𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Determination of chromium in different oxidation states by selective on-line preconcentration on cellulose sorbents and flow-injection flame atomic absorption spectrometry

✍ Scribed by Abdulmagid M. Naghmush; Krystyna Pyrzyńska; Marek Trojanowicz

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
696 KB
Volume
288
Category
Article
ISSN
0003-2670

No coin nor oath required. For personal study only.

✦ Synopsis

For on-line preconcentration of Cr(III) and Cr(VI), several functionalized cellulose sorbents, a chelating resin and conventional ion-exchange resins were examined. Cellulose with phosphonic acid exchange groups was found to be superior for the preconcentration of Cr(III), but a cellulose derivative with quaternary amine groups for the preconcentration of Cr(VI). The effects of most common cations and anions present in natural waters on the sorption of both chromium forms was examined. In the optimized flow-injection manifold for a 50-ml aspirated sample volume the detection limits were calculated to be 0.78 and 1.4/~g l-1 for Cr(III) and Cr(VI), respectively. Preliminary results of the application of the developed method to the determination of chromium speciation in natural water samples are presented.

📜 SIMILAR VOLUMES

Copper determination by flow injection o
Copper determination by flow injection on-line sorbent preconcentration coupled with flame atomic absorption spectrometry using 1,10 phenanthroline
✍ Akbar Ali; Hong Shen; Xue Gu; Guangming Xu; Yingxue Ye; Xuefeng Yin 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 144 KB 👁 2 views

1,10 Phenanthroline (phen) has been tested as a complexing agent, which is more stable and selective than sodium-diethyldithiocarbamate (DDTC) and ammonium-pyrrolidinedithiocarbamate (APDC), for on-line preconcentration of copper on RP-C 18 material in a microcolumn with a flow injection-flame atomi

On-line preconcentration and determinati
On-line preconcentration and determination of trace platinum by flow-injection atomic absorption spectrometry
✍ A. Cantarero; M.M. Gómez; C. Cámara; M.A. Palacios 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 584 KB

The analytical performance of a platinum preconcentration method using a 0.01 M HNO, carrier solution and an alumina microcolumn is discussed. On-line preconcentration is followed by flame atomic absorption spectrometry (FAAS), and off-line preconcentration by graphite furnace atomic absorption spec

Determination of trace amounts of lead b
Determination of trace amounts of lead by chelating ion exchange and on-line preconcentration in flow-injection atomic absorption spectrometry
✍ Rajesh Purohit; Surekha Devi 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 552 KB

Resins synthesized from qumohn-b-01 and resorcmol or hydroqmnone, with furfuraldehyde, formaldehyde or benzaldehyde as cross-hnkmg agent, were used for the preconcentrafion of nanogram amounts of lead The rate of exchange and activation energy of lead exchange were calculated Column separations of l

Determination of copper in water and ric
Determination of copper in water and rice samples by flame atomic absorption spectrometry with flow-injection on-line adsorption preconcentration using a knotted reactor
✍ Hengwu Chen; Shukun Xu; Zhaolun Fang 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 756 KB

A flow-injection on-I& adsorption precontentration flame atomic absorption spectrometric system for the detenninatian of copper was developed. The copper d~eth~ldith~~arba~ate chefate was adsorbed on the walls of a PTFE knotted reactor. The sorbed species was eluted by isobutyl methyl ketone at a fl

Determination of cadmium, copper and lea
Determination of cadmium, copper and lead in environmental samples. An evaluation of flow injection on-line sorbent extraction for flame atomic absorption spectrometry
✍ Renli Ma; Willy Van Mol; Freddy Adams 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 998 KB

A flow injection on-line sorbent extraction system was studied in conjunction with flame atomic absorption spectrometry to determine cadmium, copper and lead in digest solutions of solid environmental samples using octadecyl functional groups (C,,) bonded silica gel as sorbent with diethylammonium-Z

Flow-injection on-line fibre column sepa
Flow-injection on-line fibre column separation and preconcentration system for efficient determination of trace gold in ores and metallurgical samples by flame atomic absorption spectrometry
✍ Weiji Qi; Xing Wu; Chun Zhou; Haizhou Wu; Yingqi Gao 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 507 KB

A flow-injection on-line 8531 fibre column separation and preconcentration system is proposed for the efficient flame atomic absorption spectrometric determination of trace gold in ores and metallurgical samples. A flow manifold with a pump and two valves was assembled to conduct the operating cycle