A Chemical Analysis of the Important Soils of Dimmit County, Texas Page: 19
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aaed tr shaking and 150 cc. diatilled over. The cos tof aid m
titrated a d the per cent of nitrogen calculated. In this way duplicates
of each sample were ra.
04AU19 N P a'En a niAtrgei.--*A saple of soil of twenty times
the factor weight wa placed in the Kjeldabl digestion flLsk. Then 0.7 g.
of EgO was added and 25 se. of Hg04. The flask was heated below the
boiling point of the acid, in an inclf ed position, until frothing ceased.
It was boiled briskly until the solution exhibited a straw color.
After cooling, the mixture as diluted with 200 cc. of wtcr, a few
pieces of granlated sine wire added to prevent bumping, 25 cc. of NaS
(40 g. per liter) to precipitate the mercury, and NaPI solution added
as above. The percentage of nitrogen as ororganic nd raroncal was re
ported. Dwral fine sandy loam and Ualde silty clay lo& were treated
in the sae way.
Nitrte 4toIge--A sample of 50 grams of zoil wa pacd in a
600 cc* beaker and stirred vigorously for 5 minute. Two grams of pow-
dered CaCOg were aOded as a flocculating r gpnt, the tmiture stirred
thorougly, and allowed to stand 20 amimtes before filterg through
Bolston No. 44 filter paper. When the filtrate s treated with 1 M
AgWD solution it gave no visible precipitAe so the phenaldisulphonic
acid mthod was chosen.
A vlur of 10 cc. of the fil rate was evaporated to dryiess over
a steam bath. After cooling, the residue as treated with 2 cC. of the
phewldtaulphonic acid solution (1 co, 0.01 rag. of nitrogen). The
stalard was prepared fr dissolving 0.400 grams of NMDl in I liter of
nitrate-ree water and evaporating 50 cc. of this solution to dryness.
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Meek, William. A Chemical Analysis of the Important Soils of Dimmit County, Texas, thesis, August 1938; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc29922/m1/25/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .