New DIC Analyzer with a Multi-Sampler

Model AS-C5

The Apollo SciTech’s new AS-C5 DIC Analyzer has been developed and tested for total dissolved inorganic carbon analysis in a variety of aquatic environments. Advantages of this DIC analyzer include the use of small sample volumes (0.1-1.5 mL) with a fast analytical rate (~3 minutes per analysis). Further, the system maintains a precision of ± 0.1% or better.

The AS-C5 DIC analyzer is comprised of a solid state infrared CO2 detector (LI-850, Li-Cor, USA), a digital syringe pump for precise delivery of reagent and sample solutions (KLOEHN, USA), a mass flow controller to accurately regulate the carrier gas flow rate, a specifically designed CO2 stripping reactor that allows for an efficient and smooth stripping of CO2 from the water sample, an electronic cooling system for removing moisture, and a computer communication assembly (USB to RS232 converter with a data acquisition unit).

Our earlier model (AS-C3) has been used with high satisfaction by the community since 2000. While our innovative design principle remains the same, the AS-C5 has several improvements:

  1. A more efficient CO2 stripping reactor is implemented.
  2. A multi-sampler of one set of standards, and 8 samples are used.
  3. A better computer software with an optimized procedure is developed.
  4. A lower cost LI-850 is used with comparable precision with the AS-C3.
    (A LI-7000 CO2 analyzer-based unit is also available.)


  • Power Supply: Universal (100-240 V)
  • Carrier Gas: N2 ~16 psi (1 atm)
  • Precision: ±2 µmol/kg
  • Sample Volume: 0.1-1.5 mL per analysis
  • Time: ~3 minutes per analysis
  • Communication: RS 232, USB
  • Environment: Shipboard or land-based laboratory