1991 Fiscal Year Final Research Report Summary
Basic Research on the Simplified Photoacoustic Spectrometer for General Purpose
| Project/Area Number |
02650534
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業分析化学
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| Research Institution | Yamagata University |
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Principal Investigator |
SHIDA Junichi Yamagata University Faculty of Engineering Assistant Professor, 工学部, 助教授 (40007026)
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| Project Period (FY) |
1990 – 1991
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| Keywords | Photoacoustic spectrometry / Apparatus for general purpose / Diode laser / Preconcentration with ion-exchange resin / Preconcentration with membrane paper / Environmental water sample |
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| Research Abstract |
1. Design of a simplified photoacoustic spectrometer for general purpose The light source was used a diode laser head(wavelength, 826 nm)connected directly with a photoacoustic cell. Therefore, the space of light source and cell was reduced. to one tenth.
2. Trial production of photoacoustic cell and conditions of measurement A photoacoustic cell made of brass(w 50 mm, D 60 mm, H 70 mm)was original. When the laser power was 30 mW(current, 104 mA)and the frequency was 39 or 69 Hz, photoacoustic intensity was strong and stable.
3. Application to practical samples For the determination of trace phosphate in water samples, spectrophotometric and visual methods, based 6n collecting a molybdenum bluecation surfactant precipitate on a membrane filter, were developed. Detection limits of phosphate ion were 0.2 mug and 0.05 mug, respectively. The photoacoustic intensity of the precipitate on a membrane filter was measured by the apparatus of our own making. The calibration graph was linear in the range 0.05-1.0 mug of phosphate ion. To increase the sensitivity by decrease of background in the cell, trial production of another cell with differential microphone are done actively.
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