Correlation of Humus and Water Content on Saba Clay, Denton, Texas Page: 37
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37
oven for five hours to remove any moisture that might have
been gained during the handling of the sample prior to
bottling. 0.5000 gram samples of the oven-dry samples
were weighed in a weighing bottle and placed in one hundred
and twenty-five co. Erlenmeyer flasks. Ten cc. of chromic
acid solution were added and the flasks covered with small
funnels which act as condensers. The flasks were then
placed on a hot plate. The contents of the flask were slow-
ly raised to the boiling point, then moderately boiled for
exactly five minutes.
After the flasks had cooled, the contents were trans-
ferred to six hundred co. beakers with two hundred and
fifty cc. of distilled water. The funnels were carefully
rinsed into the beakers to avoid losing any material ad-
hering to them.
The oantent of the beaker was titrated with ferrous
ammonium sulphate. With ten drops of diphenyalmine, the
color change is from a violet-blue to a gray-green, which
changes, on standing, to a deep green.
By deducting the burette reading from that of the con-
trol (twenty oc. of chromic acid solution) and multiplying
by the conversion factor 1.054, the humus content of the
soil used for the determination is obtained.
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Wilson, Clyde Byron. Correlation of Humus and Water Content on Saba Clay, Denton, Texas, thesis, August 1938; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc32922/m1/44/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .