第175期同位素论坛时间为2021年5月14日9：00，地点为周隆泉楼A3-206。
本期论坛主持人为马露琦，共有4人作报告：
杨紫菲：
The slowly sedimentation, bioturbation and organic matter degradation as reviewed by excess 230Th and 210Pb in the Cosmonaut Sea sediments
1. The bioturbation intensity is firstly quantified in the East Antarctic Cosmonaut Sea.
2. The bioturbation and microbial activities are inactive within the Cosmonaut Sea.
3. The sedimentary environment of the Cosmonaut Sea is conducive to the preservation of organic matter.
王昕：
Thorium and protactinium isotopic and concentration measurements by high resolution single receiver inductively coupled plasma mass spectrometry (HR-SC-ICP-MS)
1. 230Th和231Pa 同位素测量实验方法的建立和优化.
2. Element XR 测量方法的建立.
3. 南海北部230Th和231Pa的分布.
许子夫：
Getting high purity phosphate from multitype of samples for oxygen isotope analyses by 1-Hexanol extraction
1. Theoretical basis of the method proposed in this study.
2. Verification of the feasibility of the new method.
3. Purity of silver phosphate produced by new method.
杨睿：
Tracing Phosphorus sources in Jiulong River: Insights from phosphate oxygen isotope ratios
1. Research significance of oxygen isotopes of phosphates.
2. Distribution characteristics of oxygen isotopes of phosphates in JiuLong River.
3. Oxygen isotopes of phosphates trace phosphorus sources.
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