Citation: ZHANG Yan-Ling, XIAO Ying-Kai, MA Yun-Qi, LIU Zhi-Qi, WANG Jun-Lin, LIU Yu-Xiu. Correlation between Boron Isotope of Coral Acropora and pH Value of Seawater Surface[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(1): 138-146. doi: 10.19756/j.issn.0253-3820.181516 shu

Correlation between Boron Isotope of Coral Acropora and pH Value of Seawater Surface

ZHANG Yan-Ling ^1,2, ,
XIAO Ying-Kai ^1,2 ,
MA Yun-Qi ^1,2 ,
LIU Zhi-Qi ^1,2 ,
WANG Jun-Lin ³ ,
LIU Yu-Xiu ^1,2

1.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
2.
Qinghai Provincial Key Laboratory of Salt Lakes Geology and Environment of Qinghai Province, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;
3.
Ningxia University, Yinchuan 750021, China

Received Date: 6 August 2018
Revised Date: 12 November 2018

Fund Project: This work was supported by the National Natural Science Foundation of China(Nos. 40976074, 41403014, U1607104).

Water circulation system with the almost same element composition and socket type were adopted in coral Acropora culture under different seawater pH conditions and the experimental data of the relationship between boron isotopic compositions of coral and seawater pH were obtained by thermoelectric ionization mass spectrometer. From the correlations between α_carb-3 of coral and pH of cultured seawater, α_carb-3 was not a constant but related to pH, indicating that B(OH)₃ also incorporated carbonate. Therefore, the theoretical formula could not be used to calculate the seawater pH value from the δ¹¹B_carb value of the measured marine biological carbonate. The method using the empirical equations obtained experimentally to calculate the seawater pH value would be an alternative. In addition, a mixed precipitation of inorganic CaCO₃ and Mg(OH)₂ was found in aquaculture tanks with high pH value and the δ¹¹B of the solid was significantly higher than that of cultured seawater. The result indicated that the presence of Mg(OH)₂ had a significant effect on the boron isotope fractionation, which deserved our attention.
- Boron isotope,
- Fractionation factor,
- pH value,
- Magnesium hydroxide,
- Coral culture
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