The micro-determination of potassium as cobaltinitrite in biological and agricultural materials. Part 1. Review

The Analyst ◽  
1948 ◽  
Vol 73 (863) ◽  
pp. 86 ◽  
Author(s):  
J. Tinsley
Keyword(s):  
Agricultural Materials

Comparison of the Automatic Dumas (Coleman Model 29A Nitrogen Analyzer II) and Kjeldahl Methods for the Determination of Total Nitrogen in Agricultural Materials

1968 ◽  
Vol 51 (1) ◽  
pp. 216-219 ◽  
Author(s):  
G F Morris ◽  
R B Carson ◽  
D A Shearer ◽  
W T Jopkiewicz
Keyword(s):  
Experimental Data ◽  
Standard Deviation ◽  
Total Nitrogen ◽  
Statistical Evaluation ◽  
Kjeldahl Method ◽  
Agricultural Materials ◽  
Combustion Technique

Abstract A wide variety of agricultural materials were analyzed for total nitrogen by the Kjeldahl and automatic Dumas methods. The recoveries of nitrogen compared favorably by both methods when a catalystassisted combustion technique was used in the automatic Dumas method. Statistical evaluation of the experimental data, as measured by standard deviation, showed that the Kjeldahl method was generally more precise than the automatic Dumas method

Determination of Aflatoxins in Agricultural Products: Use of Aqueous Acetone for Extraction

1966 ◽  
Vol 49 (3) ◽  
pp. 554-562 ◽  
Author(s):  
W A Pons ◽  
A F Cucullu ◽  
L S Lee ◽  
J A Robertson ◽  
A O Franz ◽  
...  
Keyword(s):  
Silica Gel ◽  
Crude Extract ◽  
Analytical Procedure ◽  
Chloroform Extract ◽  
Aqueous Acetone ◽  
Agricultural Products ◽  
Agricultural Materials

Abstract An analytical procedure originally developed for the determination of aflatoxins in cottonseed products has been modified for application to many agricultural materials. Aflatoxins are rapidly extracted free of lipid contamination with 70% acetone. Many interfering pigments are removed from the crude extract by precipitation as insoluble lead derivatives, transfer of aflatoxins into chloroform, and further purification of the chloroform extract with silica gel. The procedure was compared with four recently proposed methods for the analysis of peanut products. This technique is capable of detecting as little as 0.3 ppb of aflatoxin Bi in peanuts and peanut butters. Adequate recovery of added aflatoxins was obtained when this method was applied to numerous different agricultural products.

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