Does anyone know how to remove bonnet in the RF Coil of a PE Optima 2100 ICP? Remove the coil first or have to remove the radial window first?
Any information is very helpful.
Red River ELCC
6510 S Western Ave
Oklahoma City, OK. 73139
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On Sep 15, 2011, at 9:48 AM, "Drew, Glenn" <[log in to unmask]> wrote:
> Speaking with 35 years of experience using this HF / Boric neutralization daily.
> 90 deg C is all that is required to quantatively extract the Si .
> High temp "is not" required to make neutralization, it will take place in cold solution, when boric is mixed into the solution. Until the boric is added the HF maintains all its nasty properties.
> Note, this is not the recommended way to test the remaining HF presence, but having spilled the boric neutralized solutions on myself several times, there is little if any irritation to the skin. As all are aware, any free HF will result in a very painful "burn". Years ago, Some chemists experiences burns from a single drop on the skin and then heeded the requirement to wear gloves when dispensing HF. Now they must wear gloves to use HF or face discipline.
> We have never had an incident of injury with the boric neutralized HF...
> Glenn Drew, Chief Chemist
> ASARCO LLC
> Ray Complex, Hayden Laboratory
> POBox 8 64 ASARCO Dr.
> Hayden, Az 85135
> 520-356-4257 phone
> 520-356-4289 fax
> [log in to unmask]
> -----Original Message-----
> From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Ph. De Raeve
> Sent: Thursday, September 15, 2011 12:33 AM
> To: [log in to unmask]
> Subject: HF neutralization with H3BO3
> Dear all,
> Very often, Silicon containing samples are digested in a micro-wave oven with acid mixtures containing HF.
> In order to allow injection in a ICP with quartz nebulizer and torch, remaining HF may be eliminated by addition of Boric acid.
> In most papers, a second micro-wave cycle at about 200ˇăC is required to complete this HF "neutralization".
> Is high temperature necessary for this neutralization ?
> Some propose a simple mixing with an excess of a saturated Boric acid solution...
> Is there a way to evaluate the remaining HF after H3BO3 treatment ?
> Philippe De Raeve
> Quality Assistance SA
> Technoparc de thudinie, 1
> 6536 Donstiennes
> [log in to unmask]