Iso TOC Cube

Fully integrated TOC/TNb isotope ratio analysis


Stable isotope analysis helps to understand the processes that control the carbon and nitrogen cycling in aquatic systems. The quantitative and isotopic analysis of dissolved matter (e.g. dissolved total organic carbon, total bound nitrogen, etc.) is of particular importance since this pool is a prime conduit in the cycling of nitrogen and carbon. The iso TOC cube elemental analyzer inlet presents a new high-temperature combustion method for the quantitative and isotopic analysis of dissolved total organic carbon (TOC) and dissolved total bound nitrogen (TNb). It is the only instrument capable of performing these analyses, making it an indispensable tool for ecologists, limnologists, and oceanographers.


Highlights of the iso TOC cube

Direct δ13C isotope analysis of TOC in aqueous samples

with the possibility of column preconcentration for low TOC samples

Direct δ15N isotope analysis of TNb in aqueous samples

with the only commercially available instrument capable of this kind of analysis

High sample throughput

thanks to a direct analysis method which does not require sample preparation

High system uptime

thanks to low-maintenance design



Direct δ13C isotope analysis of TOC in aqueous samples

The iso TOC cube is a combustion analyzer with greater analytical robustness and less maintenance than analyzers working with wet-chemical or UV oxidation methods. Even when analyzing refractory organic substances such as humic acids or lignin, which are traditionally difficult to combust, you can expect reliable, matrix-independent measurement results thanks to the complete conversion of all compounds at these high combustion temperatures. Thus, the iso TOC cube enables dissolved carbon and nitrogen isotope ratio analysis with highest precision and accuracy in all types of liquids, from drinking water or industrial wastewater up to soil leachates, suspensions, brines, or marine samples. For low TOC samples the iso TOC can be configured with an optional column, which preconcentrates TOC.

The one and only analyzer for direct δ15N isotope analysis of TNb in aqueous samples

The iso TOC cube elemental analyzer for EA-IRMS is the only commercially available instrument capable of simultaneous isotope ratio analysis of dissolved total organic carbon (TOC) and dissolved total bound nitrogen (TNb) in aqueous samples. For the δ15N analysis of TNb, the iso TOC cube uses our unique Low Concentration Module (LCM) and an integrated membrane degasser for removing dissolved N2, increasing sample detection levels. The LCM uses cryogen-free, thermoelectric cooling combined with our Advanced Purge and Trap (APT) separation technology to achieve TNb detection levels of 25 ppm.

High sample throughput thanks to direct analysis method

By performing direct analysis on the sample, the need for laborious pre-preparation of samples is removed. The direct determination of dissolved carbon and nitrogen out of the liquid phase ensures complete quantitative conversion of all compounds, so that offline sample preparation through freeze drying can be omitted. Designed for unattended 24/7 analysis, iso TOC cube offers highest sample throughput.

High system uptime thanks to low-maintenance design

The iso TOC cube features a 32 position autosampler, which is reloadable at any time. Whenever maintenance is necessary, our user-friendly clamp connections ensure a tool-free experience, while the slide-out furnace guarantees easy accessibility and a comfortable working posture.

Future-proof thanks to 10 years warranty

Thanks to the outstanding robustness and longevity of our iso TOC cube, we grant a 10-year warranty on the high-temperature combustion furnace. With our long-term oriented dedication to technical support, we provide spare parts for a minimum of 10 years. This results in outstanding low total cost of ownership, giving you confidence in return of investment.