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- Application NotesNote 103: EPA Method 325B, Novel Thermal Desorption Instrument Modification to Improve Sensitivity Note 102: Identification of Contaminants in Powdered Beverages by Direct Extraction Thermal Desorption GC/MS Note 101: Identification of Contaminants in Powdered Foods by Direct Extraction Thermal Desorption GC/MS Note 100: Volatile and Semi-Volatile Profile Comparison of Whole Versus Cracked Versus Dry Homogenized Barley Grains by Direct Thermal Extraction Note 99: Volatile and Semi-Volatile Profile Comparison of Whole vs. Dry Homogenized Wheat, Rye and Barley Grains by Direct Thermal Extraction GC/MS Note 98: Flavor and Aroma Profiles of Truffle Oils by Thermal Desorption GC/MS Note 97: Flavor Profiles of Imported and Domestic Beers by Purge & Trap Thermal Desorption GC/MS Note 96: Reducing Warping in Mass Spectrometer Filaments, with SISAlloy® Yttria/Rhenium Filaments Note 95: Detection of Explosives on Clothing Material by Direct and AirSampling Thermal Desorption GC/MS Note 94: Detection of Nepetalactone in the Nepeta Cataria Plant by Thermal Desorption GC/MS Note 93: Detection of Benzene in Carbonated Beverages with Purge & Trap Thermal Desorption GC/MS Note 92: Yttria Coated Mass Spectrometer Filaments Note 91: AutoProbe DEP Probe Tip Temperatures Note 90: An Automated MS Direct Probe for use in an Open Access Environment Note 89: Quantitation of Organics via a Mass Spectrometer Automated Direct Probe Note 88: Analysis of Silicone Contaminants on Electronic Components by Thermal Desorption GC-MS Note 87: Design and Development of an Automated Direct Probe for a Mass Spectrometer Note 86: Simulation of a Unique Cylindrical Quadrupole Mass Analyzer Using SIMION 7.0. Note 85: Replacing an Electron Multiplier in the Agilent (HP) 5973 MSD Note 84: Vacuum Pump Exhaust Filters - Charcoal Exhaust Traps Note 83: Vacuum Pump Exhaust Filters - Oil Mist Eliminators Note 82: Vacuum Pump Exhaust Filters Note 81: Rapid Bacterial Chemotaxonomy By DirectProbe/MSD Note 80: Design, Development and Testing of a Microprocessor ControlledAutomated Short Path Thermal Desorption Apparatus Note 79: Volatile Organic Compounds From Electron Beam Cured and Partially Electron Beam Cured Packaging Using Automated Short Path Thermal Desorption Note 78: A New Solution to Eliminate MS Down-Time With No-Tool-Changing of Analytical GC Columns Note 77: The Determination of Volatile Organic Compounds in VacuumSystem Components Note 76: Determination of the Sensitivity of a CRIMS System Note 75: An Apparatus for Sampling Volatile Organics From LivePlant Material Using Short Path Thermal Desorption Note 74: Examination of Source Design in Electrospray-TOF Using SIMION 3D Note 73: The Analysis of Perfumes and their Effect on Indoor Air Pollution Note 72: 1998 Version of the NIST/EPA/NIH Mass Spectral Library, NIST98 Note 71: Flavor Profile Determination of Rice Samples Using Shor tPath Thermal Desorption GC Methods Note 70: Application of SIMION 6.0 To a Study of the Finkelstein Ion Source: Part II Note 69: Application of SIMION 6.0 To a Study of the Finkelstein Ion Source: Part 1 Note 68: Use of a PC Plug-In UV-Vis Spectrometer To Monitor the Plasma Conditions In GC-CRIMS Note 67: Using Chemical Reaction Interface Mass Spectrometry (CRIMS) To Monitor Bacterial Transport In In Situ Bioremediation Note 66: Probe Tip Design For the Optimization of Direct Insertion Probe Performance Note 65: Determination of Ethylene by Adsorbent Trapping and Thermal Desorption - Gas Chromatography Note 64: Comparison of Various GC/MS Techniques For the Analysis of Black Pepper (Piper Nigrum) Note 63: Determination of Volatile and Semi-Volatile Organics in Printer Toners Using Thermal Desorption GC Techniques Note 62: