磷酸盐氧同位素技术在环境科学中的研究进展

Progress on phosphate oxygen isotope technology in environmental science

近年来,由于磷素流失造成的环境问题日益严重,查明环境中磷的来源及迁移转化对于改变目前现状具有重要意义。而磷酸盐氧同位素作为一种地球化学示踪剂在水体环境、土壤以及古环境研究中得到了广泛应用。本文总结了不同自然界物质中磷酸盐氧同位素组成(δ^(18)O_P),分馏机理,分离、纯化和测试方法以及在环境科学中的应用研究进展。在此基础上,提出未来研究工作展望:根据不同样品的基本性质选择不同的分离、纯化方法,磷酸盐氧同位素分馏机制及原因仍存在不确定性,需进一步研究,磷酸盐氧同位素应用前景有待进一步扩展。

Recently, environmental pollution caused by phosphorus （P） loss has become an increasingly serious problem. Therefore, it is significant to identify the sources, migration and transformation of P in the environment. The oxygen isotope composition of phosphate （δ^18OP） represents a powerful tracer, which has been widely used for investigations of aquatic ecosystems, soils and paleoenvironments. This article discusses the δ^18OP composition of natural substances and related fractionation mechanisms as well as the separation and purification of phosphate from environmental samples and introduces the application of δ^18OP analyses in environmental science. According to the progress and problems of previous research, some modifications and improvements should be put forward for future studies： The methods of separating and purifying of δ^18OP should be selected according to the sample properties; fractionation mechanisms and applied prospects of δ^18OP in environment need to be further studied.