ETHOS UP/ETHOS EASY ACCESSORIES LINE MMR-15 MICROWAVE MODULAR ROTOR MILESTONE H E L P I N G C H E M I S T S Milestone ETHOS UP The newly designed ETHOS UP and The US patent 5,447,077 attested ETHOS EASY fully embody Milestone’s the pioneer work of Milestone in the philosophy in microwave sample investigation of the unique heating preparation. mechanism of microwave-assisted They encopasses Milestone’s visionary evaporation process. concept of “Total Microwave Sample The new MMR-15 rotor takes advantage Preparation” and, with a comprehensive of this technology and it is now available choice of accessories, they offer a to chemists to improve the quality of the complete fi rst-class solution also for analytical results and to reduce the overall sample drying, vacuum evaporation, sample preparation time. solvent extraction, protein hydrolisis, and alkaline fusion. “The removal or reduction of the quantity of the hydrochloric and hydrofl uoric acids prior to analysis may be desirable. Evaporation to near drynaess in a controlled environment with controlled pure gas and neutralizing and collection of exhaust interactions is an alternative where appropriate. This manipulation may be performed in the microwave system, if the system is capable of this function…” US EPA method 3052 Extract from US patent 5,447,077 MMR TECHNOLOGY Most US EPA microwave acid digestion The MMR-15 accommodates up to 15 methods (3015, 3051 and 3052) TFM vessels of 100 mL. prescribe the use of combinations They are the same vessels used in the of HNO , HF and HCl. SK-15 digestion rotor, so no transfer 3 HNO is typically required as oxidizing of the solution is required when 3 acid, HF is used for silicates and HCl is performing drying and concentration. recommended for soils and sediments. This minimizes the risk of contamination Solutions obtained by closed vessel Hot-Plate Microwaveor loss of the analytes of interest. 180 digestion must often be evaporated Each vessel fits snugly into an adapter prior analysis either to concentrate 160 which perfectly seals the system. the elements of interest or to eliminate An adjustable valve with in-line filter compounds which may interfer 140 e with the regulates vacuum and air flow. analytical technique being used. 120 All surfaces in contact with the solution A typical setup for micr ture (°C) owave-assisted are made of high-purity TFM. evaporation consists of the ETHOS UP 100 Sample are therefore processed in a or ETHOS EASY equipped with the Tempera clean, inert environment. 80 VAC-1000 vacuum scrubber and the The VAC-1000 integrates a vacuum MMR-15 r 60 otor. pump, a water cooled condenser and a The MMR-15 can be used for vacuum-neutralizing module to properly and safely assisted sample drying prior digestion, 40 handling acid vapors; it is the perfect and solution concentration at the end of 10 5 0 complement to the MMR-15 rotor. the decomposition process. Approximative volume of solution (mL) HCl HNO3 HF 35 30 25 20 15 10 5 Residual volume in each vessel (mL) 0 0 5 10 15 20 25 30 35 40 45 50 Time (minutes) Evaporation time for HCl, HNO and HF 3 MMR CHEMISTRY The paper “Use of Microwave-Assisted Element Microwave evaporation Certified value Evaporation for the Complete Recovery Ag 1.53 ± 0.04 1.68 ± 0.15 of Volatile Species of Inorganic Trace As 13.8 ± 2.2 14.0 ± 1.2 Analysis”, written by Skip Kingston and Cd 4.13 ± 0.24 4.15 ± 0.38 Dirk Link, and published in Analytical Co 0.49 ± 0.02 0.57 ± 0.11 Chemistry some years ago, did compare Cr 1.76 ± 0.03 1.43 ± 0.46 Hg 0.063 ± 0.033 0.0642 ± 0.0067 the heating mechanism of hot plate Mn 11.5 ± 0.5 12.3 ± 1.5 and microwave assisted evaporation. Ni 2.29 ± 1.02 2.25 ± 0.44 It was demonstrated that -when using Pb 0.38 ± 0.07 0.371 ± 0.014 microwave, elements loss by volatilization V 4.59 ± 0.27 4.68 ± 0.15 is minimized, because the temperature of the solution decreases as volume Concentration of analytes (µg/g) in SRM 1566A (Oyster Tissue) following the microwave-assisted decreases during the evaporation evaporation of the digestate compared with the process. Subsequent re-dissolution certified total concentrations (uncertainties are and analysis of the residue by ICP-MS expressed as 95% confidence intervals, with n ≥ 3) showed that a complete recovery was achieved when using microwave-assisted evaporation. Hot-Plate Microwave 180 160 140 120 ture (°C) 100 Tempera 80 60 40 10 5 0 Approximative volume of solution (mL) Temperature of solution as volume decreased during microwave-assisted and hot plate evaporation. The final point in the hot plate temperature profile is that of the beaker bottom at dryness. HCl HNO3 HF 35 30 25 20 15 10 5 Residual volume in each vessel (mL) 0 0 5 10 15 20 25 30 35 40 45 50 Time (minutes) MMR-15 MICROWAVE MODULAR ROTOR Fast sample drying Fast solution concentration No contamination Full volatile recovery US EPA 3052 compliance Full safety From digestion to evaporation HELPING CHEMIST Milestone has been active since 1988 in the field of microwave sample preparation. With over 20000 instruments installed worldwide, we are the acknowledged industry leader in microwave technology. Milestone vision is to help chemists by providing the most technologically advanced instrumentation for research and quality control. Our products offer a wide range of applications, such as microwave acid digestion, solvent extraction, synthesis and ashing. Furthermore we create products for acid purification and direct mercury determination in solid, liquid and gas samples. We offer our customers the highest level of application support, building up over the years a relationship based on trust and commitment. MILESTONE MILESTONE Srl - Via Fatebenefratelli, 1/5 - 24010 Sorisole (BG) - Italy Tel: +39 035 573857 - Fax: +39 035 575498 www.milestonesrl.com - email: analytical@milestonesrl.com MILESTONE INC. - 25 Controls Drive - Shelton, CT 06484 - USA Tel: (203) 925-4240 - Toll-free: (866) 995-5100 - Fax: (203) 925-4241 H E L P I N G www.milestonesci.com - email: mwave@milestonesci.com C H E M I S T S MILESTONE GENERAL K.K. - KSP, 3-2-1, Sakado - Takatsu-Ku, Kawasaki 213-0012 - Japan - Tel: +81 (0)44 850 3811 - Fax: +81 (0)44 819 3036 UNI EN ISO 9001: 2008 CERTIFIED www.milestone-general.com - email: info@milestone-general.com MLS GmbH - Auenweg 37 D-88299 Leutkirch im Allgau - Germany Tel: +49 (0)7561 9818-0 - Fax: +49 (0)7561 9818-12 T362EN-001 www.mls-mikrowellen.de - email: mws@mls-mikrowellen.de CA