Environmental geochemistry

Lab # 1235

The environmental geochemistry lab provides a range of analytical instruments for the detection of carbon and inorganic elements in water and soil samples.

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Perkin Elmer ICP-OES Optima 8300

This instrument allows for simultaneous elemental analysis (up to 20 elements). Measurements are made by introduction of an aqueous sample into a high-temperature (8000°C) argon plasma. The instrument is equipped with an auto-sampler that can accommodate 100 samples. About 3 minutes are required to analyze each sample. A minimum sample volume of 3 - 5 ml is needed. The detection limit is around 0.5 µM, but depends on the element(s) being analyzed and the sample matrix. The instrument gives a linear response over 3 - 4 orders of magnitude in concentration. Samples MUST be filtered to remove all particles and acidified prior to analysis. Samples must be diluted to have a total dissolved solids concentration of < 1 % TDS (Meinhard nebulizer) or < 10% (PEEK Mira Mist nebulizer).

Additional information in the pdf below

Contacts: Laetitia.Monbaron@unil.chJasquelin.Pena@unil.ch

 

Hou&Jones_2000.pdf  (154 Ko)

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Ion chromatography

The Metrohm ion chromatography measures major anions and cations present in water samples: F-, Cl-, NO2-, Br-, NO3-, SO42-, PO43-, Li+, Na+, NH4+, K+, Mg2+ and Ca2+. Samples are injected into an ion-exchange column that separates the ions according to their retention times. A conductivity meter detects the concentrations of ions eluted from the column. The instrument is equipped with an auto-sampler that can accommodate 150 samples. About 30-35 minutes are required to analyze each sample. A minimum sample volume of 20ml is needed; the detection limit is approximately 0.1 mg L-1; the instrument gives a linear response over a range of 0.1 – 500 ppm. Samples must also be diluted to a total conductivity of 500 µS. Water samples MUST be filtered to remove particulate matter and organic matter. Samples for cation analysis can be acidified to prevent algal growth, the formation of precipitates or adsorption of ions to the walls of the storage bottles.

IonChromotography.png

Contacts: Laetitia.Monbaron@unil.chJasquelin.Pena@unil.ch

Jackson_2000.pdf  (237 Ko)

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LiquiTOC

The TOC-L Shimadzu measures the concentrations of total carbon (TC), total inorganic carbon (TIC), total organic carbon (TOC) and non-particulate organic carbon (NPOC) in aqueous samples. Measurements are made by high temperature oxidation of the carbon (750°C) and detection of CO2 by an NDIR photometer. Total bound nitrogen (TNb) can also be measured. The instrument is equipped with an auto-sampler that can accommodate 44 samples. About 20 minutes are required to analyze each sample. A minimum sample volume of 20 ml is needed; the detection limit is approximately 0.5 ppm; the instrument gives a linear response over a range of 0 – 100 ppm. Samples must fall within this concentration range or be diluted accordingly by the user.

Additional information in the pdf below

ContactsLaetitia.Monbaron@unil.chJasquelin.Pena@unil.ch

LiquiTOC.png

 

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Shimadzu UV-vis spectrophotometer UV-2600

This device measures the absorption or transmission of samples at wavelengths of 185 – 900 nm. It can be used for the quantitation of metals by colorimetric methods (e.g., Fe(II) analyzed by the ferrozine assay or Mn(III, IV) analyzed by the leucoberbelin blue assay), the detection of organic molecules (e.g., siderophores), and the measurement of turbidity (e.g., to determine bacterial growth rates or particle settling times). The instrument has linear response until 1 absorbance units. Standard-sized (5 mL) and micro-sized (1 mL) quartz cuvettes with 1 cm path length are available; the instrument can also be used with disposable plastic cuvettes.

ContactsLaetitia.Monbaron@unil.chJasquelin.Pena@unil.ch

 

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CH-1015 Lausanne
Switzerland
Tel. +41 21 692 44 00