soil sample homogenization

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MLBruce
MLBruce's picture
soil sample homogenization

I am looking for alternatives for homogenizing soil samples before sample preparation and analysis for environmental pollutants.

Air drying followed by grinding produces a very homogeneous sample, however there are significant losses of the low boiling and thermally unstable analytes. Example problem analytes include 1,2-dichlorobenzene, napthalene and hexachlorocyclopentadiene.

Any suggestions for homogenization processes and equipment?

jachmoody
jachmoody's picture
You might consider a liquid

You might consider a liquid nitrogen cooled homogenizer--will check to see if I bookmarked it --and get back to you if I find it. Just saw an on-line ad for such a device the other day. Was looking for grinding media etc.
jim

Andreas Heinemann
Andreas Heinemann's picture
MLBruce wrote:I am looking

MLBruce wrote:

I am looking for alternatives for homogenizing soil samples before sample preparation and analysis for environmental pollutants.

Air drying followed by grinding produces a very homogeneous sample, however there are significant losses of the low boiling and thermally unstable analytes. Example problem analytes include 1,2-dichlorobenzene, napthalene and hexachlorocyclopentadiene.

Any suggestions for homogenization processes and equipment?

Depending on the sample volume, I would recommend to use the CRYO-PRESS, where you homogenize under (and in) liquid nitrogen, but this is for sample volumes of some ml only.

martin wang
martin wang's picture
There are several fast

There are several fast homogenizers available, most samples can be done within a minutes. You can also place the homogenizer inside cold room if you like.
The throughput is something separate these equipment, NA-01 works with less than 24 samples, HTH can do one 96 well plate at a time, while MM400 can work with two plates in one load.
 

Dr. Analytical
Dr. Analytical's picture
Another simple option is

Another simple option is drying with an adsorbent (e.g., sodium sulfate), combined with any of the cryo approaches outlined above.  Even mechanical milling with dry ice should eliminate the loss of volatiles.  But as you know, reducing the moisture content is the key step.
 

Andreas Heinemann
Andreas Heinemann's picture
If sample volume is not to

If sample volume is not to big, try a "CRYOpress", made in Japan, very easy to use, absolutely reliable and best performace!