Aluminum and Iron in Plants

1964 ◽  
Vol 47 (4) ◽  
pp. 785-787
Author(s):  
Elizabeth I Lixden
Keyword(s):  
Colorimetric Method ◽  
Chelating Agent ◽  
Review Of Literature ◽  
Comparison Of Results ◽  
Methods Of Analysis ◽  
Official Methods Of Analysis

Abstract A review of literature discloses nun erous methods applicable to determination of Al and Fe in plants. A comparison of results for Fe by a colorimetric method using 2,2’-bipyridine as chelating agent with those by the colorimetric o-phenanthroline and the TiCl3 titrimetric methods in Official Methods of Analysis showed that the 2,2’-bipyridine was simpler, less time-consuming, and equally as accurate as the o-phenanthroline procedure, and free of the Cu interference encountered in the TiCl3 method. Further study is recommended for accurate and efficient methods for Al and Fe.

Atomic Absorption Determination of Lead in Apples

1974 ◽  
Vol 57 (4) ◽  
pp. 970-972
Author(s):  
John R Markus
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Spectrophotometry ◽  
Atomic Absorption Determination ◽  
Methods Of Analysis ◽  
Coefficients Of Variation ◽  
Absorption Determination ◽  
Official Methods Of Analysis

Abstract Two studies have been conducted on the analysis of apples for lead by atomic absorption spectrophotometry using the official first action method, 25.B01–25.B05. Sixteen laboratories participated in each study. Recoveries ranged from 92.6 to 110% (101.6% average) in the first study. A second study, in which procedural modifications were made, showed recoveries ranging from 91.2 to 109.7%, with an average of 100.0%. Coefficients of variation for the first and second studies were 5.19 and 4.94%, respectively. On the basis of the second study, procedural modifications have been incorporated into the 12th Edition of Official Methods of Analysis.

Comparison of GLC and Colorimetric Methods for Determination of Methanol in Alcoholic Beverages

1971 ◽  
Vol 54 (4) ◽  
pp. 785-786
Author(s):  
R H Dyer
Keyword(s):  
Colorimetric Method ◽  
Alcoholic Beverages ◽  
Methanol Content ◽  
Comparison Of Results ◽  
Colorimetric Methods

Abstract A comparison of results by a proposed GLC method and the present AOAC colorimetric method (9.071-9.074) for methanol in alcoholic beverages is presented. The GLC method utilizes a Carbowax 1500 on Chromosorb W column (similar to 9.063) for determination of methanol content at concentrations as low as 0.003% methanol. In the lower methanol concentrations the GLC results were higher, possibly due to a loss of methanol during the distillation required for the colorimetric method. A total of 20 samples of various alcoholic beverages were analyzed for methanol and the concentration of methanol ranged from 0.004 to 0.37%.

Liaison Report on Malt Beverages and Brewing Materials

1969 ◽  
Vol 52 (6) ◽  
pp. 1161-1165
Author(s):  
Irwin Stone
Keyword(s):  
Analytical Methods ◽  
Alternative Procedure ◽  
Brewing Industry ◽  
Comprehensive Program ◽  
Methods Of Analysis ◽  
Official Methods Of Analysis

Abstract Two new A SBC methods for beer analysis are presented to the AOAC for adoption: “Alcohol by Kefractometer” and “Beer Bitterness.” The first is a rapid alternative procedure to the present distillation technique. The latter replaces, in part, the isohumulones methods now used. The new edition of Official Methods of Analysis will also contain the “Total Haze After Chilling” method which partly replaces turbidity 10.010–10.015. The ASBC now has 12 technical subcommittees working on a comprehensive program for the development and testing of new analytical methods of interest to the brewing industry. Two additional subcommittees will probably be authorized to investigate the determination of traces of heptyl-p-hydroxybenzoate and tannins in beer, both of which are of interest to the AOAC.

Determination of Methyl Salicylate in Root Beer

1974 ◽  
Vol 57 (4) ◽  
pp. 1002-1004
Author(s):  
John R Markus
Keyword(s):  
Liquid Chromatography ◽  
Standard Deviation ◽  
Coefficient Of Variation ◽  
Methyl Salicylate ◽  
Gas Liquid Chromatography ◽  
Average Standard Deviation ◽  
Methods Of Analysis ◽  
Aoac Method ◽  
Official Methods Of Analysis

Abstract Root beer samples were analyzed for methyl salicylate by 17 laboratories, using the official final action AOAC method, 12.046-12.051. In this method, after the sample is distilled, methyl salicylate is extracted from the distillate with chloroform, and the compound is determined by gas-liquid chromatography. Recoveries of added methyl salicylate, 0.395 mg/ml, ranged from 0.349 to 0.428 mg/ml, with an average of 0.392 mg/ml. The average standard deviation and coefficient of variation were ±0.022 and 5.69%, respectively. On the basis of this study, procedural changes were recommended for method 12.046-12.051. They have been incorporated into the 12th Edition of Official Methods of Analysis.

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