35


The wet chemical UV digestion technology is especially suitable due to its extraordinary measurement sensitivity and the gentle digestion method compared to the catalytic high temperature combustion. The large injection volume of samples up to 20 ml makes the multi N/C® UV HS one of the most sensitive TOC devices on the market. The multi N/C®


UV HS especially


stands out through its specifically designed UV reactor, which not only uses the common UV radiation of 254 nm but also the high energy short-wave radiation at 185 nm in order to oxidise organic compounds. This brings the advantage that no addition of the oxidation agent sodium peroxodisulphate, which is burdened by a TOC blank value, is required for the complete oxidation of ultrapure water. The UV radiation and the dissolved oxygen in the sample itself are sufficient to


convert all organic compounds into CO2. This allows extremely reliable TOC measurement results, unspoiled by blank values, in the boiler feed water and in other ultrapure waters up to drinking water analysis.


Table 2. The multi N/C® UV HS: lowest concentration at highest precision.


TOC and TNb in smallest sample volumes Especially in the field of research, when it comes to the determination of contaminations in glacial ice, connate water, soil extracts or rainwater, only small sample volumes (often no more than a few millilitres) are available for the TOC measurement, due to other different parameters to be done.


However, there is a very high number of samples to be analysed in the case of such environmental analysis in order to have an interpretable data base. This calls for automated TOC analysers that do not use the majority of the sample for the rinsing of hoses and valves but for measurement.


The determination of proteins according to Ph.Eur. 2.5.33 in the pharmaceutical industry, whether in vaccines or pollen suspensions, also has this requirement towards a modern analysis system.


The specialist in this field is definitely the multi N/C® 2100 direct injector which allows multiple


determinations even with a sample volume of less than 1 ml due to its 100µl syringe. On top of that the 112 sample tray even provides magnetic stirring for an optimal sample homogenisation in the 2 ml vials.


multi N/C® – the right solution for every matrix and measurement task


Summary As can be seen from the examples, many TOC/TNb applications require the special capabilities of a field specialist to be able to do stable and successful analysis in the long term. The multi N/C®


series by


Analytik Jena AG provides you with the right analyser for each application. With the built-in Self Check System the devices are designed for maximised operation security and ease of use in unattended 24 hour operation. The associated high system availability essentially increases productivity in your laboratory and significantly contributes to the reduction of running costs.


Expanded Range of Analyses Services Offered for Extractables and Leachables


Schott AG has experienced a strong demand for laboratory services related to so-called ‘extractables and leachables’ and therefore continued to expand this range of analyses offered to its customers. Extractables and leachables are substances, which can be dissolved and released from the constituent parts – glass, metals, rubber, lubricants and adhesives– of the packaging materials that form the container system. To determine any possible interactions with the drugs and exclude them, pharmacists are obliged to perform extensive studies. This procedure is mainly intended for the protection of patients. “Through our extended service offering, we are now able to support pharmaceutical even more efficiently in the assessment of risks,” said Dr Uwe Rothhaar, Director of Schott pharma services division. By strengthening the ‘Extractables & Leachables’ range of analyses, Schott pharma services underlines its position as an experienced partner for pharmacists who benefit not only from Schott’s decades of expertise but also from a combination of laboratory services, which is unique in the market.


Since the Schott group started to produce pharmaceutical containers made of glass and also commenced to manufacture pharmaceutical packagings such as ampoules, vials, cartridges and syringes, the Company has built up comprehensive product and process know-how. Schott maintains a basic research centre for glass by itself. This know-how and these professional skills have been pooled in the Schott pharma services division and have also been available to enterprises outside the group. “An increasing number of drug manufacturers ask us to test their outer packages. The spectrum ranges from the analysis of interactions between drug and packaging materials to fracture and strength tests”, stated Rothhaar. His team offers a wide range of analytical services based on the modern instruments of a laboratory whose state of the art is ensured by continuous investments of Schott. In addition, the resources of the central Research and Technology Development division of Schott can be called on as well. The entire laboratory as well as all lab operations and processes are accredited to DIN EN ISO 17025 and thus guarantee highest quality standards.


MORE INFO. 114


New Cyclone Mill for Sample Preparation to NIR Analysis


Retsch‘s new cyclone mill TWISTER is specially designed for the processing of foods and feeds for subsequent NIR analysis. The optimised form of rotor and grinding chamber generates an air jet which carries the ground sample through the integrated cyclone into the sample bottle. The air jet prevents the material from heating up, thus preserving the moisture content. The provided sieves guarantee an optimum particle size distribution so that it is not necessary to recalibrate the NIR spectrometer. The rotor speed can be adjusted in 3 steps allowing for perfect adaptation to the sample requirements. Cleaning the mill is quick and easy as the air jet effects a complete discharge of the material from the grinding chamber.


This new cyclone mill in proven Retsch quality optimises the reproducible sample preparation to NIR analysis thus allowing for meaningful and reliable analysis results.


Benefits include: ideal for grinding feeds, grains, forage and similar products; 3 controlled speeds; including rotor, grinding ring and sieve sections (1mm and 2mm); cyclone separator with 250 ml collecting bottle for quick extraction of sample; no cross contamination thanks to easy cleaning; convenient operating panel; professional industrial design with long lifetime.


MORE INFO. 115


INTERNATIONAL LABMATE - MARCH 2013


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