Showing papers in "Journal of AOAC International in 1973"
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TL;DR: In this paper, a modified Conway microdiffusion method was proposed for consecutive determinations of NH and NO-N in a given normalized fraction of soil extract, which is suitable for routine analyses of soil extracts, the equipment is expensive and no interferences are apparent.
Abstract: The proposed modified Conway microdiffusion
method provides for consecutive determinations
of NH?- and NO?-N in a given
aliquot of soil extract. Analyses of primary
nitrate standards showed essentially complete
recovery in the range of 1 to 20 ppm NO?-N
(4 to 80 µg N/aliquot). Results for (NH? +
NO?)-N and NO?-N in soil extracts are comparable
to those obtained, respectively, by
macrodistillation with Devarda's alloy and by
the phenoldisulfonic acid colorimetric method.
The method is rapid and suitable for routine
analyses of soil extracts, the equipment is
inexpensive, and no interferences are apparent.
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TL;DR: A neutron activation analysis procedure is described for testing cotton swabs for barium and antimony, which are commonly found in firearm residues.
Abstract: Cotton swabs moistened with 5% HNO/sub 3/ are frequently used by police investigators to process a suspect's hands for the presence of gunshop residue, A neutron activation analysis procedure is described for testing these swabs for barium and antimony, which are commonly found in firearm residues The limitations of the method are also discussed (auth)
TL;DR: In this paper, a method involving rapid blender extraction of the sample with aqueous acetonitrile and subsequent adsorption onto an alumina and silica gel column was applied to cotton seed, soybean and other seeds, various grains and nuts.
Abstract: The method, involving rapid blender extraction of the sample with aqueous acetonitrile and subsequent adsorption onto an alumina and silica gel column, was applied to cotton seed, soybean and other seeds, various grains and nuts. As little as 10 mu g aflatoxin/kg was detected and approx. contamination levels could be placed into 5 categories by the test