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Citation: CHENG Xiao-Hong, ZHANG Zhu-Jun, TIAN Sui-Kang, TIAN Wei. Trace Formaldehyde Determination Based on Combination of Liquid Core Waveguide and Light Intensity Difference Technique[J]. Chinese Journal of Applied Chemistry, ;2007, 24(2): 144-147. shu

Trace Formaldehyde Determination Based on Combination of Liquid Core Waveguide and Light Intensity Difference Technique

1.
School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062

Corresponding author: ZHANG Zhu-Jun,
Received Date: 22 March 2006
Available Online: 6 June 2006
Fund Project: 国家自然科学基金(30470886) (30470886)

A novel long path absorbance spectroscopy(LPAS) for the determination of trace formaldehyde was established.Trace formaldehyde was determined by the combination of liquid core waveguide(LCW,9 cm) and light intensity difference technique(△I),with an ultra bright red light emitting diode(LED) working as spectroscopic source and a photodiode as photodetector.It was analyzed following Chinese National Standard of determination for formaldehyde in public air,GB/Y18204.26-2000.The linear range and detection limit of the proposed method were 1.0×10^-11~1.0×10^-9g/mL,7×10¹²g/mL,respectively.The relative standard derivation(RSD) for 1×10¹⁰g/mL formaldehyde was less than 1.0%(n=11).The results shown that both the low limit of linear range and the detection limit of this method were over 1000-fold lower than that of usual UV-Vis method.
- liquid core waveguide,
- light Intensity difference,
- formaldehyde,
- spectrophotometry
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