Analysis of Polymer Samples Using a Direct Insertion Probe and EI Ionization Note 61: Analysis of Sugars Via a New DEP Probe Tip For Use With theDirect Probe On the HP5973 MSD Note 60: Programmable Temperature Ramping of Samples Analyzed ViaDirect Thermal Extraction GC/MS Note 59: Computer Modeling of a TOF Reflectron With Gridless Reflector Using SIMION 3D Note 58: Direct Probe Analysis and Identification of Multicomponent Pharmaceutical Samples via Electron Impact MS Note 57: Aroma Profiles of Lavandula species Note 56: Mass Spec Maintenance & Cleaning Utilizing Micro-Mesh® Abrasive Sheets Note 55: Seasonal Variation in Flower Volatiles Note 54: Identification of Volatile Organic Compounds in Office Products Note 53: SIMION 3D v6.0 Ion Optics Simulation Software Note 52: Computer Modeling of Ion Optics in Time-of-Flight mass Spectrometry Using SIMION 3D Note 51: Development and Characterization of a New Chemical Reaction Interface for the Detection of Nonradioisotopically Labeled Analytes Using Mass Spectrometry (CRIMS) Note 50: The Analysis of Multiple Component Drug Samples Using a Direct Probe Interfaced to the HP 5973 MSD Note 49: Analysis of Cocaine Utilizing a New Direct Insertion Probe on a Hewlett Packard 5973 MSD Note 48: Demonstration of Sensitivity Levels For the Detection of Caffeine Using a New Direct Probe and Inlet for the HP 5973 MSD Note 47: The Application Of SIMION 6.0 To Problems In Time-of-Flight Mass Spectrometry Note 46: Delayed Extraction and Laser Desorption: Time-lag Focusing and Beyond Note 45: Application of SIMION 6.0 to Filament Design for Mass Spectrometer Ionization Sources Note 44: The Design Of a New Direct Probe Inlet For a Mass Spectrometer Note 43: Volatile Organic Composition In Blueberries Note 42: The Influence of Pump Oil Purity on Roughing Pumps Note 41: Hydrocarbon Production in Pine by Direct Thermal Extraction Note 40: Comparison of Septa by Direct Thermal Extraction Note 39: Comparison of Sensitivity Of Headspace GC, Purge and Trap Thermal Desorption and Direct Thermal Extraction Techniques For Volatile Organics Note 38: A New Micro Cryo-Trap For Trapping Of Volatiles At the Front Of a GC Capillary Column Note 37: Volatile Organic Emissions from Automobile Tires Note 36: Identification Of Volatile Organic Compounds In a New Automobile Note 35: Volatile Organics Composition of Cranberries Note 34: Selection Of Thermal Desorption and Cryo-Trap Parameters In the Analysis Of Teas Note 33: Changes in Volatile Organic Composition in Milk Over Time Note 32: Selection and Use of Adsorbent Resins for Purge and Trap Thermal Desorption Applications Note 31: Volatile Organic Composition in Several Cultivars of Peaches Note 30: Comparison Of Cooking Oils By Direct Thermal Extraction and Purge and Trap GC/MS Note 29: Analysis Of Volatile Organics In Oil Base Paints By Automated Headspace Sampling and GC Cryo-Focusing Note 28: Analysis Of Volatile Organics In Latex Paints By Automated Headspace Sampling and GC Cryo-Focusing Note 27: Analysis of Volatile Organics In Soils By Automated Headspace GC Note 26: Volatile Organics Present in Recycled Air Aboard a Commercial Airliner Note 25: Flavor and Aroma in Natural Bee Honey Note 24: Selection of GC Guard Columns For Use With the GC Cryo-Trap Note 23: Frangrance Qualities in Colognes Note 22: Comparison Of Volatile Compounds In Latex Paints Note 21: Detection and Identification Of Volatile and Semi-Volatile Organics In Synthetic Polymers Used In Food and Pharmaceutical Packaging Note 20: Using Direct Thermal Desorption to Assess the Potential Pool of Styrene and 4-Phenylcyclohexene In Latex-Backed Carpets Note 19: A New Programmable Cryo-Cooling/Heating Trap for the Cryo-Focusing of Volatiles and Semi-Volatiles at the Head of GC Capillary Columns Note 18: