Inorganic Geochemistry

Sample preparation room

概要
This room is for sample preparations for rare/trace element analyses that is potentially-impacted by dust-particles. This room has very low level of environmental pollutants such as dust, airborne microbes and aerosol particles because the air in the room is rentilated through fine pore size filters (High Efficiency Particulate Air Filter : HEPA).

Double-Focusing High Resolution ICP Multi-Collector Mass Spectrometer (ICP-MC-MS)

This mass spectrometer is designed for analyzing isotope ratios of high ionization potential elements precisely owing to the high ionization efficiency of ICP and its relatively constant mass discrimination over time. Simultaneous detection of multiple isotopes separated through a sector magnetic field is capable with an array of nine ion detectors. The forward Nier-Johnson double-focusing geometry allows operations under high resolution modes for e.g. Mg and Fe isotopes as well as low resolution mode operation.

Model

Neptune

Manufacture

Thermo Fisher Scientific. Inc.

Operating condition

Nine Faraday cups and three ion counters are equipped in an array with a mass dispersion of 17% for simultaneous detection of multiple ions to determine precise isotope ratios of elements.

Application	・Precise Pb isotopic analysis with Tl-doping technique ・Detection of small isotopic fractionation of stable isotopes (currently Li, Mg, Zn, Mo, Sb, Eu, W)

Lab.

ICP-MS

Thermal Ionization Mass Spectrometer (TIMS)

Thermal ionization mass spectrometer (TIMS) is used for isotope analyses of various geological samples. In TIMS, a salt of the element, chemically separated from the sample, is evaporated onto the metal filament (rhenium, tantalum, tungsten, etc.). The filament is heated at high vacuum, and the emitted ions of the element are separated on the basis of their mass using a magnetic sector mass analyzer. Then the separated ion beam is detected by Faraday cup.

Model

TRITON TI

Manufacture

Thermo Fisher Scientific. Inc.

Operating condition

TRITON equips nine Faraday cups, which allows simultaneous measurement of the intensities of several ions beams. From the intensities of the ions beams, ratios of different masses are calculated to obtain precise isotope ratios of the sample.

Application

・Precise isotope analyses of strontium (87Sr/86Sr) in carbonates, sediments, rocks and natural waters. Low level of strontium, as small as 10 ng, is possible to measure.

・Precise isotope analyses of neodymium (143Nd/144Nd) in sediments and rocks. Low level of neodymium, as small as 10 ng, is possible to measure.

・Precise isotope analyses of boron (11B/10B) in carbonates, sediments, rocks and natural waters (analytical technique in development).

Lab.

Inorganic Geochemistry

Isotope Ratio Mass Spectrometer (IR-MS)

Model
This Mass Spectrometer is for isotopic analyses of carbonates, the acid dissolution for use with solid or gas samples to study O, N, and C isotopes.
Thermo-Finnigan MAT 253 Mass Spectrometer
Manufacture
Thermo Fisher Scientific. Inc.
Operating condition
This instrument is equipped with a dual inlet system: a) a external system for purified gas samples collected by "Kiel device III" and b) a gear system for up to 24 small samples with automatic tube crackers.
Lab.
Inorganic Geochemistry

IsoPrime

Model

IsoPrime

Manufacture

Isoprime Ltd

Operating condition





Publications	Harada, N., Ahagon, N., Sakamoto, T., Uchida, M., Ikehara, M., and Shibata, Y., Rapid fluctuation of alkenone temperature in the southwestern Okhotsk Sea during the past 120 kyr, Global and Planetary Change, 53, 29-36 (2006). Kameo, K., Okada, M., El-Masry, M., Hisamitsu, T., Saito, S., Nakazato, H., Ohkouchi, N., Ikehara, M., Kitazato, H., and Taira, A., An age model and physical properties of the upper Quaternary core sediments in the Choshi area, central Japan, and their paleoceanographic significance, The Island Arc, 15 (3), 366-377 (2006). Sakamoto, T., Ikehara, M., Uchida, M., Aoki, Shibata, Y., K., Kanamatsu, T., Harada, N., Iijima, K., Katsuki, K., Asahi, H., Takahashi, K., Sakai, H., Kawahata, H., Millennial-scale variations of sea-ice expansion in the southwestern part of the Okhotsk Sea during 120 kyr: Age model, and ice-rafted debris in IMAGES Core MD01-2412, Global and Planetary Change, 53, 58-77 (2006).

Lab.

Inorganic Geochemistry

Quadrupole Inductively Coupled Plasma Mass Spectrometer (ICP-MS)

This mass spectrometer counts ions of elements typically in solution phase. The ions generated at the plasma at 1 atm are extracted into the high-vacuum region through a series of cones, and an objective ion is separated from others through a quadrupole mass filter on the basis of their mass-to-charge ratio. Mass number is characteristic of a particular element, and detection of ions of many elements at a time is possible through a high-speed scanning of a mass range by the quadrupole mass filter. The instrument has no extraction lens to reduce undesirable matrix effects for high matrix element samples at the sacrifice of signal sensitivity. This instrument also equips Dynamic Reaction Cell to neutralize interferences like Ar+ and ArO+ on Ca+ and Fe+ analyses with NH3 reaction gas, and the detection limit is less than 1 ppb for most elements.

Model

Elan DRCII

Manufacture

PerkinElmer, Inc.

Operating condition

Application	Direct dilution analysis of REE, HFSE, B, U, Th, Pb etc. in silicate and carbonate samples Ca isotopic analysis in DRC mode

Lab.

ICP-MS

Inductively coupled plasma atomic emission spectrometer (ICP AES)

ICP atomic emission spectrometer is an instrument which detects emitted electromagnetic radiation from excited atoms and ions produced in ICP through diffraction grating. The emission spectrum is characteristic of a particular element, and the intensity is proportional to the concentration of the element in the sample. A combination of Echelle grating and CCD array detector in this instrument allows simultaneous detection of multiple emission lines of elements. Both wide dynamic range and low detection limit are achieved by dual-view of ICP (radial and axial plasma view). Although ICPAES is less sensitive compared to ICPMS, this instrument has advantages in robustness to matrix effects and signal stability because of the "optical" spectrometry without intake sample itself into the instrument.

Model

Optima DV4300

Manufacture

PerkinElmer, Inc.

Operating condition

Application	Mg/Ca and Sr/Ca elemental ratio of carbonates with other trace element analysis Major and trace element analysis of sediments

Lab.

ICP-MS

Atomic Absorption Spectrometer

Model
Atomic absorption spectroscopy is a technique for determining the concentration of a particular metal element in a sample. The technique typically makes use of a flame or graphite furnace to atomize the sample. The electrons of the atoms in the atomizer can be promoted to higher orbitals for an instant by absorbing a set quantity of energy. This amount of energy is specific to a particular electron transition in a particular element. This gives the technique its elemental selectivity.
AAnalyst800
Manufacture
PerkinElmer Japan
Operating condition
Direct determination for Alkaline and Alkaline earth elements
Lab.
Inorganic Geochemistry

Kochi Core Center