Page 3 of 705 UV Digester by Metrohm AG

application examples application range the following types of samples are suitable for digestion with the 705 uv digester · · · · ground water fruit juices wine sea water · lake water · river water · municipal wastewater if the samples contain suspended matter they have to be filtered before the digestion digestions with the 705 uv digester of a lake water sample and a sample of municipal wastewater are described here as examples nickel in lake water these samples contained a small proportion of solid matter they were thus filtered 0.45 µm microfilter and then digested in the 705 uv digester for 60 minutes at 90 °c determination was via adsorption and subsequent reduction of the nickel dimethylglyoxime complex adpcsv adsorption differential pulse cathodic stripping voltammetry without pretreatment the sample shows practically no nickel peak and the signal enhancement caused by the standard addition is extremely low after uv photolysis on the other hand easily evaluable peaks are obtained a nickel content of 1.1 ±0.1 µg/l results copper in the inflow of a water treatment plant this concerns a sample of municipal wastewater that had to be filtered circular filter and 0.45 µm microfilter to remove the solid fraction the samples were digested for 60 minutes at 90 °c in the 705 uv digester determination was via dpasv differential pulse anodic stripping voltammetry whereas the voltammogram of the untreated sample shows interference peaks that obtained after uv photolysis is completely free of these undesired phenomena a copper content of 31 ±2 µg/l was determined instruments for voltammetry and polarography 3

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