Abstract
The effect of NO 3 − on the isotopic measurements of boron based on the Cs 2BO 2 + ion with graphite loading was investigated. The measured 309/308 ratio was considerably reduced by the presence of NO 3 − ion, especially in the presence of mannitol, due to the formation of the Cs 2CNO + ion producing ion peaks at masses of 308 and 309. The procedure of ion exchange using Amberlite IAR 743 resin, a boron-specific resin, and OH-Dowex 1 resin for extracting boron from sample solution was developed. The NO 3 − ion could be removed from sample solution during sample preparation by using this procedure.
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