705 UV Digester by Metrohm AG
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Metrohm AG Contact InformationMetrohm AG
Oberdorfstr. 68
CH-9100 Herisau
Phone +41 71 353 85 85
Fax +41 71 353 89 01
http://www.metrohm.com/
info@metrohm.com |
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Searched and found02 m ptfe 10 cm in m 100 240 v 15 60 50 hz 12 x 6 15 mm 15 mm aluminum tubing 15 mm tube 500 mm length 705 uv digester 90 mm aluminum tubing adjustable water flow control valves ag ch ag spare parts aluminum tube 15 mm blank value cooling fan temperature switch diameter measuring devices digester digester heavy metal din standard din standards din standards for pressure din standards for pressure vessel direct acting valve filter ag flow valve heavy metal high pressure equipment lamp switches lamp uv lampe uv mercury 90 mercury switch metrohm ag 9101 herisau pvc valve handle temperature control valve watt uv uv lamp uv lamps uv lamps water treatment very low temperature voltammetry wastewater water cooled water cooling water flow water flow control water flow valve water temperature switch water treatment filters water treatment plant water treatment uv water tubes wet digester x 240 transformer
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705 uv digester a distinct advance in sample preparation for the trace analysis of heavy metals with voltammetry polarography aas or icpaes.
| the digestion is half the work no digestion no information this principle virtually always holds true when trace amounts of heavy metals have to be determined at the very least in the development and validation of the analysis method digestion operations with real and simulated matrices must be used to clarify whether the untreated sample provides representative results this applies irrespective of whether you work with voltammetry/polarography aas or icp-aes digestion operations are usually specific to a particular combination of matrix and analysis method and are thus extremely diverse digestions are indispensable when the substance to be determined · is present as an insoluble compound · is strongly adsorbed on a solid or fixed in a solid matrix · forms part of a stable complex which is not responsive to the analysis · occurs together with organic compounds thatpersistently disturb the analysis or even render it impossible in the past few years digestion operations have clearly inc
| 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 obta
| the most important features of the 705 uv digester design of the instrument the 705 uv digester comprises a wet part and a control unit the wet part contains the uv lamp the cooling equipment and the sample holder for 12 samples the control unit contains all controls needed for the operation including a time switch to set the irradiation time uv lamp high-pressure mercury lamp length 10 cm power consumption 500 watts cooling combined water-air cooling the fan cools the samples by air circulation in a practically closed loop the heated air then gives up its heat to water flowing through the aluminum cylinder the cooling water flow is adjustable digestion temperature up to 90 °c lower limit depends on the cooling water temperature setting of the digestion temperature with flow valve for the cooling water measurement of sample temperature with a mercury thermometer directly in one of the sample vessels overheating protection the uv lamp switches off automatically if the sample chamber is
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