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Development of a passive sampler based on a polymer inclusion membrane for total ammonia monitoring in freshwaters.
Almeida, M Inês G S; Silva, Adélia M L; Coleman, Rhys A; Pettigrove, Vincent J; Cattrall, Robert W; Kolev, Spas D.
Afiliação
  • Almeida MI; Centre for Aquatic Pollution Identification and Management (CAPIM), School of Chemistry, The University of Melbourne, Melbourne, Victoria, 3010, Australia.
  • Silva AM; Pontifícia Universidade Católica de Goiás, Coordenação de Química, Escola de Ciências Exatas e da Computação, 74605-010, Goiânia, GO, Brazil.
  • Coleman RA; Melbourne Water Corporation, Docklands, Melbourne, Victoria, 3008, Australia.
  • Pettigrove VJ; Melbourne Water Corporation, Docklands, Melbourne, Victoria, 3008, Australia.
  • Cattrall RW; Centre for Aquatic Pollution Identification and Management (CAPIM), School of Biosciences, The University of Melbourne, Melbourne, Victoria, 3010, Australia.
  • Kolev SD; Centre for Aquatic Pollution Identification and Management (CAPIM), School of Chemistry, The University of Melbourne, Melbourne, Victoria, 3010, Australia.
Anal Bioanal Chem ; 408(12): 3213-22, 2016 May.
Article em En | MEDLINE | ID: mdl-26873214
A passive sampler for determining the time-weighted average total ammonia (i.e. molecular ammonia and the ammonium cation) concentration (C TWA) in freshwaters, which incorporated a polymer inclusion membrane (PIM) as a semi-permeable barrier separating the aqueous source solution from the receiving solution (i.e. 0.8 mol L(-1) HCl), was developed for the first time. The PIM was composed of dinonylnaphthalene sulfonic acid (DNNS) as a carrier, poly (vinyl chloride) (PVC) as a base polymer and 1-tetradecanol as a modifier. Its optimal composition was found to be 35 wt% commercial DNNS, 55 wt% PVC and 10 wt% 1-tetradecanol. The effect of environmental variables such as the water matrix, pH and temperature were also studied using synthetic freshwaters. The passive sampler was calibrated under laboratory conditions using synthetic freshwaters and exhibited a linear response within the concentration range 0.59-2.8 mg L(-1) NH4(+) (0.46-2.1 mg N L(-1)) at 20 °C. The performance of the sampler was further investigated under field conditions over 7 days. A strong correlation between spot sampling and passive sampling was achieved, thus providing a proof-of-concept for the passive sampler for reliably measuring the C(TWA) of total ammonia in freshwaters, which can be used as an indicator in tracking sources of faecal contamination in stormwater drains.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Polímeros / Monitoramento Ambiental / Água Doce / Amônia / Membranas Artificiais Idioma: En Revista: Anal Bioanal Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Austrália

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Polímeros / Monitoramento Ambiental / Água Doce / Amônia / Membranas Artificiais Idioma: En Revista: Anal Bioanal Chem Ano de publicação: 2016 Tipo de documento: Article País de afiliação: Austrália