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| Study on Uncertainty of Volume Measerment by Hydrostatic Weighing Method and Production of Calibration Medium |
| GUO Li-gong,LIU Zi-yong,WANG Jin-tao,Tong Lin,Bao Xu-song |
| National Institute of Metrology, Beijing 100013, China |
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Abstract To propose that highpurity water which producted by microfilter,recerse osmosis and electrodeionzation technology is used as calibration medium and as a substitute for tapwaterTo correcte the density of water for factors as the water isotopic abundance，teperature gradient and dissolved air，the isotopic abundance，teperature gradient and atmosphere environmental parameters (t,p,RH) are measuredThe water quality report shows that the water be producted is in accord with the GB/T 11446.1 EW-I standardThe standard measurement uncertainty of water density is reduced to 7×10-3kg/m3,and the measurement uncertainty of the volume primary standard Urel is less than 3×10-5（k=3）.
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2013, Vol. 34 
