Steps we DO NOT take to ensure manure sample integrity:

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Steps we DO NOT take to ensure manure sample
integrity
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We do not provide sample bottles containing
preserving agents, such as Sulfuric Acid.
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This could cause severe injury to the person
collecting the sample, if collection is not
performed extremely carefully.
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There are possible regulatory concerns or legal
repercussions in the event of an accident.
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Not to mention the very likely possibility of the
sample bottle exploding duringshipment, because
of the gasthat reactions would produce.
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We do not addpreserving agentswhen we
receivesamples, because of the same possibility
of explosion in storage.
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Steps we DO take to ensure manure sample
integrity
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We provide free, verifiably clean liquid manure
bottles and semi-solid/solid manure bags.
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We offer free consulting on how manure should be
sampled. We suggest to ourcustomers that
samplesbe shipped via overnightdelivery, and
withcold packs, if possible.
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As soon as we receive manure samples, they are
checked into our database, and stored in a
refrigerator at 3 to 5 degrees C until analyses
begin.
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Moisture Analysis
Moisture Analyses are performed at 70 degrees C
to help prevent excessive loss of ammoniac
nitrogen.
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We perform the moisture analysis for semi-solid
and solid samples as a two-step process to help
obtain a more usable and representative sample
for other analyses. A large amount of sample (gt
100g) is dried to a moisture of less thanbut
near to 10. Then the entire driedsample is
ground to passthrough a 2mm screen.
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Then this ground sample is used for remaining
tests, except for ammonia analysis. The ground
sample is dried further to a constant weight. The
total loss on drying (moisture) is calculated as
follows (A(B/C))((1-(B/C))100) A Moisture
from dried sampleB Weight of sample after
first dryingC Initial sample weight before
first drying
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The As Received Basis results of the other
analyses performed on the dried sample are then
calculated as follows A(B/C) A Result from
dried sampleB Weight of sample after first
dryingC Initial sample weight before first
drying
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Ammonia Analysis
Ammonia analysis for both liquid manure samples
and semi-solid and solid manure samples are
performed on the sample as it was received (As
Received Basis).
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We take extra precautions during the ammoniac
nitrogen analysis by covering samples that have
been dissolved in water with Para film, and we
monitor the time samples are mixed to prevent
excessive stirring and loss of ammonia. If deemed
necessary, the pH of the sample may be dropped
below 2.
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Total Nitrogen Analysis
Total Nitrogen is determined by performing a
combustion analysis. We take extra precautions to
ensure that we are determining all forms of
nitrogen (organic nitrogen and ammoniac nitrogen).
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For liquid manure samples, immediately after
samples are weighed, a couple of drops of
concentrated Sulfuric Acid are added to the
sample. This prevents the loss of
excessiveamounts of ammoniac nitrogenwhile the
sample is waiting to beanalyzed. We have
observedstatisticallyhigher resultsfrom
samplestreated withSulfuric Acid.
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For semi-solid and solid samples we clinicalize
the analysis of Total Nitrogen. First we perform
the ammoniac nitrogen analysis on both the As
Received sample and the dried ground sample.
Wet sample
Dry sample
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Then we determine the nitrogen content of the
dried ground manure sample using combustion
analysis.
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We then calculate the total nitrogen of the
sample on an As Received Basis as
follows ((A-B)(C/D))E A Nitrogen from
dried sampleB Ammoniac Nitrogen from dried
sampleC Weight of sample after first dryingD
Initial sample weight before first dryingE
Ammoniac Nitrogen from wet sample
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P2O5 (P), K2O (K), and OtherTrace Metal Analyses
P2O5, K2O and other trace metal analyses do not
require the same precautions as tests mentioned
earlier. They are simply weighedand digested
foranalysis.
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We do take special care to ensure that the entire
sample is fully digested. The easiest way of
ensuring complete digestion is by looking for the
absence of Active Site Boiling.
CompletelyDigested
Active SiteBoiling (not fully digested)
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This completes the discussion of our steps taken
to ensure the integrity of manure samples. Thank
you for your attention.