osmometry


Also found in: Dictionary, Encyclopedia, Wikipedia.
Related to osmometry: osmotic pressure, refractometry

os·mom·e·try

(oz-mom'ĕ-trē),
Measurement of osmolality by use of an osmometer.

os·mom·e·try

(oz-mom'ĕ-trē)
Technique used to determine the number of solute particles in solution by measuring changes in a colligative property.
References in periodicals archive ?
mEq/L 17.1 [+ or -] 0.3 36 <.001 Chloride, mEq/L 112 [+ or -] 0.5 38 <.001 Glucose, mg/dL 260 [+ or -] 3.8 38 <.001 Potassium, mEq/L 3.6 [+ or -] 0.1 39 <.001 Sodium, mEq/L 144 [+ or -] 0.4 37 <.001 [OSM.sub.C], mOsm/kg 309 [+ or -] 0.8 36 <.001 [OSM.sub.F], mOsm/kg 280 [+ or -] 1.0 36 <.001 PC[O.sub.2], mmHg 32.0 [+ or -] 0.6 37 <.001 PC[O.sub.2TC], mmHg 40.7 [+ or -] 0.7 33 <.001 pH, 37[degrees]C 7.4 [+ or -] 0.0 38 <.001 WBC, /nL 4051 [+ or -] 446 35 .008 Abbreviations: Cal indicates calculated; [OSM.sub.C] calculated plasma osmolality; [OSM.sub.F], plasma osmolality determined by freezing point depression osmometry; PC[O.sub.2].
Many techniques including, vapour pressure osmometry, gel permeation chromatography, viscometry, and mass spectrometry have been utilized to measure molecular weights with widely varying results.
(Select all that apply.) N Percent Conductivity using Wescor Sweat Chek 349 42.4 Conductivity using Advanced Instruments 33 4.0 Chloride using a titration instrument 268 32.6 Chloride using Orion skin measuring electrode 68 8.3 Chloride using the CF indicator patch 28 3.4 Chloride using a multitest automated analyzer 25 3.0 Sodium using a flame photometer 23 2.8 Sodium using a multitest automated analyzer 12 1.5 Vapor pressure osmometry 11 1.3 Freezing point depression osmometry 6 0.7 12.
But primary methods based on light scattering and vapor pressure osmometry give weight average and number average molecular weights respectively.
The lack of commercial standards arises from difficulties obtaining narrow molecular mass fractions of polyethylene and in measuring absolute molecular masses by light scattering or osmometry at temperatures as high as 150 [degrees]C.
Melt flow rate, melt flow index, membrane osmometry, end-group analysis and dilute solution viscosity are a few examples.
Osmolality was measured by vapor pressure osmometry. Specific gravity and osmolality measurements were highly correlated (r = 0.96).
KNAUER, HPLC, SMB, Osmometry, Berlin, Germany Supelco, Bellefonte, PA
The average aggregation number of an isolated asphaltene fraction can be determined with vapour pressure osmometry (VPO).