Determination of Volatile Organic Compounds In Mushrooms Note 17: Identification of Volatile Organics in Wines Over Time Note 16: Analysis of Indoor Air and Sources of Indoor Air Contamination by Thermal Desorption Note 14: Identification of Volatiles and Semi-Volatiles In Carbonated Colas Note 13: Identification and Quantification of Semi-Volatiles In Soil Using Direct Thermal Desorption Note 12: Identification of the Volatile and Semi-Volatile Organics In Chewing Gums By Direct Thermal Desorption Note 11: Flavor/Fragrance Profiles of Instant and Ground Coffees By Short Path Thermal Desorption Note 10: Quantification of Naphthalene In a Contaminated Pharmaceutical Product By Short Path Thermal Desorption Note 9: Methodologies For the Quantification Of Purge and Trap Thermal Desorption and Direct Thermal Desorption Analyses Note 8: Detection of Volatile Organic Compounds In Liquids Utilizing the Short Path Thermal Desorption System Note 7: Chemical Residue Analysis of Pharmaceuticals Using The Short Path Thermal Desorption System Note 6: Direct Thermal Analysis of Plastic Food Wraps Using the Short Path Thermal Desorption System Note 5: Direct Thermal Analysis Using the Short Path Thermal Desorption System Note 4: Direct Analysis of Spices and Coffee Note 3: Indoor Air Pollution Note 2: Detection of Arson Accelerants Using Dynamic Headspace with Tenax® Cartridges Thermal Desorption and Cryofocusing Note 1: Determination of Off-Odors and Other Volatile Organics In Food Packaging Films By Direct Thermal Analysis-GC-MS Tech No. "A" Note 14: Elimination of "Memory" Peaks in Thermal Desorption Improving Sensitivity in the H.P. 5971 MSD and Other Mass Spectrometers - Part I of II Improving Sensitivity in the H.P. 5971 MSD and Other Mass Spectrometers- Part II of II Adsorbent Resins Guide Development and Field Tests of an Automated Pyrolysis Insert for Gas Chromatography. Hydrocarbon Production in Pine by Direct Thermal Extraction A New Micro Cryo-Trap for the Trapping of Volatiles at the Front of a GC Capillary (019P) - Comparison of Septa by Direct Thermal Extraction Volatile Organic Composition in Blueberry Identification of Volatile Organic Compounds in Office Products Detection and Indentification of Volatiles in Oil Base Paintsby Headspace GC with On Column Cryo-Trapping Evaluation of Septa Using a Direct Thermal Extraction Technique INFLUENCE OF STORAGE ON BLUEBERRY VOLATILES Selection of Thermal Desorption and Cryo-Trap Parameters in the Analysis of Teas Redesign and Performance of a Diffusion Based Solvent Removal Interface for LC/MS The Design of a New Direct Probe Inlet for a Mass Spectrometer Analytes Using Mass Spectrometry (CRIMS) Application of SIMION 6.0 to Filament Design for Mass Spectrometer Ionization Sources A Student Guide for SIMION Modeling Software Application of SIMION 6.0 to Problems in Time-of-flight Mass Spectrometry Comparison of Sensitivity of Headspace GC, Purge and TrapThermal Desorption and Direct Thermal Extraction Techniques forVolatile Organics The Influence of Pump Oil Purity on Roughing Pumps Analysis of Motor Oils Using Thermal Desorption-Gas Chromatography-Mass Spectrometry IDENTIFICATION OF VOLATILE ORGANIC COMPOUNDS IN PAPER PRODUCTS Computer Modeling of Ion Optics in Time-of-Flight mass Spectrometry using SIMION 3D Seasonal Variation in Flower Volatiles Development of and Automated Microprocessor Controlled Gas chromatograph Fraction Collector / Olfactometer Delayed Extraction and Laser Desorption: Time-lag Focusing and Beyond A New Micro Cryo-Trap for the Trapping of Volatiles at the Front of a GC Column Design of a Microprocessor Controlled Short Path Thermal Desorption Autosampler Computer Modeling of Ion Optics in Time-of-Flight Mass Spectrometry Using SIMION 3D Thermal Desorption Instrumentation for Characterization of Odors and Flavors
