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Here is what we normally do to prepare acid for carbonate analysis: leave the HDPE bottle of crystalline acid in the oven at 70'C overnight, transfer the liquid acid into the glass bottle, then add about 70g high purity P2O5 and shake the bottle by hand, and leave the bottle in the oven at 70'C overnight.  You should be able to get the acid with ca. 1.93 SG, which works for carbonate analysis!
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On Fri, 10/10/14, Mihai Lefticariu <[log in to unmask]> wrote:

 Subject: Re: [ISOGEOCHEM] Acido Fosforico (103%) Multiflow IRMS
 To: [log in to unmask]
 Received: Friday, October 10, 2014, 1:50 AM
 
 Carlos,
 
 You can prepare 103%
 phosphoric acid starting with Merck crystalline
 orthophosphoric acid following the procedure described by
 Burman et. al (Rapid Commun. Mass Spectrom. 2005; 19:
 3086–3088). Just make sure that it comes in an HDPE bottle
 (high-density polyethylene) otherwise the bottle may start
 melting and contaminate the acid. Use a lower heating
 cabinet/oven temperature if not sure. Cheers. Mihai
 Lefticariu (Southern Illinois University Carbondale)
 ________________________________________
 From:
 Stable Isotope Geochemistry <[log in to unmask]>
 on behalf of carlos <[log in to unmask]>
 Sent: Thursday, October 9, 2014 11:12 AM
 To: [log in to unmask]
 Subject: [ISOGEOCHEM] Acido Fosforico (103%)
 Multiflow IRMS
 
 Nuestro
 laboratorio esta instalando (primero en Cuba) un IRMS
 acoplado a
 un Analizador Elemental y
 Multiflow. Para el analisis en carbonatos es
 necesario utilizar Acido fosforico al 103%,
 segun nos indica el
 fabricante. Por favor
 nos pudieran enviar algun procedimiento para
 obtener esta concentracion.
 
 Gracias y saludos
 
 Carlos Alonso-Hernandez