Development of sulfide-selective optode membranes based on immobilization of methylene blue on optically transparent triacetylcellulose film

作者：Shamsipur M^*; Tashkhourian J; Sharghi H

来源：Instrumentation Science & Technology, 2005, 33(6): 703-714.

DOI：10.1080/10739140500311304

• sulfide optode
• methylene blue
• triacetylcellulose film

The development of reversible sulfide-selective optode membranes, based on immobilization of methylene blue (MB) on optically transparent triacetylcellulose film, is described. The sensing scheme of the sulfide-selective optode membranes is based on the decreasing absorbance of the membrane at 654 nm in the presence of sulfide, which can be related to the sulfide concentration in solution. The dynamic working range, detection limit, sensitivity, selectivity, and effect of pH are discussed in detail.
Under optimum experimental conditions, the membrane system shows a calibration response range from 3.1 x 10(-5) to 6.1 x 10(-4) M in a phosphate buffer of pH 7.5. Typical response times in the samples are 15-20 min. The lifetime of the system was about 30 days, with a relative standard deviation of < 2%. The sensing membrane showed a good selectivity to sulfide over other anions. The optode membrane was applied to the determination of sulfide in real samples.

• 出版日期2005-12