The residue analysis of auxiliary and operating materials from metal cutting is not new territory for us, nor are salts from etching or pickling processes, electropolishing or passivation. Through constant contact with a wide range of manufacturers, we can apply our understanding to your advantage.

chemische Analysen Metall, Auftragslabor, Deutschland
Innovative special services for the metalworking industry

In metalworking, a wide variety of chemicals are used as auxiliary and operating materials that are undesirable on finished products.

If these are acids or alkalis, ion chromatography is often the most suitable method for identifying residues and, if necessary to optimise purification processes.

For cooling lubricants or other substances with organic components (grinding pastes, mineral oils, lubricating oils or drawing oils), it is necessary to select from the available methods those that are suitable for the reliable detection of the target substance(s).

We have a wide range of gas and liquid chromatographic methods in our portfolio to offer you both overview methods with recognised high coverage and target substance specific analysis.

Ion residues (e.g. from acids and alkalis):

Ion Chromatography IC

Sample preparation

The Ion Chromatography is the method of choice to detect inorganic ions sensitively. After separation single ions are detected due to their conductivity.

A typical relative measurement uncertainty is ±10%.

Measurement of organic residues from auxiliary and operating materials:

Gas Chromatography coupled with Mass Spectrometry GC-MS

Injector of a gas chromatograph

Ph.Eur. 10,2.2.28 - Gas Chromatography [accredited method: PL-19422-01]

This is the most sensitive method to analyze single components in complex mixtures. But only organic substances which can be vaporized without decomposition can be analyzed.

Organic compounds generate so called mass spectra. To identify unknown compounds the mass spectra will be compared with the NIST library in a current issue. This comprehensive library is the world’s most widely used mass spectral reference library with more than 240.000 entries.

A typical relative measurement uncertainty is ±10%.

Gas chromatography coupled with Flame Ionization Detector GC-FID

Ph. Eur. 10, 2.2.28 – Gas Chromatography [accredited method: PL-19422-01]

Gaschromatograph mit Autosampler
Gas Chromatograph with FID Detector

This is the most sensitive method to analyze known components in complex mixtures. The high linearity provided by the FID in this system makes it suitable for quantitative work.

A typical relative measurement uncertainty is ±10%.

High Performance Liquid Chromatography with Light Scattering Detector HPLC-ELSD

Flüssigchromatographie mit Diodenarray-Detektor und Lichtstreudetektor
Liquid chromatopraphy with diode array detector and light scattering detector

Ph. Eur. 10, 2.2.29

HPLC is a standard method for the determination of higher molecular weight compounds. In order to determine single compounds in complex mixtures qualitatively and quantitatively, the enormous separation performance of the liquid chromatographic system is used. The ELSD detector provides a sensitive and linear detection system for a large number of compounds that cannot be detected with other detector types (e.g. UV detector).

A typical relative measurement uncertainty is ±10%

We can offer the following methods for inspecting surface structures, solid residues or corrosion:

Scanning Electron Microscopy with Energy Dispersive X-Ray according to DIN ISO 22309:2015-11 SEM-EDS

passion for chemical analysis
Specimen chamber of the scanning electron microscope

[accredited method: PL-19422-01]

Microbeam analysis – Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above. Good results will be obtained for mass fractions down to 1%. SEM-EDS is the standard method for surface and particle analysis. Single particles can be inspected and identified on the basis of the emitted X-Ray spectra.

A typical relative measurement uncertainty for quantitative analyses is ±10%.


Infrarotspektroskopie_Messung am Diamant ATR
Infrared spectroscopy: Measurement on the diamond ATR

Ph. Eur. 10, 2.2.24 – Infrared spectroscopy [accredited method: PL-19422-01]

The best known and most widely used method for the analysis of organic compounds. After excitation with an IR source, each functional group in a molecule absorbs energy at distinguished frequencies. The spectra obtained are additive, from summation of individual components. Therefore, single components under 1% of the total cannot be detected with certainty.

The focal area of the IR Microscope covers 2,500µm² (0.0025mm²). Determining the limit of detection and limit of quantification is difficult, as analytes rarely cover surfaces in a homogenous manner. Usually, they exist in form of locally accumulated residues. Such accumulated residues can easily be identified at areas of approx. 100µm² or larger. Conversely, smaller areas are more difficult to analyze. The order of magnitude for easily detectable amounts is about 0.1µg/mm².

A typical relative measurement uncertainty is <1%.

We are pleased to offer quantitative and qualitative particle testing:

Light optical particle analysis (JOMESA)

Partikel Labor
Sample preparation for particle analysis

Particles are measured and counted on filters by a digital camera in a fully-automated optical microscope. Polarized light is used to discriminate between metallic and non-metallic particles.

A typical relative measurement uncertainty is ±10%.

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