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Welcome to the NSI Lab at NCKU

The Non-traditional Stable Isotope Laboratory (NSI), housed in the Department of Earth Sciences, was inaugurated in Fall 2020 supported by a substantial grant from the Ministry of Science and Technology (MOST) and National Cheng Kung University (NCKU). The lab director is Dr. Hou-Chun Liu.


NSI explores our planet's environmental and climatic changes through isotopic geochemistry. The laboratory includes a clean laboratory for sample preparation experiments and several instruments for trace element concentration analysis. NSI has technologies for purification and isotopic analysis of many elements and we are committed to improving the efficiency and reliability of these technologies. Furthermore, we have a strong connection with the Isotope Geochemistry Laboratory (IGL) and have established high precision and accuracy methods for non-traditional stable isotope analyses on IGL's Multicollector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS, Neptune, Thermo-Fisher Scientific). Learn more about NSI facilities below.

Clean Laboratory

NSI has a Class-1000 clean room for sample pretreatment and elemental purification. We have a Mettler-Toledo balance for precise spiking and weighing and a Millipore system for ultrapure water supply. For ultraclean processing, all sample digestion and matrix separation experiments were performed on Class-10 airflow working benches.

Trace-elemental Analyses

NSI installed a high-performance inductively coupled plasma optic emission spectrometer (ICP-OES, Arcos, Spectro) in July 2022. The SPECTRO ARCOS precisely analyzes the elemental composition of major and trace metals from a spectral range between 130—770 nm to deliver the critically accurate measurements that academia and industry can depend on. The limits of quantification of NSI’s device are given below.

Isotopic Analyses

NSI has an array of isotopic methodologies established on IGL’s MC-ICP-MS (Neptune, Thermo-Fisher Scientific), especially high precision and accuracy stable Sr isotopic determinations. We also routinely measure radiogenic isotopic ratios of Sr and Nd. See more about the MC-ICP-MS on the IGL webpage .

NSI is funded by the Ministry of Science and Technology and National Cheng Kung University. NCKU and non-NCKU are invited to use our facility, we welcome any form of research collaboration.


選修專業課程 “穩定同位素地球化學”、“分析地球化學與資料科學” 或是開設於理學院的密集課程 ,可以幫助你了解NSI的同位素地球化學相關技術與貴重儀器原理。

🕑 Update: July 5, 2022