ICP-Mass Spectrometer
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1 ICP-Mass Spectrometer
2 New Mass Spectrometers
3 The main issue: sequential vs. simultaneous Scanning, peak hopping are sequential Like viewing a photo through a peephole One pixel at a time Other parts of photo are invisible Even worse: viewing a movie through a peephole The most important parts always seem to be where you are NOT looking!
4 QuickTime and a decompressor are needed to see this picture.
5 Concept: Electronic Photoplate Truly simultaneous High spatial resolution Fast recording Direct integration Broad dynamic range Linear Stable; simple storage Immediate readout SSMS photoplate courtesy of D.W. Koppenaal
6
7 Mattauch-Herzog Mass Spectrograph Electrostatic Analyzer Ion Optics Magnetic Sector (1-10 KG) 80 cm Entrance Slit Extraction Optic Focal Plane Camera
8 QuickTime and a Cinepak decompressor are needed to see this picture.
9 New Multichannel Detector Faraday-strip detection One count per ion (no amplification) No thermionic emission No dynode statistics No dependence on ion mass Continuous integration and random access of m/z Nondestructive or destructive readout option Extended dynamic range; repetitive read
10 FPC-128 Multichannel Detector Time for one spectrum ms Reset FET 1000 ff Two gain levels Faraday Strip 45µ fingers 10 ff 1000 ff 0.16 V / e тidt OA Multiplexer 5µ spacing 10 ff 15.8 V / e 1 Vout = C x128
11 Data Acquisition DRO NDRO
12 Fingerboard
13 Fingerboard Channels
14 Put photo of ICP-ADAMS here FPC-128 Installed in MHMS FPC-128 Power Supplies
15 ICP-MHMS-FPC ICP FPC-128
16 Fixed Pattern Noise
17 Improved Resolution Operating Conditions Sample Intro. Laser Ablation Sample BNRM 44 (0.51% Mo) Integration Time 1 s MS Entrance Slit Width 100 µm 0.4 amu Resolution Peak Center Peak Width 0.12 FWHM R = 817
18 Simultaneous Isotope monitoring Mass Resolution 203 Pb, 206Pb, 207Pb, 208Pb 204 Tl, 205Tl µm wide pixels, 100 µm slit (old prototype detector with 32 pixels) 45 µm wide pixels, 100 µm slit (FPC 128) 45 µm wide pixels, 50 µm slit (FPC 128)
19 Limits of Detection (pptr) Element Li Be Mg Al V Cr Mn Fe Co Ni Cu Zn Ga As Se Sr FPC SEM Element Y Mo Ag Cd In Sn Sb Ba La Ce Ho W Ir Tl Bi U FPC SEM FPC 31-channel Focal-plane camera; SEM slit + single-channel electron multiplier
20 Elemental Analysis with the FPC Array Detector: Limits of Detection (ICP source) Bi Bi 203Tl 203 Tl Ir W W Ho Ho 193Ir 193 Limits of detection in the sub-part per trillion level for most elements Sn Sn Cd Cd Isotope 100Mo 100 Mo 8888Sr Sr 5555Mn Mn 5252Cr Cr V 4848Ti Ti 5151V Limits of detection (part pert trillion) Values determined using continuous sample introduction via an ultrasonic nebulizer 10 s integration time
21 Isotope Ratio Accuracy Isotope Ratio Accuracy (% Error)* Isotope Ratio FPC-128 FPC Ni/60Ni Sr/86Sr Mo/97Mo Cd/112Cd Sn/118Sn Sb/123Sb W/186W Ir/191Ir *No correction for mass bias
22 Isotope Ratio Accuracy Isotope Ratio Accuracy (% Error)* Isotope Ratio FPC-128 FPC Ni/60Ni Sr/86Sr Mo/97Mo Cd/112Cd Sn/118Sn Sb/123Sb W/186W Ir/191Ir *No correction for mass bias
23 Isotope Ratio Accuracy Isotope Ratio Accuracy (% Error)* Isotope Ratio FPC-128 FPC Ni/60Ni Sr/86Sr Mo/97Mo Cd/112Cd Sn/118Sn Sb/123Sb W/186W Ir/191Ir *No correction for mass bias
