title: Automated procedure for determination of ammonia in concrete with headspace single-drop micro-extraction by stepwise injection spectrophotometric analysis.
abstract: A novel automatic stepwise injection headspace single-drop micro-extraction system is proposed as a versatile approach for automated determination of volatile compounds. The system application is demonstrated for ammonia determination in concrete samples. An ammonia gas was produced from ammonium ions and extracted on-line into 5 μL 0.1M H3PO4 to eliminate the interference effect of concrete species on the ammonia stepwise injection spectrophotometric determination. The linear range was 0.1-1 mg kg(-1) with LOD 30 µg kg(-1). The sample throughput was 4 h(-1). This system has been successfully applied for the determination of ammonia in concretes.
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, pr. Universitetskij 26, Saint Petersburg 198504, Russia.
authors.forename: Irina
authors.initials: I
authors.lastname: Timofeeva
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, pr. Universitetskij 26, Saint Petersburg 198504, Russia.
authors.forename: Ilnur
authors.initials: I
authors.lastname: Khubaibullin
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, pr. Universitetskij 26, Saint Petersburg 198504, Russia.
authors.forename: Mihail
authors.initials: M
authors.lastname: Kamencev
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, pr. Universitetskij 26, Saint Petersburg 198504, Russia.
authors.forename: Aleksey
authors.initials: A
authors.lastname: Moskvin
authors.affiliation: Institute of Chemistry, Saint Petersburg State University, pr. Universitetskij 26, Saint Petersburg 198504, Russia. Electronic address: bulatov_andrey@mail.ru.
authors.forename: Andrey
authors.initials: A
authors.lastname: Bulatov
mesh_terms: D000641:Ammonia / Q000032:analysis*; D003252:Construction Materials / Q000032:analysis*; D004867:Equipment Design; D017022:Flow Injection Analysis / Q000295:instrumentation; D057230:Limit of Detection; D059627:Liquid Phase Microextraction / Q000295:instrumentation*; D013053:Spectrophotometry / Q000295:instrumentation*
chemical_list: D000641:Ammonia
keywords: Ammonia; Concrete; Headspace single-drop micro-extraction; Stepwise injection analysis