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COMMENDIUM OF INTERNATIONAL METHODS OF ANALYSIS - OIV Density and Specific Gravity – Type I methods Calculate the apparent density, p t°C: OIV-MA-AS2-01A: R2009 t C ( '' ) 0, 0012 V 20C Correct this density to 20°C by using Table II, III or IV (if the float is Pyrex glass) or Table V, VI or VII (if it is ordinary glass). 7
COMMENDIUM OF INTERNATIONAL METHODS OF ANALYSIS - OIV Density and Specific Gravity – Type I methods ANNEX I (worked example) I. Pycnometry with twin-pan balance A/ Standardization of the pycnometer 1. Weigh a clean and dry pycnometer: Tare = pycnometer + p p= 104.9454 g 2. Weigh pycnometer filled with water at temperature t°C: Tare = pycnometer + water + p' p' = 1.2396 g at t = 20.5°C 3. Calculate mass of air within the pycnometer: m = 0.0012 (p - p') m = 0.0012 (104.9454 - 1.2396) m = 0.1244 4. Values to record: Tare of empty pycnometer: p + m p + m = 104.9454 + 0.1244 p + m = 105.0698 g Volume at 20°C = (p + m - p') x Ft°C F20.50°C = 1.001900 V20°C = (105.0698 - 1.2396) x 1.001900 V20°C = 104.0275 mL Mass of water at 20°C = V20°C x 0.998203 M20°C = 103.8405 g B/. Determination of density at 20°C and 20°C/20°C density for dry wine: p" = 1.2622 at 17.80°C 105. 0698 1. 2622 17. 80 C 104. 0275 1780 . C 0. 99788 p20°C can be calculated from t°C using Table II and the equation: c 20C tC 1000 At t = 17.80°C and for an alcoholic strength of 11% vol., c = 0.54: 0.54 20 C 0. 99788 1000 0. 99734 g/ mL 20 C d C 20 20 C OIV-MA-AS2-01A: R2009 0. 998203 99734 . 0 0. 99913 8
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