title: Anion-exchange nanospheres as titration reagents for anionic analytes.
abstract: We present here anion-exchange nanospheres as novel titration reagents for anions. The nanospheres contain a lipophilic cation for which the counterion is initially Cl(-). Ion exchange takes place between Cl(-) in the nanospheres and a more lipophilic anion in the sample, such as ClO4(-) and NO3(-). Consecutive titration in the same sample solution for ClO4(-) and NO3(-) were demonstrated. As an application, the concentration of NO3(-) in spinach was successfully determined using this method.
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.
authors.forename: Jingying
authors.initials: J
authors.lastname: Zhai
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.
authors.forename: Xiaojiang
authors.initials: X
authors.lastname: Xie
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.
authors.forename: Eric
authors.initials: E
authors.lastname: Bakker
mesh_terms: D000838:Anions / Q000032:analysis* / Q000737:chemistry; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D054118:Nanospheres / Q000737:chemistry*; D018724:Spinacia oleracea / Q000737:chemistry; D017186:Titrimetry
chemical_list: D000838:Anions