Li Sumei, Du Chengyu, Jin Xin, Yang Jing, Zhang Wei, Li Simin
School of Energy and Environmental Engineering, Hebei University of Engineering, Handan, Hebei 056038, China; College of Ocean and Earth Sciences, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361102, China E-mail:
School of Energy and Environmental Engineering, Hebei University of Engineering, Handan, Hebei 056038, China.
Water Sci Technol. 2023 Aug;88(3):694-710. doi: 10.2166/wst.2023.241.
Phosphate oxygen isotope analysis is an effective tool for investigating phosphorus migration and transformation in water bodies. Unfortunately, current pretreatment methods for this technology are significantly limited due to their demanding sample amount requirements, complex operation, and limited scope of application. In order to enhance the efficiency of the pretreatment process, hydrated zirconia was synthesized through liquid-phase precipitation. Zeolite, D001 macroporous resin, activated carbon, and ceramsite were chosen as possible candidate materials for loading purposes. The optimal zirconium loading material was identified through a combination of field enrichment and laboratory elution experiments. The ideal in situ enrichment duration, material dosages, and elution time were ascertained using response surface methodology. The findings showed that D001 resin exhibited superior selective adsorption and elution capacity for phosphate. The response surface optimization yielded the optimal parameters for the in situ phosphate-enrichment blanket: a mass of 13 g for zirconium-loaded D001 resin, an enrichment period of 360 min, and an elution period of 853 min. The attainment of a bright yellow AgPO solid after purification served as proof of the reliability of the optimization method. The obtained results provide a fundamental basis for the preparation and application of phosphate oxygen isotope analysis in freshwater ecosystem.
磷酸盐氧同位素分析是研究水体中磷迁移和转化的有效工具。不幸的是，由于该技术目前的预处理方法对样品量要求高、操作复杂且应用范围有限，受到了显著限制。为提高预处理过程的效率，通过液相沉淀法合成了水合氧化锆。选择沸石、D001大孔树脂、活性炭和陶粒作为可能的负载候选材料。通过现场富集和实验室洗脱实验相结合的方式确定了最佳锆负载材料。使用响应面法确定了理想的原位富集持续时间、材料用量和洗脱时间。结果表明，D001树脂对磷酸盐表现出优异的选择性吸附和洗脱能力。响应面优化得出了原位磷酸盐富集层的最佳参数：负载锆的D001树脂质量为13 g，富集时间为360 min，洗脱时间为853 min。纯化后获得亮黄色AgPO固体证明了优化方法的可靠性。所得结果为淡水生态系统中磷酸盐氧同位素分析的制备和应用提供了基础依据。
