title: Automated method for simultaneous lead and strontium isotopic analysis applied to rainwater samples and airborne particulate filters (PM10).
abstract: A new automated, sensitive, and fast system for the simultaneous online isolation and preconcentration of lead and strontium by sorption on a microcolumn packed with Sr-resin using an inductively coupled plasma mass spectrometry (ICP-MS) detector was developed, hyphenating lab-on-valve (LOV) and multisyringe flow injection analysis (MSFIA). Pb and Sr are directly retained on the sorbent column and eluted with a solution of 0.05 mol L(-1) ammonium oxalate. The detection limits achieved were 0.04 ng for lead and 0.03 ng for strontium. Mass calibration curves were used since the proposed system allows the use of different sample volumes for preconcentration. Mass linear working ranges were between 0.13 and 50 ng and 0.1 and 50 ng for lead and strontium, respectively. The repeatability of the method, expressed as RSD, was 2.1% and 2.7% for Pb and Sr, respectively. Environmental samples such as rainwater and airborne particulate (PM10) filters as well as a certified reference material SLRS-4 (river water) were satisfactorily analyzed obtaining recoveries between 90 and 110% for both elements. The main features of the LOV-MSFIA-ICP-MS system proposed are the capability to renew solid phase extraction at will in a fully automated way, the remarkable stability of the column which can be reused up to 160 times, and the potential to perform isotopic analysis.
authors.affiliation: Renewable Energy and Environmental Protection Department, Advanced Materials Research Center (CIMAV) S.C. , Miguel de Cervantes 120, Chihuahua, Chih. 31109, Mexico.
authors.forename: Blanca
authors.initials: B
authors.lastname: Beltrán
authors.forename: Jessica
authors.initials: J
authors.lastname: Avivar
authors.forename: Montserrat
authors.initials: M
authors.lastname: Mola
authors.forename: Laura
authors.initials: L
authors.lastname: Ferrer
authors.forename: Víctor
authors.initials: V
authors.lastname: Cerdà
authors.forename: Luz O
authors.initials: LO
authors.lastname: Leal
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001330:Electronic Data Processing / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods*; D017022:Flow Injection Analysis / Q000379:methods; D007554:Isotopes / Q000032:analysis; D007854:Lead / Q000032:analysis*; D013058:Mass Spectrometry; D009862:Online Systems / Q000295:instrumentation; D011891:Rain / Q000737:chemistry; D015203:Reproducibility of Results; D052616:Solid Phase Extraction / Q000379:methods; D013324:Strontium / Q000032:analysis*; D013325:Strontium Isotopes / Q000032:analysis
chemical_list: D000393:Air Pollutants; D007554:Isotopes; D013325:Strontium Isotopes; D007854:Lead; D013324:Strontium