Fundamental study on compact absorptiometer for water quality testing
A compact absorptiometer for water quality testing that does not need a special technique to take measurements was studied where the absorbance of a sample solution could be stably measured without decreasing the sensitivity over time. Three types of devices were developed, namely, horizontal straig...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2015-08-01
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| Series: | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0033/_pdf/-char/en |
| _version_ | 1818532049932255232 |
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| author | Mitsuhiro MATSUZAWA Yukako ASANO Minoru MORITA |
| author_facet | Mitsuhiro MATSUZAWA Yukako ASANO Minoru MORITA |
| author_sort | Mitsuhiro MATSUZAWA |
| collection | DOAJ |
| description | A compact absorptiometer for water quality testing that does not need a special technique to take measurements was studied where the absorbance of a sample solution could be stably measured without decreasing the sensitivity over time. Three types of devices were developed, namely, horizontal straight-line type, vertical straight-line type, and multiple reflection type, that consisted of a light emitting diode (LED), a photodiode (PD), and a glass capillary used as a sample cell. The results from our experiments conducted to detect the nitrite nitrogen in water, which is a factor in water pollution, were used to evaluate how these three devices perform. The shapes of the liquid surfaces at the end of the capillaries in the horizontal and vertical straight-line types, which had the LED, PD, and the glass capillary in line horizontally and vertically, respectively, significantly influenced the output voltage of the PD and this output significantly changed over time, so it was difficult to precisely measure the absorbance. The change in the shape of the liquid surface at the end of the capillary was particularly considerable in the horizontal straight-line type. On the other hand, in the multiple reflection type, which had reflective plates surrounding the glass capillary, the absorbance was measured quite stably because the light emitted by the LED did not transmit through the liquid surface at the end of the capillary and the output voltage of the PD was uninfluenced by the change in the shape of the liquid surface. Additionally, controlling the sensitivity of the absorbance was possible by adjusting the length of the reflective plates, i.e., adjusting the light path. The sample solution in this device did not come into direct contact with the reflective plate, so the device can suppress the decrease in the sensitivity caused by materials becoming directly attached to the reflection plate. The compact multiple reflection type device that was developed could be used in a manually operated portable absorptiometer and also in an automated water quality analysis system that incorporates mixing and flow devices. |
| first_indexed | 2024-12-11T17:40:27Z |
| format | Article |
| id | doaj.art-b68cffead53d43fdbdab2d39c13fd6f8 |
| institution | Directory Open Access Journal |
| issn | 1881-3054 |
| language | English |
| last_indexed | 2024-12-11T17:40:27Z |
| publishDate | 2015-08-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| spelling | doaj.art-b68cffead53d43fdbdab2d39c13fd6f82022-12-22T00:56:33ZengThe Japan Society of Mechanical EngineersJournal of Advanced Mechanical Design, Systems, and Manufacturing1881-30542015-08-0193JAMDSM0033JAMDSM003310.1299/jamdsm.2015jamdsm0033jamdsmFundamental study on compact absorptiometer for water quality testingMitsuhiro MATSUZAWA0Yukako ASANO1Minoru MORITA2Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd.Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd.Infrastructure Systems Company, Hitachi, Ltd.A compact absorptiometer for water quality testing that does not need a special technique to take measurements was studied where the absorbance of a sample solution could be stably measured without decreasing the sensitivity over time. Three types of devices were developed, namely, horizontal straight-line type, vertical straight-line type, and multiple reflection type, that consisted of a light emitting diode (LED), a photodiode (PD), and a glass capillary used as a sample cell. The results from our experiments conducted to detect the nitrite nitrogen in water, which is a factor in water pollution, were used to evaluate how these three devices perform. The shapes of the liquid surfaces at the end of the capillaries in the horizontal and vertical straight-line types, which had the LED, PD, and the glass capillary in line horizontally and vertically, respectively, significantly influenced the output voltage of the PD and this output significantly changed over time, so it was difficult to precisely measure the absorbance. The change in the shape of the liquid surface at the end of the capillary was particularly considerable in the horizontal straight-line type. On the other hand, in the multiple reflection type, which had reflective plates surrounding the glass capillary, the absorbance was measured quite stably because the light emitted by the LED did not transmit through the liquid surface at the end of the capillary and the output voltage of the PD was uninfluenced by the change in the shape of the liquid surface. Additionally, controlling the sensitivity of the absorbance was possible by adjusting the length of the reflective plates, i.e., adjusting the light path. The sample solution in this device did not come into direct contact with the reflective plate, so the device can suppress the decrease in the sensitivity caused by materials becoming directly attached to the reflection plate. The compact multiple reflection type device that was developed could be used in a manually operated portable absorptiometer and also in an automated water quality analysis system that incorporates mixing and flow devices.https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0033/_pdf/-char/enabsorptiometerwater quality testingreflection platenitrite nitrogenoptical detector |
| spellingShingle | Mitsuhiro MATSUZAWA Yukako ASANO Minoru MORITA Fundamental study on compact absorptiometer for water quality testing Journal of Advanced Mechanical Design, Systems, and Manufacturing absorptiometer water quality testing reflection plate nitrite nitrogen optical detector |
| title | Fundamental study on compact absorptiometer for water quality testing |
| title_full | Fundamental study on compact absorptiometer for water quality testing |
| title_fullStr | Fundamental study on compact absorptiometer for water quality testing |
| title_full_unstemmed | Fundamental study on compact absorptiometer for water quality testing |
| title_short | Fundamental study on compact absorptiometer for water quality testing |
| title_sort | fundamental study on compact absorptiometer for water quality testing |
| topic | absorptiometer water quality testing reflection plate nitrite nitrogen optical detector |
| url | https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0033/_pdf/-char/en |
| work_keys_str_mv | AT mitsuhiromatsuzawa fundamentalstudyoncompactabsorptiometerforwaterqualitytesting AT yukakoasano fundamentalstudyoncompactabsorptiometerforwaterqualitytesting AT minorumorita fundamentalstudyoncompactabsorptiometerforwaterqualitytesting |