate determination of mass which it’s an important source of errors in any analysis. In addition, a wide range of derived SI units (Flow, Volume, Force, Pressure, Humidity, Density) is based on mass determination for traceability . An improvement in the realization and dissemination of the mass scale lead to an improvement of measurement uncertainty in these areas. Some of the needs for reduced uncertainties at small mass (milligram and below) exist in pharmaceutical, health, defence and biotechnology industries. Similarly, in nanotechnology, micro-mass standards can provide traceability for a range of measurements of mass, force and density. In the last period, the dissemination of mass unit below 1 mg has seen a continuous development, the main applications of the micro-mass being in the small force measurements and also for determination of sensitivity error of mass comparators with high accuracy. Considering all these aspects, the mass laboratory of Romanian National Institute of Metrology (INM) considered necessary to extend the dissemination of mass unit below 1 mg using micro-mass standards, with nominal values between (100...500) µg.
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