24 Isotope Ratio Accuracy Error Isotope Ratio Uncorrected Bias Corrected Sr/86Sr 14% 8% Mo/97Mo 11% 3% 4% 0.8% 120 5% 0.4% 121 5% 0.7% 4% 1% 3% 0.03% Cd/112Cd Sn/118Sn Sb/123Sb 184 W/186W 193 Ir/191Ir
25 Isotope-Ratio Precision
26 Isotope Ratio Precision 0.007% RSD, 3 minute integration
27 Elemental Analysis with the FPC Array Detector: Linear Dynamic Range Linearity over 7 orders 1pptr to 50 ppm Pixel full well capacity: ~105 charges (low gain) ~107 charges (high gain) Signal time
28 Where speed & simultaneous measurement really matter High-precision isotope ratios Optimal internal standardization Situations where the signal shape is critical Flow injection Electrothermal (carbon-furnace) vaporization Time-varying signals (e.g. LC, GC, CE) Modulation methods Fast transients (e.g. laser ablation)
29 Where speed & simultaneous measurement really matter High-precision isotope ratios Optimal internal standardization Situations where the signal shape is critical Flow injection Electrothermal (carbon-furnace) vaporization Time-varying signals (e.g. LC, GC, CE) Modulation methods Fast transients (e.g. laser ablation)
30 ETV-ICP-ADAMS
31 Electrothermal Vaporization Sample Introduction To ICP Cleaning Ar sweep gas I Temperature ( C) Ashing 1000 Drying 100 Vaporization Time (s)
32 Temporal Separation of Isobaric Interferences 1.5 ArO+ and Fe monitored at m/z = 56 during a full ETV cycle Signal Fe + Ar O Time (sec)
33 Elimination of Isobaric Overlaps Through Temperature Program Necessary m/z Resolving Power: ~330, μl injection, 10 ppb Cd and In solution Temperature Program Dry: 100 C, 90s Ash: 250 C, 10s Atomize: 1700 C, 4s Ramp: 250 C/s
34 ETV Limits of Detection (pptr) Isotope FPC SEM Isotope FPC SEM V Sn Cr Sb Mn Ba Co Ho Ni W Zn Ir Sr Tl Ag Bi Cd U s Integration Time FPC Focalplane camera SEM Single channel Secondary Electron Multiplier
35 ETV-ICP-ADAMS 1 ppm Sr and 10 ppb Y 2 s integration time All pixels at low gain (Pixels collecting 88Sr signals saturate at high gain) Signal for Y collected at high gain
36 Where speed & simultaneity really matter High-precision isotope ratios Optimal internal standardization Situations where the signal shape is critical Flow injection Electrothermal vaporization Time-varying signals (e.g. LC, GC, CE) Modulation methods Fast transients (e.g. laser ablation)
37 Laser Ablation ICP-ADAMS Setup Mattauch-Herzog Mass Spectrograph Cetac LSX-200 ICP He Sweep Gas Ar Make-up Gas
38 LA LODs Steady state, single shot Element Steady State (ng/g) Single Shot (fg) Element Steady State (ng/g) Single Shot (fg) B Sr Mn Ag Fe Au Co Tl Ni Pb 9 46 Cu Th Rb U
39 Laser Ablation ICP-ADAMS Shot-to-Shot Reproducibility Isotope %RSD Isotope %RSD 27 Al Cu Si Nb Cr Mo Mn Sn Fe W Ni Pb 12.2
40 Laser Ablation Precision Ultimate Precision: 0.02% RSD
41 Steel substrate NIST 1359B Copper on Brass 45um layer of Cu protective layer of Cr
42 NIST 1359B Copper on Brass 4-5nm depth resolution per pulse
43 Where speed & simultaneity really matter High-precision isotope ratios Optimal internal standardization Situations where the signal shape is critical Flow injection Electrothermal vaporization Time-varying signals (e.g. LC, GC, CE) Modulation methods Fast transients (e.g. in situ laser ablation)
44 Chromatography with ICPADAMS GC, LC, CE being pursued
45 Lanthanides by LC-ICP-ADAMS
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