title: Reflection of the Physiochemical Characteristics of 1-(2-pyridylazo)-2-naphthol on the Pre-concentration of Trace Heavy Metals.
abstract: 1-(2-pyridylazo)-2-naphthol (PAN) is a heterocyclic azo compound that forms inner, mostly reddish colored, water-insoluble chelates with many transition metal ions with metal ion-ligand ratios of 1:1 or 1:2. PAN is rather unselective but it does not form complexes with the alkali and alkaline earth metals, Ge(IV), As, Se and Te. Numerous reported techniques of pre-concentration have been considered for analyzing the role of PAN on the physiochemical outcome of the procedures. PAN been used as a chelating precipitant, flocculant, auxiliary complexing agent, as a ligand for anchoring on other supports with the purpose of introducing chelating property as well as selectivity. The role of PAN in the different techniques of pre-concentration, namely co-precipitation, membrane filtration, micro-extraction, cloud point extraction and solid phase extraction, has been investigated. PAN influences the optimum experimental parameters, namely pH, temperature, time, amount, tolerance limit, etc.
authors.affiliation: a Department of Chemistry , Faculty of Science, Jazan University , Jazan , Saudi Arabia.
authors.forename: Mohammad Asaduddin
authors.initials: MA
authors.lastname: Laskar
authors.affiliation: b Department of Chemistry , College of Science and Arts, Jazan University , Samtah , Saudi Arabia.
authors.forename: Sana
authors.initials: S
authors.lastname: Siddiqui
authors.affiliation: c Department of Chemistry , Faculty of Science, Aligarh Muslim University , Aligarh , India.
authors.forename: Aminul
authors.initials: A
authors.lastname: Islam
mesh_terms: D002627:Chemistry, Physical; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000737:chemistry* / Q000302:isolation & purification*; D009284:Naphthols / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D019216:Metals, Heavy; D009284:Naphthols; C041728:1-(2-pyridylazo)-2-naphthol
keywords: 1-(2-pyridylazo)-2-naphthol; chelating agent; heavy metals; pre-concentration