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- W2003192056 abstract "A continuous method for the measurement of SO2 in ambient air at trace levels is described. The principle of detection is based on the anodic oxidation of SO2 in a galvanic cell. A differential measuring technique with a cell with two anodes and one cathode is used; background and noise current are low and stable. A feature of the measuring system is that the air sample is passed through a porous anode against a head of electrolyte on the other side of the anode. The minimum values for the time constant and the lower detection limit were 3 seconds and about 3 μg/m3, respectively. The selectivity of the method was compared with those of other techniques in field testing. Trace concentrations measured by the galvanic method in the range from 12 to 135 μg/m3 were in good agreement with those of the flame photometric and the West-Gaeke method. With a Pt/Ni2B/graphite anode the mean oxidation efficiency was 94 ± 2% on the basis of 2 faraday/mol of SO2 within the tested concentration range of 50 to 560 μg/m3. During a field test no decrease in the anode activity was observed over a period of ten months. Examples are given for the galvanic detection of other compounds using porous measuring electrodes. Chemicals/CAS: sulfur dioxide, 7446-09-5" @default.
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- W2003192056 date "1978-02-01" @default.
- W2003192056 modified "2023-09-25" @default.
- W2003192056 title "Galvanic Detection of Sulfur Dioxide in Ambient Air at Trace Levels by Anodic Oxidation" @default.
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- W2003192056 doi "https://doi.org/10.1080/00022470.1978.10470581" @default.
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