Photoacoustic spectroscopic studies on the solid phase cell with a differential type microphone using a diode laser as radiation source

The design and applications of the solid phase photoacoustic cell with a differential type microphone are described. This cell has higher sensitivity and reproducibility relative to a cell without a differential microphone. The method has been applied to the determination of phosphate ion in water s...

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Bibliographic Details
Published in:Talanta (Oxford) 1994-11, Vol.41 (11), p.1861-1864
Main Authors: Shida, Junichi, Takahashi, Hideaki, Oikawa, Kazuo
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary:The design and applications of the solid phase photoacoustic cell with a differential type microphone are described. This cell has higher sensitivity and reproducibility relative to a cell without a differential microphone. The method has been applied to the determination of phosphate ion in water samples. The detection limit for phosphate ion concentrated from 22.5 ml of sample solution on a membrane filter as molybdophosphate- n-dodecyltrimethylammonium bromide was 3.0 ng PO 3− 4/ml and the coefficient of variation for five measurements at 20 ng PO 3− 4/ml of phosphate ion was 3% using a diode laser (30 mW, 826 nm) as radiation source. The calibration graph for phosphate ion was linear over the range 5–50 ng PO 3− 4/ml.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(94)80192-4