Photoacoustic detection of orthophosphate in aqueous solution

The photoacoustic spectroscopy at 633 nm wavelength of a 8 mW He-Ne laser has been used to measure the concentration of orthophosphate dissolved in distilled water. Determination is achieved through the combined use of the colorimetric molybdenum blue method with the high detection sensitivity offered by the photoacoustic technique. A concentration of 1 mmol m−3 (96 ppb) orthophosphate could readily be detected with the relatively simple experimental set-up.

[1]  Takehiko Kitamori,et al.  Determination of sub-part-per-trillion amounts of cobalt by extraction and photoacoustic spectroscopy , 1986 .

[2]  F. Harren,et al.  The Use of Reverse Mirage Spectroscopy to Determine the Absorption Coefficient of Liquid Methanol at CO2 Laser Wavelengths , 1989 .

[3]  N. Dovichi,et al.  Attomole amino acid determination by capillary zone electrophoresis with thermooptical absorbance detection. , 1989, Analytical chemistry.

[4]  T. Imasaka,et al.  Thermal lens spectrophotometry of phosphorus using a near-infrared semiconductor laser , 1985 .

[5]  T. H. Edwards,et al.  An Introduction to Infrared Spectroscopy , 1963 .

[6]  J. P. Riley,et al.  A modified single solution method for the determination of phosphate in natural waters , 1962 .

[7]  William E. Keiser,et al.  Introduction to Infrared Spectroscopy , 1970 .

[8]  C. Patel,et al.  Optical absorptions of light and heavy water by laser optoacoustic spectroscopy. , 1979, Applied optics.

[9]  T. Kitamori,et al.  Optimal geometrical conditions of photoacoustic signal detection with a cylindrical direct coupling cell for liquids , 1985 .

[10]  A. Tam.  Applications of photoacoustic sensing techniques , 1986 .

[11]  P. Nordal,et al.  Photoacoustic spectroscopy on ammonium sulphate and glucose powders and their aqueous solutions using a Co2 laser , 1977 .

[12]  N. Dovichi,et al.  Subattomole amino acid analysis by capillary zone electrophoresis and laser-induced fluorescence. , 1988, Science.

[13]  D. Bićanić,et al.  Reflection mode photopyroelectric spectroscopy of strongly absorbing liquids in the near infrared , 1988 .

[14]  M. Sigrist.  Laser generation of acoustic waves in liquids and gases , 1986 .