Search for: search Customer Login | Contact TECHNOLOGY GEOCHEMICAL ENVIRONMENTAL QUALITY CLIENT TOOLS ABOUT US Fire Assay (FAPB) Note: We do have a $500 minimum on orders. receipt PRICING create SAMPLE SUBMITTAL For Time Critical Projects Penalty based Written Guarantees can be contracted. Contact us for specialized laboratory services, onsite laboratories or contract negotiation. Accounts delinquent for 60 days will have in house work halted until brought current. Please feel free to contact us with any questions on our packages or pricing and will be happy to provide you with the information you need. contact_support CONTACT Method FUSION The sample is fused in a ceramic crucible with litharge, sodium carbonate, borax and flour at 1080ºC. CUPELLATION The 25-50 gram lead button is cupelled in a magnesite cupel at 900ºC for 60 minutes. DIGESTION The silver bead is parted with concentrated nitric acid. Hydrochloric acid is then added to generate chlorine and nitrosoyl chloride that dissolves the PGM sponge. ANALYSIS Gold, Palladium and Platinum may be determined by this technique. Digested samples are read on an ICP-AES. Parted prills can be weighed and reported as gold. LIMITATIONS ICP readings typically have a +/- 3-5% variation. Gravimetric determinations for gold and silver are less accurate at low levels (< 3 ppm) but more acurate (< 1% variation) above 3ppm than ICP. Gravimetric reported gold results include any palladium, platinum and retained silver. DETECTION LIMIT: ICP, GRAVIMETRIC METHOD FA-Pb30 FA-GRAV ICP-2AAg DIGEST FA-Pb30 FA-Pb30 D2A WEIGHT 30g 30g 0.5g FINISH ICP-OES Gravimetric ICP-OES UNITS ppm ppm ppm RANGE LDL-UDL LDL-UDL LDL-UDL Au Gold 0.003-10 0.05-1,000,000 X Ag Silver X 7-1,000,000 0.2-100 Pd Palladium 0.003-10 X X Pt Platinum 0.005-10 X X Overrange result will trigger a Gravimetric Fire Assay repeat Results can be reported in client requested units Key Technologies Atomic Emission (ICP-AES) Mass Spectrometry (ICP-MS) X-Ray Fluorescence (XRF) X-Ray Diffraction (XRD) Carbon/Sulfur Analysis Direct Mercury Analysis Popular Services Fire Assay ICP Analysis Scanning Electron Microscope More Information Lab History Lab Feedback Lab Careers Privacy Policy Terms & Conditions Copyright 1991-2021 American Assay Labs - All rights reserved.