Hou-Chun Liu

National Cheng Kung University | NCKU · Department of Earth Sciences

Zr-EEN isobaric interference correction coupled with the ⁸⁴ Sr– ⁸⁷ Sr double spike method allows highly accurate and precise δ 88/86 Sr determination on a MC-ICP-MS.

This study investigated whether stable strontium isotope (⁸⁸Sr/⁸⁶Sr) fractionation occurs during nutrient uptake by bean plants. Mung and soy beans were cultivated hydroponically using two nutrient solutions with different strontium (Sr) isotope compositions. The Sr and calcium (Ca) concentrations, ⁸⁷Sr/⁸⁶Sr ratios and δ88/86Sr values of the seeds,...

Radiogenic and stable Sr isotope ratios (⁸⁷Sr/⁸⁶Sr, δ88/86Sr) serve as potential tracers for evaluation of weathering sources and associated physicochemical processes in terrestrial environments. Despite carbonate weathering sourcing two-thirds of the total continental Sr flux to the ocean, however, few attempts have been aimed at studying stable S...

Mud volcano is one of the most important conduits for deep seated materials to migrate upward in sedimentary basins, convergent margins, and subduction zones. Understanding their temporal and spatial characteristics and variations provides us the important information on fluid sources and chemical compositions at depth. Mud volcano Lei-Gong-Huo (MV...

The Tatun Volcanic Group (TVG) in northeast Taiwan is characterized by fumaroles and acid hot springs, which are indicative of underlying magma activities and release some hazardous elements to the environment. However, the hydrogeology in this hydrothermal system is still unclear and therefore sources of chemicals undefined. This study combined re...

Two new macro-sublimation methods allowing processing of larger sample volumes with lower concentration requirements in solution are developed and systematically assessed. Development of these methods involved the design of two new pieces of lab apparatus; 15-mL Savillex PFA vial with home-made double-layer device (0.5 mL) and an independent two-bo...

Numerous investigations on aquatic heavy metal distributions in Asia reveal that the riverine and coastal sediments are the major heavy metal carriers responsible for anthropogenic activities. The mobility and accumulation of heavy metals in those sediments are therefore the fundamental knowledge for risk assessment on biotic species. To better con...

The upper Cambrian SPICE event is an ongoing topic in terms of global paleo­environmental changes. The nature of this stable carbon isotope positive excursion coincides with one of the most recognizable trilobite turnover events in the Late Cambrian is still under debate. Most stable carbon isotope SPICE signals were reported from deeper water sett...

A protocol for highly accurate and precise determination of Sr isotope ratios in plant materials, 87Sr/86Sr and δ 88/86Sr, by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) is presented in this study. An Eichrom Sr resin was used for matrix separation and an improved Zr empirical external normalization coupled with standar...

Radiogenic Sr isotopes (87Sr/86Sr) are robust for provenance identification in hydrology, affected mainly by the age of background lithologies and the degree of chemical weathering. However, there is limited knowledge concerning the fractionation mechanism of stable Sr isotopes (88Sr/86Sr) in rivers. In this study, river water was collected on a we...

Isotopic compositions of B and Sr in rocks and sediments can be used as tracers for plant provincial sources. This study aims to test whether tea leaf origin can be discriminated using 10B/11B and Sr isotopic composition data, along with concentrations of major/trace elements, in tea specimens collected from major plantation gardens in Taiwan. The...

Monthly atmospheric deposition was collected in Northeast of Sichuan Province from August 2011 to July 2012. Contents of Na, Mg, Ca, K, Si, Sr, Ba and Zn in weak-acid leachable fraction (with pH values of ca. 2) of the deposition were determined using ICP-MS. The results indicated that the deposition fluxes of all these elements exhibited notable s...

We describe a method for rapid, precise and accurate determination of calcium ion (Ca(2+)) concentration in seawater using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS). A 10 μL aliquot of seawater was spiked with an appropriate (43)Ca enriched solution for (44)Ca/(43)Ca ID-ICP-MS analyses, using an Element XR (Thermo Fi...

Mud volcanoes are important gateways for deep fluids to migrate upward and provide windows for studying fluid/sediment interaction at depth. Fluids emitted from 40 terrestrial mud volcanoes were collected in southern and eastern Taiwan to study their chemical compositions, including H, O and Sr isotopes (87Sr/86Sr and δ88/86Sr). Relative to seawate...

Boron (B) isotopes are sensitive tracers for constraining water–rock interactions and pollution sources in river systems. In this study, we analyzed d11B using multi-collector inductive coupled plasma mass spec- trometry, in addition to major and trace elements, to delineate B sources and transport mechanisms in two river catchments, the largest Ka...

River waters collected weekly over the whole year of 2007 from the Buha River draining to Lake Qinghai on the northeastern Tibetan Plateau were analyzed for major ions and Sr isotopes. Dissolved loads in the river exhibit distinct seasonal variability in major cation ratios and Sr isotopes over the 1 year period, reflecting seasonal differences in...

a b s t r a c t High turbidity in water reservoirs during the monsoon season has caused serious problems for drinking water quality in Taiwan. In this study, we collected stream waters and streambed sediments, including bed loads and fresh landslide deposits, in the Dahan Stream and analyzed 101 87 Sr/ 86 Sr ratios in different grain-size fractions...