Rapid Gravimetric Determination of Mercury in Organic Compounds

1956 ◽  
Vol 28 (3) ◽  
pp. 406-407 ◽  
Author(s):  
H. F. Walton ◽  
H. A. Smith
Keyword(s):  
Organic Compounds ◽  
Gravimetric Determination

Collaborative Study of the Microanalytical Determination of Phosphorus in Organic Compounds

1973 ◽  
Vol 56 (4) ◽  
pp. 897-900
Author(s):  
Roger A Lalancette ◽  
Al Steyermark ◽  
Ruth Ann Lee ◽  
Donna M Lukaszewski
Keyword(s):  
Phosphoric Acid ◽  
Organic Compounds ◽  
Statistical Evaluation ◽  
Collaborative Study ◽  
Wet Digestion ◽  
Gravimetric Determination ◽  
Two Samples ◽  
Significant Difference

Abstract Sixteen collaborators participated in the study of the determination of phosphorus in organic compounds. Two samples were analyzed by the methods currently in use in the collaborators’ respective laboratories. Samples were combusted by oxygen flask, peroxide fusion, and wet digestion with acid(s). The resulting phosphoric acid was determined either gravimetrically, colorimetrically by the heteropoly blue method, or colorimetrically by the molybdenum yellow method. The various combustion methods were not compared, since there were not enough data to warrant this. The determinative steps were compared, but the data showed no significant difference in either precision or accuracy for any variation. A statistical evaluation of the data showed that the overall mean for the colorimetric heteropoly blue determination of triphenylphosphine (11.81% P) for 4 collaborators is 11.72%; for the colorimetric molybdenum yellow determination for 5 collaborators, 11.70%; and for the gravimetric determination for 3 collaborators, 11.93%. For phenylmethylphosphinic acid (19.97% P), the corresponding values are 19.64, 19.80, and 19.95%.

ORGANIC REAGENTS FOR PLATINUM METALS: II. THE GRAVIMETRIC DETERMINATION OF RHODIUM

1949 ◽  
Vol 27b (2) ◽  
pp. 72-75 ◽  
Author(s):  
R. L. Haines ◽  
D. E. Ryan
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Organic Compounds ◽  
Atomic Weight ◽  
Similar Type ◽  
Platinum Metals ◽  
Organic Reagents ◽  
Molecular Weights ◽  
Gravimetric Determination

Rhodium may be precipitated quantitatively with 2-mercaptobenzoxazole or 2-mercaptobenzothiazole. An acetic acid precipitating medium is preferred; slight variations in the concentration of acid, when nitric acid was used, caused low results. Several similar type organic compounds showed no advantages over the above two. The complex appears to have three molecular weights of the reagent combined with one atomic weight of rhodium.

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