- Lab/CleanMicro-Mesh® (Fine Cushioned Abrasive) Aluminum Oxide Cleaning Abrasive Fiberglass Cleaning Brushes Swabs and Applicators Nylon and Latex Gloves Cleaning Wipes SIS MS Source Cleaning Kits Dust-Off® Hurricane Canless Air System Wheaton Bottles Wheaton Vials Wheaton Closures Sterile Vials - Bottle, Stopper, and Cap - All Together Certified Sterile Kimble Chase Clear Serum Vials Soil Sampling Kits Crimpers and Decappers Temperature Measurement & Recording Devices Bullet Blender® Homogenizer The SW 110 Multi-Purpose Spot Welder New Era Syringe Pump Systems KD Scientific Syringe Pump Systems Ohaus MB Series Moisture Analyzers Celestron® Handheld Digital Microscope (HDM) Checkit® Pipette Accuracy Test Greenwood Lab Supplies Next Advance Lab Products Catalog Page G1
- MSAgilent Bruker Extrel JEOL Kratos Perkin Elmer SCIEX Shimadzu Thermo Varian Waters (Micromass/VG) FLIR/Griffin Inficon/Leybold/Balzers MKS/UTI Hiden Dupont/CEC Nermag Vestec Filaments Heaters/Sensors Wire Material Electron Multipliers Probe/Sample Vials Ion Transfer Tubes Calibration Compounds MALDI-TOF Supplies Ceramic Insulators Cleaning Supplies Other Filament Repair Source Cleaning Transfer Line Repair GC Injection Port Repair Vacuum Feedthru Repair Other Repair Services NIST MS Library Wiley MS Libraries SIMION® 8.1 Catalog Page A1 Catalog Page B1
- Note 56: Mass Spec Maintenance & Cleaning Utilizing Micro-Mesh® Abrasive Sheets (This Page)
By John J. Manura
We have had many requests over the years for a fine grit sandpaper to clean quadrupole rods and other mass spectrometer source parts. Most commercially available sandpapers or emery papers were too coarse or degraded too rapidly. We had several reports of some mass spec servicemen using a fine abrasive product to clean quadrupole rods, so we set out to find a source of a fine abrasive cloth for various uses in cleaning mass spectrometer parts, in particular for cleaning quadrupole rods, source slits and other source parts. The product we eventually decided to market is known as Micro Mesh Cushioned Abrasives.
Table 1 - Micromesh Abrasives
|MM-1500||4" 6" sheet, 1500 Grit||Violet|
|MM-1800||4"x 6" sheet, 1800 Grit||Pink|
|MM-2400||4"x 6" sheet, 2400 Grit||Grey|
|MM-3200||4"x 6" sheet, 3200 Grit||Blue|
|MM-3600||4"x 6" sheet, 3600 Grit||Green|
|MM-4000||4"x 6" sheet, 4000 Grit||Yellow|
|MM-6000||4"x 6" sheet, 6000 Grit||Orange|
|MM-8000||4x 6 sheet, 8000 Grit||Red|
|MM-12000||4x 6 sheet, 12000 Grit||Green|
Micro Mesh not like conventional abrasive sheets or sandpaper. In the case of Micro Mesh products, there is a cloth backing upon which a thin latex film is applied. The various sizes of aluminum oxide crystals are adhered onto the film in such a manner that the crystals are held in a resilient matrix, as opposed to a hard matrix. This construction allows the crystals to remain adhered to the backing even when used under pressure. What is unique about the cushioned abrasives is that they do not produce any random deep scratches. Instead, they produce an extremely uniform scratch pattern over the entire work surface. The cushioned Micro Mesh abrasives also have an extremely long life, since the crystals will continue to cut effectively until they eventually become dull and lose their sharp cutting edges. This product line was initially developed to remove scratches and to polish the acrylic windows on aircraft, but additional applications have included polishing all metals, plastics, PTFE, Vespel® and many other natural and synthetic materials. The normal procedure involves the use of a range of abrasive sheets. By beginning with the coarser grits and successively using finer grits, mirror finishes can be obtained.
Figure 1 - Micromesh can be used to clean mass spec probe rods.
