Study on atmospheric fluoride automatic analyzer by the method of fluoride ion selective electrode
Abstract
About an automatic analyzer for atmospheric fluoride by the method of fluoride ion selective electrode, an analysis of static and dynamic characteristics and a few errors about measurement system (electrode, amplifier and recorder) was shown in comparison with one hour and three hours of sampling time. On the basis of these analyses, the instrumental error of two apparatuses measured in an air-polluted region was considered. As a result, it appeared that the instrumental error cannot be explained only by the drift of the characteristics of the measurement system. This suggests that the sampling system (Teflon tube, filter and alkali coated spiral tube) sometimes lead to error. For measurements of atmospheric fluoride under the level of 1 ppb, counterplans for improvement in accuracy which can be done easily consist of setting a compensation device for variation of temperature and exchanging the recorder which is linear about concentration for one which is linear about electrode potential. Further, the decrease of flow rate from set value by drop of pressure in flow meter which leads to error about any measured value must be corrected by change of span value of recorder or others.
- Publication:
-
Japan Society of Air Pollution Journal
- Pub Date:
- 1979
- Bibcode:
- 1979JSAPJ..14...34Y
- Keywords:
-
- Air Pollution;
- Analyzers;
- Atmospheric Composition;
- Fluorides;
- Ion Probes;
- Air Sampling;
- Dynamic Characteristics;
- Instrument Errors;
- Solid Electrodes;
- Temperature Effects;
- Instrumentation and Photography