Double Freezing-Point Method for Determination of Styrene Purity

1948 ◽  
Vol 20 (4) ◽  
pp. 321-325
Author(s):  
J. F. Masi ◽  
R. K. Cheney
Keyword(s):  
Freezing Point ◽  
Point Method

Determination of Isosmolar Blood Anticoagulant Solutions by the Freezing-Point Method

1958 ◽  
Vol 4 (2) ◽  
pp. 142-145 ◽  
Author(s):  
Harold M Kaplan ◽  
Edward F Stephens
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Freezing Point ◽  
Point Method

Abstract Freezing-point depressions of several anticoagulants were determined from which concentrations isosmolar with the blood of any species may be computed. The method is not applicable to solutes of high molecular weight.

The indirect determination of the “wilting coefficient” by the freezing-point method, and the influence of the salts upon the pF at that critical moisture content

1938 ◽  
Vol 28 (4) ◽  
pp. 654-662 ◽  
Author(s):  
J. V. Botelho da Costa
Keyword(s):  
Agricultural Soils ◽  
Freezing Point ◽  
Preliminary Investigation ◽  
Salt Content ◽  
Point Method ◽  
Indirect Determination ◽  
History Of ◽  
Moisture Equivalent ◽  
Critical Moisture

The results obtained in the preliminary investigation were entirely confirmed, the pF at the “wilting coefficient”, as measured by the modified freezing-point method, varied from 4·0 to 4·4 (round figures), with an average of 4·2.The variation observed bears no relation to the soil texture, neither can it be explained by uncertainties in the freezing-point determinations which have proved to be accurately reproducible. Freezing-point measurements after leaching, conductivity measurements and freezing-point determinations in saturated soil and at the moisture equivalent proved that part of the variation is due to the presence of soluble salts, the more saline soils having a higher pF at the “wilting coefficient”. When the salt content does not exceed about 500 p.p.m. the influence of the salts is hardly detectable, and the pF at the “wilting coefficient” lies between 4·0 and 4·3. Besides unavoidable errors in the wilting experiments several other factors may account for this variation. They are all the factors that have any role in the “history” of the soil. In view of these uncontrollable sources of error a variation of 0·3 pF units can be considered very small.It can therefore be confidently concluded that in ordinary agricultural soils with a salt content of less than about 500 p.p.m. permanent wilting occurs when a critical pF value (lying between 4·0 and 4·3) is reached.

Determination of Cell Sap Concentration by the Freezing Point Method

1916 ◽  
Vol 8 (1) ◽  
pp. 50-50
Author(s):  
George J. Bouyoucos ◽  
M. M. McCool
Keyword(s):  
Freezing Point ◽  
Point Method

Cryoscopy of Milk: Effect of Variations in the Method

1966 ◽  
Vol 49 (3) ◽  
pp. 511-515 ◽  
Author(s):  
R W Henningson
Keyword(s):  
Statistical Analysis ◽  
Sample Size ◽  
Freezing Point ◽  
Collaborative Study ◽  
Sample Temperature ◽  
Milk Samples ◽  
Two Samples ◽  
Temperature Rate

Abstract Bath level, sample temperature, rate of stirring, degree of supercooling, sample size, sample isolation, and refreezing of the sample were the variables in the thermistor cryoscopic method for the determination of the freezing point value of milk chosen for study. Freezing point values were determined for two samples of milk and two secondary salt standards utilizing eight combinations of the seven variables in two test patterns. The freezing point value of the salt standards ranged from –0.413 to –0.433°C and from –0.431 to –0.642°C. The freezing point values of the milk samples ranged from –0.502 to –0.544°C and from –0.518 to –0.550°C. Statistical analysis of the data showed that sample isolation was a poor procedure and that other variables produced changes in the freezing point value ranging from 0.001 to 0.011°C. It is recommended that specific directions be instituted for the thermistor cryoscopic method, 15.040–15.041, and that the method be subjected to a collaborative study.

In situ freezing point determination of cryolite baths utilising resistometer measurements

2014 ◽  
Vol 18 (12) ◽  
pp. 3339-3344 ◽  
Author(s):  
Graeme A. Snook ◽  
Katherine McGregor ◽  
Andrew J. Urban
Keyword(s):  
Freezing Point ◽  
Point Determination
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