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Citation: LONG Li-Ping, LEI Cun-Xi, ZHONG Tong-Sheng. A Sulfite Optical Chemical Sensor[J]. Chinese Journal of Applied Chemistry, ;2004, 21(11): 1145-1149. shu

A Sulfite Optical Chemical Sensor

1.
Department of Chemistry & Environmental Engineering, Hu'nan City College, Yiyang 413049

Corresponding author: LONG Li-Ping,
Received Date: 15 December 2003
Available Online: 10 April 2004
Fund Project: 湖南省教育厅科学研究基金资助项目(03C116) (03C116)湖南省科技计划基金资助项目(03JZY3034,03JZY3042) (03JZY3034,03JZY3042)

An optical chemical sensor has been developed to detect sulfite based on reversible fluorescence quenching of tetraphenylporphyrin(TPP)/2,6-di-o-isobutyl-β-cyclodextrin(DOB-β-CD) immobilized in a plasticized poly(vinyl chloride)(PVC) membrane. The optimum sensor membrane consists of 50 mg of PVC, 100 mg of bis(2-ethytbexyl) sebacate(BOS), 2.5 mg of TPP and 10 mg of DOB-β-CD. The maximum response of the optode memberane for sulfite was obtained in a KOH-KH₂PO₄ buffer solution of pH=6.5. The sensor responds linearly to sulfite in the concentration ranged in 6.22×10^-6 to 3.11×10^-4 mol/L, with a detection limit of 7.80×10^-7 mol/L. The response time of the sensor is less than 40 s. In addition to high reproducibility and reversibility of the fluorescence signal, the sensor also exhibits good selectivity. Some common anions, cations and foreign substances do not interfere with the sulfite detection. It has been applied in direct determination of sulfite in a sample of industrial waste water with satisfactory result.
- sulfite,
- optical chemical sensor,
- tetraphenylporphyrin,
- di-o-isobutyl-β-cyclodextrin
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