In the fourth installment in our series about the history of ion chromatography development at Metrohm over the years, we now focus on some of our combined analysis techniques. These are unique combinations of Metrohm instruments from different product groups which broaden application possibilities beyond what IC could accomplish alone. The TitrIC and VoltIC systems will be discussed in this installment.

TitrIC: combining titration, direct measurement, and IC in one

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Figure 1. The first-generation TitrIC system from the late 1990s, including an autosampler for higher sample throughput.

The combination of titration, pH, and conductivity measurement, as well as ion chromatography in a single analytical system was introduced in the late 1990s. This TitrIC system consisted of a Titrino for the determination of the p- and m-value (alkalinity), pH and conductivity meters, as well as a modular IC from the 732 IC Detector generation.

Depending on the analysis requirements, either a second Titrino (for the Ca/Mg water hardness determination) or a second IC channel (for alkali and alkaline earth metal cations as well as ammonium) was selected. The latter enabled an automatic determination of the ion balance for the first time.

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Figure 2. TitrIC has evolved: TitrIC 7 system seen here with 850 Professional IC series and Robotic Titrosampler has now become the TitrIC Flex (I and II), based on OMNIS titration and the 930 Compact IC Flex series.

The central unit is the autosampler, which directs the water sample to the titration/metering section and to the ion chromatographs. The respective titration software controls the titrators and pH/temperature meters, calculates the results, and transfers them to the IC software (at the time, IC Net). The IC software controls the ion chromatograph and creates the final report. The user only communicates with the master software, making comprehensive analysis a simple task. This combination was available in all Metrohm IC generations (Figures 1 and 2). The most current setup (TitrIC Flex I and II) combines the 930 Compact IC Flex instruments with OMNIS titration.

Learn more about the combination of titration, direct measurement, and IC analysis and what it can do for your laboratory efficiency with this collection of materials.

Blog article: Comprehensive water analysis: combining titration, IC, and direct measurement in one setup

Application Note: Comprehensive water analysis with TitrIC flex II

Brochure: TitrIC flex – All you need for comprehensive water analysis

VoltIC – Voltammetry and IC

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Figure 3. VoltIC Professional system developed in 2016 for the enhanced analysis of trace impurities in water samples.

Just as with titration, it also is possible to combine IC and voltammetry in order to further expand application capabilities for enhanced trace measurement of analytes in water. VoltIC Professional integrates these techniques in a single, fully automatic system that is controlled via a common software, providing users with the strengths of both IC and voltammetry. Anions, major cations as well as trace cations may be detected in one determination. 

Back in 2012, the original VoltIC pro system was launched to bridge the gap between these two techniques and to offer a unique solution to the market. In 2013, the new line of 940 Professional IC Vario instruments came along. A few years later in 2016, the 884 Professional VA analyzer was brought to the market, and thus VoltIC on the next level: the current VoltIC Professional system (Figure 3).

Is VoltIC the right choice for your laboratory? Find out more information with these materials below.

Brochure: VoltIC Professional – The flexible solution for combined trace analysis

Free Application Notes for the VoltIC Professional system

What's next?

In Part 5 of our series, we describe the use of ion chromatography for continuous air monitoring with the MARGA from Metrohm Process Analytics.

Author
Läubli

Dr. Markus Läubli

Manager Marketing Support IC
Metrohm International Headquarters, Herisau, Switzerland

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