optical chemical sensor for mercury ion based on 2-mercaptopyrimidine in PVC membrane

• Published in: Analytical and bioanalytical chemistry 2008-04, Vol.390 (7), p.1943-1950
• Main Authors: Khezri, Bahareh, Amini, Mohammad K, Firooz, Ali R
• Format: Article
• Language: English
• Subjects: 2-Mercaptopyrimidine; Analytical Chemistry; Biochemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Electrodes; Food Science; Hydrogen-Ion Concentration; Ions - analysis; Laboratory Medicine; Membranes, Artificial; Mercury - analysis; Mercury ion; Molecular Structure; Monitoring/Environmental Analysis; Optical chemical sensor; Optics and Photonics; Original Paper; Polyvinyl Chloride - chemistry; Pyrimidines - chemistry; Reproducibility of Results; Sensitivity and Specificity; Spectrophotometry, Ultraviolet - methods; Surface Properties; Time Factors; trace elements; water analysis
• ISSN: 1618-2642; 1618-2650
• DOI: 10.1007/s00216-008-1906-2

An optical chemical sensor based on 2-mercaptopyrimidine (2-MP) in plasticized poly(vinyl chloride) (PVC) membrane incorporating (N,N-diethyl-5-(octadecanoylimino)-5H benzo[a]phenoxazine-9-amine (ETH 5294) and sodium tetraphenyl borate (NaTPB) for batch and flow-through determination of mercury ion is described. The response of the sensor is based on selective complexation of Hg²⁺ with 2-MP in the membrane phase, resulting in an ion exchange process between H⁺ in the membrane and Hg²⁺ in the sample solution. The influences of several experimental parameters, such as membrane composition, pH, and type and concentration of the regenerating reagent, were investigated. The sensor has a response range of 2.0 x 10⁻⁹ to 2.0 x 10⁻⁵ mol L⁻¹ Hg²⁺ with a detection limit of 4.0 x 10⁻¹⁰ mol L⁻¹ and a response time of