909 UV Digester
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Sample preparation for trace analysis of heavy metals

The 909 UV Digester is a modern digestion unit for sample preparation by UV photolysis. Organic molecules in the sample interfere with the determination of heavy metals, particularly in voltammetric or spectroscopic me­ ­ thods such as ICP and AAS. Based on the proven UV tech­­ nology, the new 909 UV Digester effectively elimi­ nates organic constituents in liquid samples. UV digestion provides fast and elegant sample preparation, particu­ larly with slightly contaminated samples. Digestion of samples in the 909 UV Digester is fully auto­ matic. The centerpiece of the digester is a UV lamp...

The key advantages • Controller and wet section in a single housing • Digital input of digestion temperature and digestion time • Microprocessor-controlled regulation of digestion temperature and digestion time • Air cooling, does not need a cooling water supply • Simultaneous digestion of up to 12 samples • Short digestion times • The blank values are practically zero because only very small amounts of reagents are needed • Also suitable for elements that form volatile compounds, e.g. mercury, arsenic, and selenium

UV digestion Organic constituents in the sample can interfere with the analysis in many ways. For example, a complexing agent can mask the analytes during determination or a com­ pound can generate an interfering analytical signal. UV digestion is a fast and clean method of decomposing such organic compounds. The actual reagent in the di­ ­ gestion process is UV radiation. Thus the blank values are practically zero, which is particularly advantageous for trace analysis. UV digestion is based on the principle of photolysis. This can be described in simple terms as breaking down mole­ cules...

Nickel and cobalt in wastewater Determination of nickel and cobalt in the same wastewater after UV digestion. Concentration of each: 1.8 µg/L Voltammogram for a determination of nickel and cobalt in wastewater without UV digestion Cadmium, lead, and copper in red wine 60.0n Voltammogram for a determination of cadmium, lead, and copper in red wine without UV digestion Determination of cadmium (concentration < detection limit), lead (17.7 µg/L), and copper (192.8 µg/L) in the same red wine after UV digestion. Speciation Another application field for the 909 UV Digester is spe­ ciation...

Wet section The samples are arranged concentrically around the UV lamp. A fan located in the base dissipates the heat generated by the operating lamp. A red shield protects the user’s eyes against harmful UV radiation. Pt1000 temperature sensor The glass-jacketed temperature sensor is placed into a reference sample. In this way the digestion temperature, controlled by the instrument, is directly measured. Sample holder with quartz sample vessels The sample is digested in a UV-transparent quartz vessel. A PTFE stopper acts as a condensation finger and prevents evaporation of the sample...

Technical data Digestion Digestion temperature Control accuracy Lamp power (controlled) Cooling Ambient temperature (operating range) Digestion time UV lamp Type UV-A (315...400 nm) UV-B (280...315 nm) UV-C (200...280 nm) Discharge tube temperature Length Outer diameter Useful life Medium-pressure mercury lamp 35 W 40 W 70 W 700...900 °C 137...139 mm approx. 16 mm 500...1’000 h Temperature measurement Sensor Pt1000 Measuring input Accuracy ± 0.2 °C (under reference conditions) Measuring range -20...+150 °C Power supply Voltage Frequency Power consumption Dimensions Width Height Height (with...

909 UV Digester (230 V) Digestion instrument for UV photolysis of water samples with low to medium organic load. For sample preparation in trace element determination by means of voltammetry, ion chromatography and spectroscopy (AAS, ICP). Instrument for 220...240 V and 50...60 Hz. Scope of delivery also includes Pt1000 temperature sensor PTFE stopper for UV quartz sample vessel (12 ×) Sample holder for 12 quartz sample vessels Quartz sample vessel 12 mL (12 ×) UV protective shield UV mercury vapor lamp Subject to change Layout by Ecknauer+Schoch ASW, printed in Switzerland by Metrohm AG,...