Citation: YANG Jian, MA Yun-Qi, LI Xing-Yi, LIU Yu-Xiu, HAN Feng-Qing, ZHANG Yan-Ling, Syed Asim Hussain, LI Hai-Jun. Application of Ethylenediaminetetraacetic Acid Disodium Salt to High Precision Measurement of Isotope of Boron in Acid-soluble Fraction of Sediments[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(9): 1433-1439. doi: 10.19756/j.issn.0253-3820.191113 shu

Application of Ethylenediaminetetraacetic Acid Disodium Salt to High Precision Measurement of Isotope of Boron in Acid-soluble Fraction of Sediments

YANG Jian ^1,2,4, ,
MA Yun-Qi ^1,2,3 ,
LI Xing-Yi ^1,2,4 ,
LIU Yu-Xiu ^1,2,3 ,
HAN Feng-Qing ^1,2,4 ,
ZHANG Yan-Ling ^1,2 ,
Syed Asim Hussain ^1,2,4 ,
LI Hai-Jun ³

1.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Chinese Academy of Sciences, Xining 810008, China;
2.
Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
3.
Salt Lake Chemical Analyzing and Testing Center, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
4.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 28 February 2019
Revised Date: 20 May 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No.41473117).

When nature sediments (e.g. clay/carbonate sediments) are dissolved by hydrochloric acid, a large number of metallic ions such as Ca, Mg, Fe, Al and rare earth elements are released. These metal ions make large amount of water-insoluble hydroxide precipitate under alkaline condition which can easily absorb and affect the extraction of boron (B) along with boron isotope composition (δ¹¹B) determination. In this work, it was proved that when the solution was adjusted to alkalescent, adding an appropriate EDTA-2Na could effectively avoid insoluble hydroxide precipitation. The interference of EDTA-2Na to boron isotope determination was effectively reduced by rinsing the resin with ammonia after the alkalescent solution passing through the boron specific resin and extending the ionization time of simples in the measurement process. After the entire process, the recovery rate of boron was more than 95%, and the boron isotopic ratio of NIST SRM 951 ranged from 4.05146 to 4.05628. The boron isotopic composition (δ¹¹B) of sediment of Sanya, Dachaidan lacustrine and Dachaidan intercrystalline were +17.64‰, -5.74‰ and +1.8‰, respectively. This method could meet the need of the high-precision determination of boron isotope of sediments such as clay sediments, carbonate sediments, loess and paleosol. In addition, this study provided a simple and low interference pretreatment method for high-precision determination of boron isotope.
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