Use of factorial design and Doehlert matrix for multivariate optimisation of an on-line preconcentration system for lead determination by flame atomic absorption spectrometry

Ferreira, S. L. C.; dos Santos, W. N. L.; Bezerra, M. A.; Lemos, V. A.; Bosque-Sendra, J. M.
February 2003
Analytical & Bioanalytical Chemistry;Feb2003, Vol. 375 Issue 3, p443
Academic Journal
A system for on-line preconcentration and determination of lead by flame atomic absorption spectrometry (FAAS) was proposed. It was based on the sorption of lead(II) ions on a minicolumn of polyurethane foam loaded with 2-(2-thiazolylazo)-5-dimethylaminophenol (TAM). The optimisation step was carried out using two-level full factorial and Doehlert designs for the determination of the optimum conditions for lead preconcentration. The proposed procedure allowed the determination of lead with a detection limit of 2.2 μg L-1, and a precision, calculated as relative standard deviation (RSD), of 2.4 and 6.8 for a lead concentration of 50.0 and 10.0 μg L-1, respectively. A preconcentration factor of 45 and a sampling frequency of 27 samples per hour were obtained. The recovery achieved for lead determination in the presence of several cations demonstrated that this procedure has enough selectivity for analysis of environmental samples. The validation was carried out by analysis of certified reference material. This procedure was applied to lead determination in natural food.


Related Articles

  • Portage Precision Polymers.  // Rubber World;Mar2012, Vol. 245 Issue 6, p29 

    The article features Portage Precision Polymers Inc. which specializes in rubber compound development, rubber raw materials, and custom mixing, as well as buys and sells worldwide on all types of synthetic rubber, natural rubber and rubber chemicals.

  • Correction.  // Rubber & Plastics News;1/10/2011, Vol. 40 Issue 12, p2 

    A correction to the article on Portage Precision Polymers Inc. that was published in the December 13, 2011 issue of the journal is presented.

  • Portage Precision back on course with addition. McNulty, Mike // Rubber & Plastics News;6/27/2011, Vol. 40 Issue 24, p0004 

    The article offers information on the business expansion of Portage Precision Polymers Inc., under which a mixing line will be added to pair with the mixing and mill line of the company, and a second line will be needed to meet the needs of the customers.

  • Versatility pays off. Wenger, Rachel // Rubber & Plastics News;7/1/2002, Vol. 31 Issue 24, p4 

    Features the business operation of Portage Precision Polymers Inc. in Ravenna, Ohio. Production and target market; Disclosure on the investment made for the establishment of the company; Management capacity of Doug Hartley as president and chief executive officer of the company.

  • A recipe for success.  // Smart Business Akron/Canton;Feb2014, Vol. 23 Issue 9, p19 

    The article discusses the continuing evolution and growth of the Portage Precision Polymers Inc., a company that develops and produces custom mix elastomer compounds for manufacturing and fabricating businesses, under the leadership of president and chief executive officer Doug Hartley.

  • Quality registrations.  // Rubber World;Sep2014, Vol. 250 Issue 6, p7 

    The article reports on the ISO 9001:2008 with Design designation earned by the North American custom rubber and silicone mixing company Portage Precision Polymers Inc. in 2014.

  • Portages into the past. Kulpa, J. // Field & Stream;Mar1989, Vol. 93 Issue 3, p48 

    Describes traveling along the Brule-St. Croix passage at the west end of Lake Superior in Wisconsin. This trail was once used as a portage trail, or overland route, between Lake Superior and the Mississippi River by early explorers and fur traders in canoes.

  • Development and evaluation of extended release metformin hydrochloride matrix tablets: rate of in-vitro and in-vivo release studies. Sundaramoorthy, K.; Kavimani, S.; Swaminathan, S. // Journal of Pharmacy Research;Mar2011, Vol. 4 Issue 3, p884 

    Monolithic matrix tablets of metformin hydrochloride were formulated as extended release tablets by employing ethyl cellulose polymer and the extended release characterization of the formulated tablets was investigated. Extended release matrix tablets containing 500 mg metformin hydrochloride...

  • PPP doubles capacity with internal mixing line. McNulty, Mike // Rubber & Plastics News;7/23/2012, Vol. 41 Issue 26, p6 

    The article reports that Portage Precision Polymers Inc. has installed a custom internal mixing line at its facility in Ravenna in order to double its capacity.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics