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water analysis & purification


Issue 2 2018

Water quality measurements made easy AQUALOG is the only instrument to simultaneously measure both absorbance spectra and fluorescence ExcitationEmission Matrices. EEMs are acquired up to a 100 times faster than with other instruments. Dedicated software automates traceable quinine sulphate unit calibration and correction of inner-filter effects and Rayleigh and Raman scattering lines, enabling rapid export to modelling algorithms like PARAFAC. The Horiba Aqualog now offers new deep UV absorbance and fluorescence excitation from 200nm, in addition to a fully automated sample queue tool to facilitate continuous data acquisition, analysis and export for immediate multivariate analysis with the Solo.

Some of the main features include: • The only true simultaneous absorbance-fluorescence system available

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TE-cooled CCD fluorescence emission detector for rapid data acquisition up to 100 times faster than any other benchtop fluorometer Corrected UV-VIS absorbance detection path for stability and accuracy Double grating excitation monochromator for superior stray light rejection Matching bandpass for absorbance and fluorescence spectra Automatic sample changer option (2- or 4-position) Compatible with flow cells and titrator Optimised experiment set-up menus minimise user configuration time Complete NIST-traceable corrected fluorescence spectra automatically generated Spectral and kinetic analysis tools for both absorbance and fluorescence data Methods and batch protocols for automating multiple sample measurement

WIRSAM SCIENTIFIC JHB: (011) 482 1060 CPT: (021) 386 9020 DBN: (031) 709 0199 PE: (041) 365 2060 VT: (016) 931 1731

Efficient water analysis with Excellence titrators FOR environmental applications where water analysis using classic test parameters such as hardness or alkalinity is a priority task, Mettler Toledo’s T7 Excellence titrator provides the innovation you need. This fully automated titration system with the InMotion autosampler provides accurate water analysis with maximum sample throughput – up to 313 samples.

The Excellence T7 features One Click titration technology for secure, simple and efficient titration. The benefits of this intuitive user interface include modularity, flexible user management, automatic burette recognition and ‘plug and play’ sensors. A single sample or an entire series of samples can be started with just one touch to the short-cut key on the colour display.

Mettler Toledo’s InMotion autosamplers offer a water bath version that allows samples to be run at the same temperature, eliminating discrepancies in pH or conductivity results due to temperature differences. Another unique feature is that the titration head is able to stop at two alternative sample heights. Typically, the conductivity sensor is positioned lower than the other electrodes and tubes to minimise contamination as it stops at the first down position during multiparameter analysis. After conductivity measurement is complete, the head will move down completely to submerge the other electrodes and continue with the rest of the analysis (pH, alkalinity, hardness, chloride). The LabX 2018 platform provides the convenience of a centrally managed software system that can control several different instruments including balances, density meters, refractometers, melting point apparatus, quantos, Karl Fischer and titrators, as well as pH meters and UV/VIS spectrophotometers. A single database means all users can access the same methods, sample series, results, and more, whether at the instrument or using a remote computer.

MICROSEP (PTY) LTD Rudy Maliepaard Tel: (011) 553 2300 Fax: (011) 553 2400

Determination of chromate in drinking water HEXAVALENT chromium (Cr (VI)) is considered toxic and potentially carcinogenic; hence its concentration in environmental and drinking water should be as low as possible. Hexavalent chromium released into nature ends up in drinking water, causing significant contamination: even minute doses are harmful to the environment and to health. In the environment, chromium is encountered primarily in the two forms Cr (III) and Cr (VI). Whereas Cr (III) compounds pose no major risk (and are essential for humans), hexavalent chromium (also called hexachrome, chrome-6, and Cr (VI)) is harmful. The strong oxidising agent Cr (VI) is classified as carcinogenic, mutagenic, and damaging to the DNA. Acute chromium (VI) poisoning leads to renal damage. Chronic Cr (VI) exposure can lead to changes in the gastrointestinal tract. If inhaled, it can cause lung cancer. Because hexavalent chromium dissolves very readily in water, the result is high bioavailability and mobility. Chromium is used in the production of steel (added to give greater hardness and resistance to corrosion), in the electroplating industry (surface treatment by means of chromium plating; passive films by means of chromatisation), in

leather production (chrome tanning), and as a pigment in dyes and coatings. Chromium was also used as an impregnating agent for wood. Limestone and clay, the starting materials for cement, also contain chromium in the form of Cr (III), some of which oxidises to Cr (VI) during the production of cement. Metrohm has developed a highly sensitive ion chromatographic method for determining hexavalent chromium that is now part of the latest EPA Method 218.7. The analysis is explained in detail in the IC Application Note U-69. METROHM SA (PTY) LTD Tel: (011) 656 1918 CT: (021) 852 0213 DBN: (031) 265 0067 Fax: (011) 656 2698 078 643 7113

Ultrapure water from flexible hand-held dispenser THE Elga Purelab Flex 3 and 4 range offers many advantages for analytical and life science applications. It allows users to focus on routine test work, without having to worry about the water quality affecting any test results. The point-of-use display provides absolute confidence in the water purity as the ultrapure water is dispensed. It displays clear, easy to understand information at all times, such as system status, temperature, alarms, time and Total Organic Carbon (TOC). The TOC reading, critical for sensitive analytical applications, is in real time providing an advantage over other conventional TOC monitors which provide a delayed response reading. Point-of-use filters efficiently remove biological impurities such as endotoxins, DNase, RNase and bacteria. These water purification systems have a flexible ergonomic patent-pending handset that fits comfortably in the hand for point-of-use dispensing. It provides a convenient range of multiple dispensing options from proportional control (drop by drop) and auto volume to locked dispense for quick filling of large laboratory glassware. With its easy access doors routine sanitisation is accomplished in minutes, saving users’ precious time. The patentpending sanitisation cartridge makes sanitisation minimal with no manual handling of any chemicals.

Purelab 3 and 4 systems deliver up to 10 litres of ultrapure water per day and up to two litres per minute. The Purelab Flex 3 delivers ultrapure water direct from potable tap water and Purelab Flex 4 requires a prepurified feed. The Purelab Flex conforms to international water standards (CLSI, CLRW, ISO 3696: Grade 1,2,3, ASTM, D1193-06, Pharmacopeia US, EP and JP). Validating the water quality has never been easier using the system’s USB port to capture the data on to a flash drive. These systems can be adapted to respond to a laboratory’s constantly changing water purity needs. LABOTEC (PTY) LTD JHB: (011) 315 5434 CT: (021) 531 7660 DBN: (031) 566 4870 Fax: (011) 315 5882

Analytical Reporter Issue2 2018  

Issue 2 of Analytical Reporter is a bumper one, filled with news on water analysis and purification, and also equipment that is available fo...

Analytical Reporter Issue2 2018  

Issue 2 of Analytical Reporter is a bumper one, filled with news on water analysis and purification, and also equipment that is available fo...