Aguayo-Lopez, M. L. published the artcileOptical sensor for carbon dioxide gas determination, characterization and improvements, Quality Control of 596-01-0, the publication is Talanta (2014), 196-201, database is CAplus and MEDLINE.
A study of different alternatives to improve the stability and lifetime of sensors for the determination of gaseous CO2 was performed. It includes the characterization of different sensing membranes, a discussion of the results obtained and possibilities for the future. The solid sensor membrane for gaseous CO2 based on changes in the luminescence of a luminophore immobilized on O2-insensitive film, concurrent with the displacement of a pH indicator, has some drawbacks, such as the loss of efficiency over time and the need to maintain the sensor in special atm. conditions. As a solution to these drawbacks, two alternatives were tested, the 1st alternative was replacing the newly proposed tetraoctyl ammonium hydroxide (TOAOH ) phase transfer agent with other basic agents that did not undergo a Hoffman degradation reaction, and the 2nd alternative was the use of hydrophilic polymers that could retain water needed for CO2 sensing more efficiently. The different membranes tested indicated that the use of tetra-Me ammonium (TMAOH) instead of TOAOH as the phase transfer agent produced better results regarding stability and sensitivity. Replacing the membrane polymer with hydrophilic polymers improved the sensing characteristics in terms of response time and stability over hydrophobic polymers. With a detection limit of 0.006%, the response time is 19 s and the recovery time is 100 s. The lifetime of the sensing membranes, which do not need to be held in any special atm. other than darkness, is longer than at least 300 days for membranes with TMAOH in hydrophilic polymer and 515 days for membranes with TMAOH in Et cellulose.
Talanta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.
Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem