An improved procedure for extraction and purification of boron from naturalsamples is presented. The separation and purification of boron was carried out using aboron-specific resin, Amberlite IRA743, and a mixed ion ...An improved procedure for extraction and purification of boron from naturalsamples is presented. The separation and purification of boron was carried out using aboron-specific resin, Amberlite IRA743, and a mixed ion exchange resin, Dowex 50W * 8 and IonExchanger II resin. Using the mixed ion exchange resin which adsorbs all cations and anions exceptboron, the HCl and other cations and anions left in eluant from the Amberlite IRA 743 were removedeffectively. In this case, boron loss can be avoided because the boron-bearing solution does nothave to be evaporated to reach dryness to dislodge HCl. The boron recovery ranged from 97.6% to 102%in this study. The isotopic fractionation of boron can be negligible within the precision of theisotopic measurement. The results show that boron separation for the isotopic measurement by usingboth Amberlite IRA 743 resin and the mixed resin is more effective than that using Amberlite IRA 743resin alone. The boron in samples of brine, seawater, rock, coral and foraminifer were separated bythis procedure. Boron isotopic compositions of these samples were measured by thermal ionizationmass spectrometry in this study.展开更多
The ion exchange characteristics of Amberlite IRA 743 resin for extracting boron from aqueous fluids have been investigated in detail. The results show that Amberlite IRA 743 resin, a boron specific ion exchange resi...The ion exchange characteristics of Amberlite IRA 743 resin for extracting boron from aqueous fluids have been investigated in detail. The results show that Amberlite IRA 743 resin, a boron specific ion exchange resin, can quantitatively extract boron as the B(OH) - 4 species from weakly basic solution. Some exchangeable anions such as Cl - and SO 2- 4 are present, resulting in an increase in pH value of the loaded solution within the column, and the boron in natural aqueous fluids with low pH is also extracted by Amberlite IRA 743 resin. However, the volume of loaded solution must be restricted. The maximum volume of loaded solution giving quantitative extraction of boron decreases for sample solutions of lower pH value. Warm HCl solution is more effective than room temperature HCl solution for eluting boron from Amberlite IRA 743 resin.展开更多
文摘An improved procedure for extraction and purification of boron from naturalsamples is presented. The separation and purification of boron was carried out using aboron-specific resin, Amberlite IRA743, and a mixed ion exchange resin, Dowex 50W * 8 and IonExchanger II resin. Using the mixed ion exchange resin which adsorbs all cations and anions exceptboron, the HCl and other cations and anions left in eluant from the Amberlite IRA 743 were removedeffectively. In this case, boron loss can be avoided because the boron-bearing solution does nothave to be evaporated to reach dryness to dislodge HCl. The boron recovery ranged from 97.6% to 102%in this study. The isotopic fractionation of boron can be negligible within the precision of theisotopic measurement. The results show that boron separation for the isotopic measurement by usingboth Amberlite IRA 743 resin and the mixed resin is more effective than that using Amberlite IRA 743resin alone. The boron in samples of brine, seawater, rock, coral and foraminifer were separated bythis procedure. Boron isotopic compositions of these samples were measured by thermal ionizationmass spectrometry in this study.
基金theNationalNaturalScienceFoundationofChina (No .40 173 0 13 )
文摘The ion exchange characteristics of Amberlite IRA 743 resin for extracting boron from aqueous fluids have been investigated in detail. The results show that Amberlite IRA 743 resin, a boron specific ion exchange resin, can quantitatively extract boron as the B(OH) - 4 species from weakly basic solution. Some exchangeable anions such as Cl - and SO 2- 4 are present, resulting in an increase in pH value of the loaded solution within the column, and the boron in natural aqueous fluids with low pH is also extracted by Amberlite IRA 743 resin. However, the volume of loaded solution must be restricted. The maximum volume of loaded solution giving quantitative extraction of boron decreases for sample solutions of lower pH value. Warm HCl solution is more effective than room temperature HCl solution for eluting boron from Amberlite IRA 743 resin.
