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ISOGEOCHEM  January 2016

ISOGEOCHEM January 2016

Subject:

Re: Ag plug removal - making crucibles

From:

Jim Palandri <[log in to unmask]>

Reply-To:

Stable Isotope Geochemistry <[log in to unmask]>

Date:

Fri, 29 Jan 2016 13:29:14 -0800

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (190 lines)

Thanks Gerry,

If we had known how easy they are to make at home, we would have started 
years ago.

More than one person has mentioned a tiny funnel that goes at the top, 
and a photo of that would be fabulous.

Thank you again!

-Jim
_______________________________________________________
Some notes we took at the time:

http://pages.uoregon.edu/palandri/MS/HomemadeTCEA_crucibles.txt

Photos from our first go-round:

http://pages.uoregon.edu/palandri/MS/HomemadeTCEA_crucibles.jpg
http://pages.uoregon.edu/palandri/MS/HomemadeTCEA_crucibles_shim-and-vise.JPG
http://pages.uoregon.edu/palandri/MS/HomemadeTCEA_crucibles_shim-in-vise.JPG



On 10/21/2015 12:01 PM, gerard olack wrote:
> HI Jim--
>
> Here we're using some from National Carbon--left over from the '60's I
> believe....
>
> But you can get some from general suppliers, e.g. McMaster, or from
> glass apparatus suppliers, which have wider selections of narrower
> tubes, e.g. Wale:
> http://www.mcmaster.com/#graphite/=zgsgw7
> http://www.waleapparatus.com/catalog.asp?prodid=548212&showprevnext=1
>
> Just find the size that will fit your glassy C tube.  These are
> "premium" and "fine grain" ... and softer then the supplied crucibles. I
> haven't found a square graphite electrode that's the right size...
>
> I'll tend to leave a little more cushion at the bottom when I drill them
> out, and shave the sides just below the top a little.  Graphite is
> slippery.  When drilling, don't really push it--for the rod will just
> get pushed back.  A lathe works nicely.  If you try a drill press, get a
> 1/2" thick piece of wood, drill a hole in it the same diameter as the
> carbon rod, saw the wood piece in half--going thru the hole.  Put the
> piece of graphite rod you want to drill into the "hole" and clamp the
> two pieces of wood together/down.
>
> And yes, do a pilot hole and work your way up--and you'll lose a few and
> you see the bit coming out the side.  Note--they don't have to be
> perfect...
>
> take care,
>
> gerry
>
> On 10/21/2015 11:41 AM, Jim Palandri wrote:
>> Good day!
>>
>> I haven't made any crucibles, but at $38+ each the last time
>> purchased, am willing to have a go at it. We have a precision lathe in
>> the experimental petrology lab already equipped with mounds of messy
>> graphite.
>>
>> Please can you supply a supplier and part number for square graphite
>> bar stock?
>>
>> Thank you!
>> -Jim
>>
>> On 10/21/2015 8:55 AM, gerard olack wrote:
>>> HI All--
>>>
>>> I presume you're all making your own crucibles.  Messy, but once a drill
>>> (or undergrad) is set up, easy enough to push thru a few. And safer than
>>> trying to melt out the silver with a torch ;)
>>>
>>> My last attempt was to put slots on the side of the crucible to try to
>>> grab the pellet once it was knocked down to the lip of the crucible.
>>> Not sure if it really made removal easier... And sometimes we'll drill
>>> out a slightly wider opening for the pellet if it doesn't want to
>>> come out.
>>>
>>> If you use a square block, or buy them, take a graphite rod a make a
>>> little funnel to sit on top of the crucible.  Helps if the crucible is a
>>> little or high or low in the hot zone--prevents sample from falling down
>>> the side of the crucible to the glassy C support chips or sitting on top
>>> of the crucible and not falling all the way in.
>>>
>>> take care,
>>>
>>> gerry
>>>
>>>
>>>
>>> On 10/21/2015 9:10 AM, Grimm, Brittany L. (LD) (CON) wrote:
>>>>
>>>> Hi Misuk,
>>>>
>>>> I also tap the crucible on the counter and end up breaking it about
>>>> half the time.  Dyke’s suggestion seems like a good one.
>>>>
>>>> Best,
>>>>
>>>> Brittany
>>>>
>>>> Brittany L. Grimm
>>>>
>>>> ORISE Visiting Scientist
>>>>
>>>> FBI Laboratory Division
>>>>
>>>> Counterterrorism and Forensic Science Research Unit
>>>>
>>>> 2501 Investigation Parkway
>>>>
>>>> Quantico, VA 22315
>>>>
>>>> 703-632-7828
>>>>
>>>> *From:*Stable Isotope Geochemistry [mailto:[log in to unmask]]
>>>> *On Behalf Of *Dyke Andreasen
>>>> *Sent:* Tuesday, October 20, 2015 5:37 PM
>>>> *To:* [log in to unmask]
>>>> *Subject:* Re: [ISOGEOCHEM] Ag plug removal
>>>>
>>>> Hi Misuk,
>>>>
>>>> I generally have had good success by pinching the open end of the
>>>> crucible between my thumb and index finger and firmly whacking my
>>>> fingers against the counter top such that the crucible does not touch
>>>> the counter but comes very close. It takes a few taps but eventually
>>>> the silver works its way out.
>>>>
>>>> Cheers,
>>>>
>>>> Dyke
>>>>
>>>> University of California, Santa Cruz
>>>>
>>>> On Tue, Oct 20, 2015 at 1:24 PM, Misuk Yun <[log in to unmask]
>>>> <mailto:[log in to unmask]>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> Does anyone have an easy way to remove silver plug from C crucible
>>>> (for pyrolysis analysis)?
>>>> I tapped it on the counter top. Sometimes, yes it works, but sometimes
>>>> not.
>>>> It breaks when I tap it on the counter top as well.
>>>>
>>>> Thanks.
>>>>
>>>> Misuk
>>>>
>>>>
>>>> Misuk Yun, M.Sc.
>>>> Manager, Stable Isotope Lab and Geochemistry Lab
>>>> WHMIS coordinator
>>>>
>>>> Department of Geological Sciences
>>>> Wallace Bldg.
>>>> 125 Dysart Road
>>>> University of Manitoba
>>>> Winnipeg, MB R3T 2N2 CANADA
>>>> Tel. 204-474-8870 <tel:204-474-8870> (Lab, Office)
>>>> Fax. 204-474-7623 <tel:204-474-7623> (Department)
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Dyke Andreasen
>>>> University of California, Santa Cruz
>>>> Earth and Planetary Sciences
>>>> 1156 High Street
>>>> Santa Cruz, CA  95064
>>>> (831)459-5857
>>>>
>>>
>>

-- 
Jim Palandri
Research Associate
Department of Geological Sciences
1272 University of Oregon
Eugene, OR 97403-1272

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