Nu Instruments Perspective是为灵活性,高性能和可靠性而设计的,它能够从zei小的样品中实现精确的测量。具有标准收集器块的透视图,为测量碳,氮,氧,硫和氢的常规稳定同位素比率应用提供了新的基准。添加IS收集器块,将仪器转换为透视IS,其具有以非常灵敏度和线性度分析结块同位素的能力。
样品制备
Nu Carb是一种紧凑型台式双入口碳酸盐装置,可在小碳酸盐样品上提供高精度同位素比例测定。它可以与高灵敏度高分辨率透视同位素比质谱仪连接。
主要特征
高效率离子源,内置聚焦透镜
霍尔探头稳定电磁铁
独特的SIRMS收集器阵列使用zl的“可变变焦光学”
任何商业IRMS的zei大质量分散
质量分辨率CNOS和H (m/Δm) > 200
(10% valley) < >
zei先进的电子和软件
The Nu Instruments Perspective is designed for flexibility, high performance and reliability, it has the ability to achieve precise measurements from the smallest sample. The Perspective with its standard collector block sets a new benchmark in performance for routine stable isotope ratio applications for the measurement of carbon, nitrogen, oxygen, sulphur and hydrogen. The addition of the IS collector block, transforms the instrument into the Perspective IS, which has the capability to analyse clumped isotopes with exceptional sensitivity and linearity.
Sample Preparation
The Nu Carb is a compact bench-top dual inlet carbonate device that offers high precision isotope ratio determinations on small carbonate samples. It can be interfaced with the high sensitivity high resolution Perspective isotope ratio mass spectrometer.
Key Features
High efficiency ion source with integral focussing lenses
Hall probe stabilised electromagnet
Unique SIRMS collectors arrays using patented “Variable Zoom Optics”
Largest mass dispersion of any commercial IRMS
Mass resolution CNOS and H (m/Δm) > 200 (10% valley) < >
State-of-the-art electronics and software
The Nu Instruments Nu PERSPECTIVE IRMS is a state of the art stable isotope ratio mass spectrometer designed for flexibility, high performance, and reliability, together with a user friendly instrument control software and data analysis suite.
This next generation instrument has a wealth of novel features, giving the ultimate in performance for both routine and research applications for stable isotope ratio measurements.
The combination of the analyser geometry- field proven in the Nu Instruments Noblesse noble gas mass spectrometer- and the use of the “zoom optics” (Nu patent) gives an equivalent dispersion for CO2 of 60cm – the largest in any commercially available IRMS instrument.
The ion source sensitivity in dual inlet mode has been determined at <600 molecules/ion (for CO2 at mass 44) at 10kVz
Nu PERSPECTIVE ion source
All ion source parameters are under computer control, with storage of the tuning parameters for each sample gas and isotope ratio to be measured.
The ion source has integral focussing lenses (bidirectional focussing in both the vertical and horizontal planes) giving 100% transmission of ions through the analyser.
Low (<10ppm/nA) and stable (<0.03 ppm/nA/hour) H3+ formation- essential for precise D/H analysis
Integral ion source heater (temperature up to 200oC)
Nu PERSPECTIVE magnetic sector analyser
Variable mass dispersion of up to 60cm effective magnetic deflection radius (varies with the use of the patented zoom lens)
Mass range 2 to 150, mass resolution (m/Δm, 10% valley) >200
Simultaneous collection of from 2 to 6 ion beams, with 10 collectors fitted as standard to permit the simultaneous measurement of either masses 2,3; 28,29,30; 44,45,46,47,48,49; or 64,65,66,68
High stability electromagnet supplied as standard
High efficiency, narrow entrance, and deep Faraday collectors are used, that uniquely provide high resolution on all collectors
The combination of the analyser geometry and electromagnet gives high spatial separation of masses 2 and 3, allowing the measurement of D/H ratios in H2 in a helium carrier gas without the need for any additional ion optic elements
Nu PERSPECTIVE vacuum system
True differential pumping is supplied as standard, by three BOC Edwards EXT75 70 litre/second water cooled long lifetime turbomolecular pumps, with high compression ratio for pumping of light gases (e.g. He and H2). One BOC Edwards rotary backing pump, floor standing (inside the PERSPECTIVE cabinet)
Penning gauge for measurement of ion source pressure, with computer monitoring of both turbomolecular pump rotation speeds and temperatures, with automatic shutdown in the case of vacuum failure
Nu PERSPECTIVE instrument control and data acquisition electronics
Single module ion source supplies unit, fully computer controlled
Rack mounted data acquisition and control PCBs mounted in separate and isolated module
Nu PERSPECTIVE data system and software
Comprehensive and easy to use Windows® based control software
Full colour display of all operating parameters, e.g. ion beams, pressure gauge
True multitasking operation
Nu PERSPECTIVE reference gas injection and continuous-flow IRMS interfacing
Reference gas injection system for 5 gases (CO2 N2,H2, CO, and SO2)
Computer controlled dilutor (variable from no dilution up to 30x dilution)
Pneumatic isolation valve to isolate the ion source
Installation Requirements
Dimensions cm (width) x cm (depth) x cm (height)
Single phase power supply 230V/15A required
Compressed air @ 90psi for pneumatic valves
Closed loop water chiller/recirculator (for turbomolecular pump cooling).
