HACH LANGE cuvette tests: Minimum amounts of reagents, maximum safety.

During a photometric analysis, in addition to the compounds listed in the interferences table, turbidity and colouration can lead to false results. These errors come either from the sample itself or arise from reactions with the reagents. The influence of the turbidity and/or colouration can be determined by establishing the sample specific blank value.

More clarity through colourcoding; uniformly coloured packaging, cuvette labels and caps improve daily operations; new colour system quickly explained; 2 pages

Produkt Information: LANGE cuvette test, 2 pages with benefits, technical details: IBR, Integrated barcode reader, 10 fold measuremt system; chart of variety of paramters and measuring ranges

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The leachate from a landfill in North Rhine-Westphalia, Germany, used to be transported by road tanker to the nearest sewage treatment plant. Since 1998 a biological treatment plant has been in operation, which has now handled more than 650,000 m3 of leachate, at a maximum rate of 350 m3/day. Four activated carbon filters, each filled with 20 m3, handle the residual COD load. The wastewater is fed into them in a sequence that depends on how long the activated carbon has been in use. A freshly regenerated filter discharges treated wastewater with a COD concentration of about 50 mg/l; this is well below the limit of 400 mg/l and is therefore a major cost factor. This can be avoided with the help of the COD cuvette test. 4 pages

The document reports of the advatages of the LANGE cuvette tests. Author: Dipl.-Ing. Petra Puetz, HACH LANGE Lab product specialist. The launch of the world s first ready-to-use reagent packages for photometric analysis in the 1960s had a substantial effect on environmental analysis. Today LANGE cuvette tests and photometers are indispensable elements of operational analysis. Innovations such as 10-fold rotational measurement have simplified analysis even further and made it more reliable. Quality assurance procedures (analytical quality assurance ADDISTA, round robin tests) are carried out and documented. The correct processing of used reagents in HACH LANGE s own certified environment centre completes the LANGE cuvette test-system. 8 pages

Author: Petra Puetz, HACH LANGE applications laboratory products specialist; The elimination of nitrogen compounds is a fundamental aspect of wastewater treatment. Nitrification and denitrification have to be controlled as efficiently as possible to ensure that outflow concentrations comply with the legal requirements. This is where analysis comes in, as enduringly stable and cost-effective plant operation depends on targeted and comprehensive measurements of the individual N parameters. The best results are obtained using a combination of laboratory analysis (cuvette tests) and process measurement technology (online sensors) at suitable measurement locations in and at the end of the wastewater treatment process. 4 pages