The starting grit size is determined by how deep the scratches or imperfections are in the item you are cleaning. On cleaning items, as mass spectrometer direct probes (Fig. 1), it may be necessary to begin with the coarsest grits of abrasive to remove the deep scratches. Once you begin cleaning with a specific mesh size, you must continue the cleaning process with the next finest mesh size. It is important that none of the intermediate mesh sizes are skipped. Each successive grit size must be used in mesh size order to remove the scratches from the previous mesh size. By using the successive mesh sizes all the way down to the 12,000 mesh size, a mirror finish can be obtained (Fig. 2). This finish is finer than the finish which could be obtained even with buffing wheels and without the mess. The Micro-Mesh abrasives can be used either wet or dry, depending on your preference. Most users prefer to use the sheets dry without any water or other lubricant. Individual sheets can be washed out and used again. The Micro-Mesh products may cost more than ordinary sandpaper, but it produces finishes ten times finer and lasts 10 to 20 times longer. Every sheet is color coded (see Table 1) for easy reference and has the grit size written on the reverse side. Grit sizes range from 1500 grit to 12,000 grit. The higher the grit number, the finer the cutting action. The finer meshes are ideal for cleaning and polishing source slits and quadrupole rods.
Figure 2 - Micromesh can be used to clean mass spec metal filaments.
Figure 3 - Cleaning Source Slit With Micromesh
Other uses of the Micro-Mesh abrasives include the cleaning of source slits (Fig. 3) which cannot be cleaned by other materials since they would round the slit edges or remove too much metal. Cleaning quadrupole rods and other source parts is easily accomplished with minimal surface metal removal. SEM sources can also be cleaned in a similar manner. A related product is the Micro-Mesh polishing board (Fig. 4). This emory board sized polisher contains three of the finer grits and is ideal for reaching into tight spots, and for general instrument part cleaning where an abrasive sheet with a stiff backing is preferable. The Micro-Mesh boards are used just like the Micro-Mesh sheets, starting with the coarsest area and working toward the finest area. In our shop we use these boards for cleaning the electrodes on our spotwelders and also for cleaning filament posts. These boards are also useful for cleaning quadrupole rods. The Micro- Mesh polishing board has three different polishing surfaces on its two sides. On the side with the two sections, the dark granular gray, section is the coarsest grit and should always be used first until as many as possible of the visible scratches have been removed. The neighboring white section is the next finest grit and should be used next. This section will further smooth the rough edges and scratches caused by the first grit. Finish polishing with the opposite side of the polishing board. This side is medium gray and is the finest abrasive. This should remove the finest scratches. If not, it may be necessary to back-track to the coarser grits and repeat the operations. Remember that the polishing board is primarily for tight areas and corners and cannot be expected to do as complete a job as the Micro-Mesh sheets. It can however, do a fine job in places that are hard to reach.
Figure 4 - Micromesh Polishing Boards
Directions For Using Micro-Mesh Abrasives
1 . Wipe off the object to be cleaned with a rag or cloth. Any loose, hard material left on the subject could possibly cause deep scratches which may prove difficult to remove.
2. Begin with the lowest number grit required to remove the scratches. (begin with the 1500 grit if the surface is fairly rough). Polish in straight lines completely covering the area to be polished. Further polishing with subsequent grit sizes should be done at right angles to the previous grit until the scratches and imperfections are no longer clearly visible. If the scratches or imperfections are very deep, it will probably be necessary to first sand the area with conventional 200 grit emery paper to prepare the surface for subsequent cleaning with the Micro-Mesh Abrasives.
3. After two to three minutes of polishing with the Micro-Mesh cloth, begin using the next highest grit number (next finest grit) of Micro-Mesh abrasive cloth and repeat the procedure in step 2. Remember to always work at right angles to the direction of polishing with the previous abrasive grit size.
4. Wipe off the object to be cleaned with a rag or cloth between abrasive grits to remove any loose, hard material left on the object.
5. Continue working with successively finer grits until the finish you desire is attained. Continuing all the way to the 12,000 grit sheet will produce a bright mirror finish on most smooth metals. A bright, shining surface can sometimes be achieved quicker depending on the metal and the initial condition of the surface. For additional information on the availability of the Micro-Mesh products, please refer to Scientific Instrument Services complete catalog.
For additional information on Micro Mesh including availability, visit our WEB pages on Micromesh or see our catalog.