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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   11B/10B MEASUREMENTS BY NEGATIVE ION MASS–SPECTROMETRY.

Authors:  MACIEJ CZARNACKI, STANISLAV HALAS. 		 
       
         
  Abstract:  A number of papers show procedures for simple and precise measurements of boron isotope composition in natural samples (Aggarwal & Palmer, 1995, and references therein). In our measurements of boron isotope composition, we used in the single ion source PtRh and Re filaments and BaCl2 as an activator. By monitoring spectrum at mass 26 (CN- ions) using PtRh filament, we observed a significant interference at mass 42 (BO2 - with CNO- ions). Platinum is a good catalyst for organic ion production. This effect can be reduced by burning off all the organics during loading the sample by heating it in air to a dull red color (700ºC). The use of rhenium filament leads to a lower interference effect, but after burning off the organics, we have to use a temperature considerably higher to get sufficient ion current, because the rhenium material suffers some oxidization  
         
     
         
         
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