Nu PERSPECTIVE Continuous Flow IRMS performance specifications
EA-IRMS mode -sample combustion to CO2, N2, or SO2 with EuroVector Elemental Analyser
Gas and isotope ratio
| Reference Gas Precision (1σ, n=10, 15nA peaks) | EA-IRMS external precision (1σ, n=10) | Sample Size (absolute elemental amount in capsule) |
CO2 (13C//12C) | 0.06‰ | 0.1‰ | 50µg |
CO2 (13C/12C) | 0.3‰ | 15-300 | |
N2 (15N/14N) | 0.06‰ | 0.1‰ | 50µg |
N2 (15N/14N) | 0.3‰ | 20-400µg | |
SO2 (34S/32S) | 0.1‰ | 0.1‰ | 50µg |
Pyrolysis mode –solid or liquid sample pyrolysis to CO and H2 with a HEKAtech Unit 1700oC High Temperature Carbon Reduction Furnace
Gas and isotope ratio | Reference Gas Precision (1σ, n=10, 15nA peaks) | Pyrolysis external precision (1σ, n=10) | Sample Size (absolute elemental amount) |
H2 (D/H) | 0.2‰ | 3‰ | 25µg (solid) |
H2 (D/H) | 3‰ | 30-150µg (solid) | |
H2 (D/H) | 2.0‰ | 0.5µl (liquid) | |
CO (18O/16O) | 0.1‰ | 0.3‰ | 50µg (solid) |
CO (18O/16O) | 0.6‰ | 25-250µg (solid) | |
CO (18O/16O) | 0.2‰ | 0.5µl (liquid) |
Nu Instruments GC-combustion/pyrolysis-IRMS interface
For on-line measurement of δ 13C, δ 15N and δD in organic compounds that are separated by capillary gas chromatography. The helium carrier gas is switched between the FID or the combustion / pyrolysis of components of interest in an oxidation or pyrolysis furnace.
Water is removed from the products of combustion using a Nafion dryer.
For δ15N measurements any N oxides are reduced to N2 using a low dead volume reduction furnace and CO2 is removed using a low dead volume liquid N2 trap.
Pulses of pure reference gas are automatically introduced into the HORIZON ion source for best possible precision and accuracy.
N.B. when determining δD via the high temperature pyrolysis furnace, at the start of the GC run 3 (or more) reference gas peaks of H2 are introduced at different major ion beam values to determine automatically the H3+ correction for the GC run.
The GC combustion/pyrolysis interface includes:
An Agilent Technologies 7890A Gas Chromatograph fitted with one capillary split/splitless injector and EPC
One Flame Ionisation Detector (FID) fitted with heart cut valve
Oxidation furnace, interfaced to the 7890A, with temperature controller (maximum temperature 1200oC)
Pyrolysis furnace, interfaced to the 7890A, with temperature controller (maximum temperature 1450oC)
The combination of the Agilent 7890A GC together with the PERSPECTIVE IRMS meets the following specifications:
Precision <0.2‰ for δ13C, <1.0‰ for δ15N, and <3‰ for δD
For the measurement of δ13C the above precision is met with >0.8 nanomoles (10ng) of C on column; for δ15N >1.5 nanomoles (42ng) of N2 on column; and for δD >15 nanomoles (30ng) on column.
Included will be a 30m DB-5MS 0.25mm x 0.25µm GC column
Optional autosamplers available include the Agilent 7693A, CTC GC PAL & COMBI PAL units, and the Gerstel MPS2L
ADDITIONAL SAMPLE PREPARATION ACCESSORIES
Nu Instruments “GasPrep” System
Continuous Flow Water Equilibration & Carbonate/Phosphoric Acid Reaction System
A Nu HORIZON system installed in the KISR, Kuwait (GasPrep System in the centre)
Nu Instruments has developed a new sample preparation unit to be used with the Nu PERSPECTIVE and Nu HORIZON Isotope Ratio Mass Spectrometer instruments.
The unit uses an autosampler similar to the Gilson Model 222XL, and is fitted with a temperature controlled block that can house up to 100 industry standard “Exetainer” septum capped glass vials.
When used for equilibration of water (H2O) with either CO2 (for 18O/16O analysis) or H2 (for D/H analysis) the performance specifications, (when used with a PERSPECTIVE or HORIZON IRMS in continuous flow mode of operation) are as follows:
δ18O (as CO2) Sample Size >500µl H2O External Reproducibility <0.1‰
δD (as H2) Sample Size >200µl H2O External Reproducibility <2.0‰
The unit can also be used to sample CO2 prepared from carbonate samples (e.g. DIC, solid carbonates) by the addition of phosphoric acid to the carbonate samples followed by automated determination of 13C/12C and 18O/16O ratios.
In carbonate mode the specifications are:
δ18O (as CO2) Sample Size >50µg CO32- External Reproducibility <0.08‰
δ13C (as CO2) Sample Size >50µg CO32- External Reproducibility <0.06‰
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