|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 16 van 28 gevonden artikelen
| Titel: |
Factorial design for optimization of flow-injection preconcentration procedure for copper(II) determination in natural waters, using 2-aminomethylpyridine grafted silica gel as adsorbent and spectrophotometric detection |
| Auteur: |
Brasil, Jorge L. Martins, Lucas C. Ev, Ricardo R. Dupont, Jairton Dias, Sivio L. P. Sales, Jose A. A. Airoldi, Claudio Lima, Eder C. |
| Verschenen in: |
International journal of environmental analytical chemistry |
| Paginering: | Jaargang 85 (2005) nr. 7 pagina's 475-491 |
| Jaar: |
2005-06-15 |
| Inhoud: |
The 2-aminomethylpyridine anchored silica gel (AMPSG) was successfully used as a sorbent in a simple spectrophotometric flow system for Cu2+ preconcentration in natural water samples, using sodium diethyldithiocarbamate as chromogenic agent (460 nm). The system was optimized using a full factorial design 25 to determine better analytical conditions to determine copper in the natural water samples such as those from river, tap, stream, spring, well, waste, synthetic brackish water and a water reference material (NIST-1640). The better conditions used were: 180 s loading; 30 s elution; 30 s regeneration of the column; loading flow rate 6.6 mL min-1; buffer solution for the preconcentration and regeneration of the column-acetate buffer pH 5.75; elution flow rate 1.6 mL min-1; eluent composition 0.20 mol L-1 HNO3. Under these conditions, the preconcentration factor obtained was 77, and the detection limit achieved was 3.0 ng mL-1. The recovery of spiked water samples ranged from 95.2 to 104.7%. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 16 van 28 gevonden artikelen
| << vorige | volgende >> |