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Citation: LUO Fa-Liang, LIU Zhi-Hong, CHEN Tian-Lu. Photo Chemical pH Sensitive Membrane of Cross-linking PVA with Congo Red Fixed on It[J]. Chinese Journal of Applied Chemistry, ;2005, 22(3): 233-237. shu

Photo Chemical pH Sensitive Membrane of Cross-linking PVA with Congo Red Fixed on It

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: CHEN Tian-Lu,
Received Date: 22 June 2004
Available Online: 13 November 2004
Fund Project: 国家自然科学基金(50273037)资助项目 (50273037)

Two kinds of photo chemical pH sensing membranes PECM and PFCM,for optic pH sensors,with epichlorohydrin cross-linked PVA and formaldehyde cross-linked PVA gel as matrices are described.Their pH linear response ranges are within 2 mol/L[H⁺]~pH 6.8 and pH 2.9~pH 5.4,respectively.The response time of both the membranes is less than 10 s when ΔpH is within 2 pH units.Experimental results show they have good reproducibility and reversibility.
- polyvinyl alcohol,
- pH sensitive membrane,
- congo red
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