ICP Atomic Emission Spectrometer

The Thermo Scientific iCAP 7400 DUO has both radial and axial plasma viewing capibilities and is equipped with a Teledyne ASX-560 240 position autosampler. It is driven by Thermo Scientific Qtegra software which operates on a Windows7 system. The charge injection device (CID86) detector allows free choice of wavelengths over the 166-847nm range.

Perkin Elmer Graphite Furnace Atomic Absorption Spectrometer

The AA spectrometer in MacMillan Hall is a Perkin Elmer AAnalyst 600, which uses a THGA Graphite furnace as a heat source. The temperature is controlled so that the sample is dried, ashed, and atomized, after which the atomic vapor fills a tube, through which light is passed. Some of this light is absorbed, and identification and concentrations of the sample is determined from the absorption spectrum. This spectrometer is useful for measuring trace levels of metals in water and digests of soil, plant, and organic materials.

More information (Brown login required): GFAAS Protocol

Dionex DX500 Liquid Chromatography System

The Dionex DX500 modular ion chromatography system is equipped for both anion and cation analysis. The primary column set is for the analysis of anions (fluoride, chloride, nitrite, nitrate, phosphate, and sulfate). The modular system includes an AS40 autosampler, a GP50 gradient pump, and a CD20 conductivity detector for rapid analysis of ions in marine and freshwater samples. PeakNet 6.0 software is used for instrument control, sample analysis, data processing, reporting, and documentation.

Carbon-Nitrogen Elemental Analyzer

The CE Instruments Model NC2100 elemental analyzer is used to measure carbon and nitrogen content of samples. Our system consists of a base unit, an AS12 Autoloader, and two 32-position carousels. Samples are converted to gas via dynamic flash combustion, moved through oxidation-reduction reactors and an H2O absorptive trap, swept through a GC column where they are separated and subsequently detected by a thermal conductivity detector. Depending on how the sample is prepared, the analyzer is routinely used to determine the organic carbon, total carbon, and nitrogen content of soils, sediment, and plant material.

DMA-80 Direct Mercury Analyzer

The Milestone mercury analyzer determines mercury content of solid and liquid samples. Samples are placed in quartz or nickel boats and inserted into the analyzer’s 40-position autosampler. Each sample is then dried and combusted, and the products of combustion are further decomposed using a hot catalyst. A gold amalgamator is used to trap mercury vapors, after which the system is flushed with oxygen to remove any excess gases. The amalgamator is then rapidly heated to release the mercury vapors, which pass through the light path of the built-in Atomic Absorption Spectrophotometer at a 254 nm wavelength. The control terminal allows manual or automatic operation of the instrument, and it can import results of analysis into a spreadsheet. The detection range is 0 to 1,000 ng of mercury.

Milestone UltraWave SRC Microwave Digestion system

MacMillan Hall houses a Milestone Ultrawave Single Reaction Chamber (SRC) Microwave Digestion System. The Ultrawave is used to prepare samples for elemental analysis on GFAAS, ICP-AES, or ICP-MS instruments. The system can handle up to 15 glass or TFM vials and can accommodate different sample types and acid mixtures in a single run. The system operates up to 199 bar pressure and 300°C. EasyControl software is used to operate the instrument and monitor the temperature and pressure of the chamber during the run.

More information (Brown login required): Organic Matter Digestion using Ultrawave

Freeze Dryer

MacMillan Hall houses two LABCONCO FreeZone 6 Liter Freeze Dry Systems for removing water and other solvents from frozen samples by sublimation.

Olympus Handheld XRF – Aphha and Delta models

The Olympus Alpha 4000 and Delta Professional Handheld XRF identify and measure the chemical composition of a given sample. The instrument is applied to the surface of the sample, where upon trigger, a beam of X-rays excites electrons in the atoms of the sample. The spectrum obtained from these excited electrons reveals both the elemental content of the sample, as well as the concentration of each element identified within the sample. The advantage of the handheld XRF is that it is portable and quicker, which allows for greater flexibility in analyzing samples. The Delta model can be mounted to the GeoTek multisensor core scanning track to obtain the chemical composition of core sections. The Alpha model is primarily used for the rapid analysis of lead (Pb) in soils and sediments.

More information (Brown login required):Innov-X Handheld XRF Protocol

UIC, INC Inorganic Carbon Analyzer

The UIC, Inc. CM240 TIC Analyzer is capable of measuring total inorganic carbon in a wide variety of sample matrices. It combines the CM5240 automated sample acidification sample introduction system with the CM5014 Coulometer. Solid samples ranging from low ppm to 100% inorganic carbon can be analyzed with this system.

More information (Brown login required): Coulometer Instructions

Picarro L1102-I Isotopic Water Liquid Analyzer

The Picarro L1102-i Isotopic Water Liquid Analyzer measures delta D/H and delta 18O/16O in liquid water using Wavelength-Scanned Cavity Ringdown Spectroscopy (WS-CRDS) to scan the absorption lines unique to H216O, H218O, and HD16O, providing 18O and D in one rapid measurement. This entails the time based measurement of tunable laser light, the decay of which (during ring down) depends on the absolute concentration of the various isotopes. The measurements are precise and accurate, comparable to, or better than isotope ratio mass spectrometry. Small sample size, rapid analyses and the ability to measure samples with a large range of salinities (from fresh to full ocean water) add to the utility of the analyzer. ChemCorrect (Picarro) software enables the determination of type and magnitude of potential organic contaminants. Up to 90 samples can be measured in one analytical run, over two days time.