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Instruments > In Situ/Laboratory Instruments > Chemical Meters/Analyzers > OC-EC Analyzer

Preferred term

OC-EC Analyzer  

Definition

  • Sunset Laboratory’s Semi-Continuous OCEC instrument has been developed as a field deployable alternative to integrated filter collection with subsequent laboratory analysis. This instrument can provide time-resolved OCEC analyses on a semi-continuous basis with OCEC (organic and elemental carbon) results comparable to the recognized NIOSH Method 5040. As currently performed, a quartz filter punch is mounted in the instrument, then samples are collected for the desired time period. Once the collection is complete, the oven is purged with helium, a stepped-temperature ramp increases the oven temperature to 850 °C, thermally desorbing organic compounds and pyrolysis products into a manganese dioxide (MnO2) oxidizing oven. As the carbon fragments flow through the MnO2 oven, they are quantitatively converted to CO2 gas. The CO2 is swept out of the oxidizing oven with the helium stream and measured directly by a self-contained non-dispersive infrared (NDIR) detector system. A second temperature ramp is then initiated in an oxidizing gas stream and any elemental carbon is oxidized off the filter and into the oxidizing oven and NDIR. The elemental carbon is then detected in the same manner as the organic carbon. (en)

Broader concept

Change note

  • 2020-04-14 15:07:03.0 [tstevens] Insert Concept add broader relation (OC-EC Analyzer [ea17edb6-5c2d-4f17-bcf0-702fd2932024,559941] - Chemical Meters/Analyzers [3d25724b-832f-4a61-b0b2-4f2ccecdba94,543779]);
  • 2020-04-14 15:08:24.0 [tstevens] insert AltLabel (id: null category: primary text: Organic Carbon and Elemental Carbon Analyzer language code: en); insert Definition (id: null text: Sunset Laboratory’s Semi-Continuous OCEC instrument has been developed as a field deployable alternative to integrated filter collection with subsequent laboratory analysis. This instrument can provide time-resolved OCEC analyses on a semi-continuous basis with OCEC (organic and elemental carbon) results comparable to the recognized NIOSH Method 5040. As currently performed, a quartz filter punch is mounted in the instrument, then samples are collected for the desired time period. Once the collection is complete, the oven is purged with helium, a stepped-temperature ramp increases the oven temperature to 850 °C, thermally desorbing organic compounds and pyrolysis products into a manganese dioxide (MnO2) oxidizing oven. As the carbon fragments flow through the MnO2 oven, they are quantitatively converted to CO2 gas. The CO2 is swept out of the oxidizing oven with the helium stream and measured directly by a self-contained non-dispersive infrared (NDIR) detector system. A second temperature ramp is then initiated in an oxidizing gas stream and any elemental carbon is oxidized off the filter and into the oxidizing oven and NDIR. The elemental carbon is then detected in the same manner as the organic carbon. language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/ea17edb6-5c2d-4f17-bcf0-702fd2932024

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