Combustion IC: The combination of a combustion and an Ion Chromatograph. In a fully automated process the samples are thermally digested under argon in the furnace unit and then combusted with oxygen. The resulting gaseous compounds are passed into an absorption solution, which is then transferred inline to a Metrohm ion chromatography system. Typically halogens and sulfur are analyzed.

Diode Array Detector: Each wavelength of the UV and visible range of the light is measured with an individual diode. The optical resolution of the detector is defined by the number of diodes used (e.g. 844 UV/VIS Compact IC: optical resolution = 1.4 nm).

Digital Signal Processing: Advanced digital measuring of the conductivity with a high resolution detector. Allowing the direct measurement of all conductivities in one single measuring range from 0 µS/cm up to 15'000 µS/cm without "Range/Full Scale" changes nor "Autoranging". The electronic resolution is 0.0047 nS/cm. All intelligent IC instruments are equipped with DSP.

Eluent Preparation On Demand: Automatic preparation of eluents for uninterrupted IC analyses for several weeks. Dosinofficiency of a stationary phase. It is the length of the respective column (L) divided by the number of theoretical plates (N). The smaller the value for HETP, the better is the efficiency.

Ion chromatography combined with Mass Spectrometry with inductively coupled plasma (IC-ICP/MS). Typical analyses: Speciation of, e.g., chromium, selenium, arsenic compounds.

Ion chromatography combined with mass spectrometric detection (IC-MS). Allows often the direct identification of unknown components. Typical application: Very low level analysis, improved selectivity.

Ion Exclusion Chromatography: Separation of ions (mainly weak acids) and neutral components (e.g., alcohols) on an ion exchanger material. In IEC, a completely sulfonated cation exchanger, whose sulfonic acids groups are electrically neutral with protons as counter-ions, is frequently used as packing material. In aqueous eluents, the functional groups are hydrated. The hydrate shell is limited by a partially negatively charged membrane (Donnan membrane). It is only passable by uncharged, non-dissociated molecules such as water. Organic carboxylic acids can be separated if strong mineral acids such as sulfuric acid are used as the mobile phase. Due to their low acid constants (pKs values) the carboxylic acids are almost completely present in a non-dissociated form in strongly acidic eluents. They can pass through the Donnan membrane and be adsorbed at the stationary phase, whereas the sulfate ions of the completely dissociated sulfuric acid are excluded. May be used without chemical suppression and with inverse chemical suppression. Column: Metrosep Organic Acids

Limit of Detection: The concentration of the analyte at which the resulting peak can still be distinguished from baseline noise. Literature and norms describe different ways of determination of the LOD. MagIC Net can determine the LODs automatically.

Limit of Quantification: The minimum concentration of the analyte at which the resulting peak can be quantified with a defined security level. Typically 3 to 5 times higher than LOD.

Monitor for AeRosols & GAses in Ambient Air: Dedicated instrument for the analysis of anions and cations in ambient air and aerosols. MARGA continuously samples aerosols as well as acidic and basic gases in air. Anions and cations are analyzed by two built-in Compact ICs. System for semi-continuous analysis for unattended work. For aerosol sampling only see PILS.

Metrohm CO2 Suppressor: Removes dissolved CO2 after chemical suppression of carbonate / bicarbonate eluents. The dissolved carbonic acid partially dissociates to bicarbonate. This leads to a slightly higher background conductivity of the eluent. With the MCS, this background conductivity is minimized to very low levels comparable to those from hydroxide eluents. This minimizes the water dip as well as the system peak. Typical background conductivity after MCS is < 1 µS/cm. With hydroxide eluents the MCS removes the background conductivity from carbonate traces.

Metrohm Inline Dilution Technique: It allows to automatically dilute the sample according to a set dilution factor. Liquid handling is performed with a Dosino. Works with MagIC Net. Applying ProfIC 4 system.

Metrohm intelligent PreConcentration Technique: Dosinobased variable preconcentration technique for extremely flexible calibration out of one standard solution and high calibration range. Applying ProfIC 5 system

Same as MiPCT but with additional Matrix Elimination. Applying ProfIC 5 plus an additional Dosino.

Metrohm intelligent Partial Loop Technique: Partial loop injection technique making use of Dosino liquid handling. Multi-point-calibration out of one standard solution, sample volume adjustment. Sample concentration range 1:10,000 in ppb/ppm concentrations. Applying ProfIC 15 system

Metrohm intelligent Pick-up Technique: Allows to inject 1 to 60 µL of a small volume sample. Required sample volume: only the volume to be injected. Partial loop injection technique making use of Dosino liquid handling. Multi-point-calibration out of one standard solution, sample volume adjustment.

Metrohm Inline Sample Preparation: Consists of all automated inline sample preparation techniques used with Metrohm IC systems. Examples: Inline Ultrafiltration, Inline Dialysis, Inline Dilution, Inline Neutralization, etc.

Metrohm Suppressor Module: Packed bed suppressor with 3 identical suppressor compartments packed with a cation exchanger material. Allowing uninterrupted analysis with chemical suppression due to off-line regeneration and rinsing of the used compartments. Suppressor with the lowest apparent baseline noise and therefore the lowest detection limits. Pressure and solvent compatible. Due to its stability, Metrohm offers a 10 year warranty on the MSM.

Metrohm Suppressor Module – High Capacity: Same as MSM but with four times higher exchange capacity. Allows the use of higher concentrated eluents and stronger gradients.

Metrohm Suppressor Module – Low Capacity: Same as MSM but with lower exchange capacity. Used for 2 mm columns.

Pulsed Amperometric Detection: Electrochemical detection applying different potentials (pulses) to the working electrode. All components which are oxidized or reduced at the electrode can be analyzed. Also those which react with the surface or cover it. To remove such disturbing reaction products, highly oxidative and reductive potentials are applied to the working electrode after the measuring potential. This removes the reaction products from the previous measuring cycle and renews the electrode surface. Typical applications: carbohydrates, amino acids.

Post-Column Reaction: After the analytical column an ion is converted into a component with better detectability (e.g., UV/VIS absorption) by adding of a reagent. This product is then detected with UV/VIS detection. The reaction of the analyte and the reagent is usually very selective and yields often in a colored product (for VIS detection), e.g., chromate + diphenylcarbazide react to form a complex (540 nm); bromate + iodide react to form triiodide (352 nm). Parameters that will influence the sensitivity are the reaction time (flow rate, length of reaction coil), the reaction temperature, pH, concentration of catalysts.

Particle Into Liquid Sampler: Aerosol sampler to be connected to IC or other analysis techniques. Allows the semi-continuous analysis of the chemical (ionic) composition of aerosols (particulate matter). Acidic and basic gases have to be removed by denuders prior to the PILS. For the analysis of gases and aerosol see MARGA

UV/VIS detection: The absorption of light is the measuring signal in the chromatogram. There are four different ways of applying UV/VIS detection in IC: direct UV/VIS, indirect UV/VIS, UV/VIS after post-column reaction and UV/VIS after pre-column reaction.