On-line preconcentration of chromium(III) and speciation of chromium in waters by flame atomic absorption spectrometry

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

The chemistry of complexation has been investigated and conditions optimized for on-line preconcentration of Cr-III by resins with immobilized quinolin-8-ol or iminodiacetate functional groups. When solutions were buffered to 0.1 mol l(-1) acetate at pH 9, the detection limit of Cr-III was 6 ng ml(-1) for preconcentration on the quinolin-8-ol resin at 6 ml min(-1) for 3 min. With the iminodiacetate resin (Muromac A-1), the optimum buffer conditions were 0.1 mol l(-1) acetate at pH 4, which gave a Cr-III detection limit of 2 ng ml(-1) (3 min preconcentration at 6 ml min(-1)). The major ions in sea-water did not interfere with preconcentration of 100 ng ml(-1) Cr-III by Muromac A-1. However, suppressive interferences were caused by 100 mu g ml(-1) of Ca2+ or Fe2+ with the quinolin-8-ol resin. Despite having similar log stability constants of complexation with either resin, the interference caused by Ca2+ was much greater than that by Mg2+. Muromac A-1 was used for preconcentration of Cr-III in estuarine- and sea-waters, prior to determination by flame atomic absorption spectrometry (FAAS). By reduction of Cr-VI to Cr-III, it was also possible to determine the total concentration of ionic Cr in the waters, which allowed calculation of the Cr-VI concentration by difference. The Cr-III concentration in the samples from the Clyde estuary were 3-8 ng ml(-1), with the Cr-VI concentration about 0.7 ng ml(-1). Only Cr-III (3 ng ml(-1)) was found in the sea-water samples from the Cumbrian Coast.

LanguageEnglish
Pages241-246
Number of pages6
JournalJournal of Analytical Atomic Spectrometry
Volume10
Issue number3
DOIs
Publication statusPublished - Mar 1995

Fingerprint

Atomic absorption spectrometry
Chromium
Resins
Water
Complexation
Acetates
Estuaries
Functional groups
Coastal zones
Buffers
Ions
chromium hexavalent ion

Keywords

  • Cumbrian Coast
  • Clyde estuary
  • chromium(III)

Cite this

@article{899f710ea2944c04a4ff79da98c49013,
title = "On-line preconcentration of chromium(III) and speciation of chromium in waters by flame atomic absorption spectrometry",
abstract = "The chemistry of complexation has been investigated and conditions optimized for on-line preconcentration of Cr-III by resins with immobilized quinolin-8-ol or iminodiacetate functional groups. When solutions were buffered to 0.1 mol l(-1) acetate at pH 9, the detection limit of Cr-III was 6 ng ml(-1) for preconcentration on the quinolin-8-ol resin at 6 ml min(-1) for 3 min. With the iminodiacetate resin (Muromac A-1), the optimum buffer conditions were 0.1 mol l(-1) acetate at pH 4, which gave a Cr-III detection limit of 2 ng ml(-1) (3 min preconcentration at 6 ml min(-1)). The major ions in sea-water did not interfere with preconcentration of 100 ng ml(-1) Cr-III by Muromac A-1. However, suppressive interferences were caused by 100 mu g ml(-1) of Ca2+ or Fe2+ with the quinolin-8-ol resin. Despite having similar log stability constants of complexation with either resin, the interference caused by Ca2+ was much greater than that by Mg2+. Muromac A-1 was used for preconcentration of Cr-III in estuarine- and sea-waters, prior to determination by flame atomic absorption spectrometry (FAAS). By reduction of Cr-VI to Cr-III, it was also possible to determine the total concentration of ionic Cr in the waters, which allowed calculation of the Cr-VI concentration by difference. The Cr-III concentration in the samples from the Clyde estuary were 3-8 ng ml(-1), with the Cr-VI concentration about 0.7 ng ml(-1). Only Cr-III (3 ng ml(-1)) was found in the sea-water samples from the Cumbrian Coast.",
keywords = "Cumbrian Coast, Clyde estuary, chromium(III)",
author = "Benyamin Pasullean and Davidson, {Christine M.} and David Littlejohn",
year = "1995",
month = "3",
doi = "10.1039/JA9951000241",
language = "English",
volume = "10",
pages = "241--246",
journal = "Journal of Analytical Atomic Spectrometry",
issn = "0267-9477",
number = "3",

}

TY - JOUR

T1 - On-line preconcentration of chromium(III) and speciation of chromium in waters by flame atomic absorption spectrometry

AU - Pasullean , Benyamin

AU - Davidson, Christine M.

AU - Littlejohn, David

PY - 1995/3

Y1 - 1995/3

N2 - The chemistry of complexation has been investigated and conditions optimized for on-line preconcentration of Cr-III by resins with immobilized quinolin-8-ol or iminodiacetate functional groups. When solutions were buffered to 0.1 mol l(-1) acetate at pH 9, the detection limit of Cr-III was 6 ng ml(-1) for preconcentration on the quinolin-8-ol resin at 6 ml min(-1) for 3 min. With the iminodiacetate resin (Muromac A-1), the optimum buffer conditions were 0.1 mol l(-1) acetate at pH 4, which gave a Cr-III detection limit of 2 ng ml(-1) (3 min preconcentration at 6 ml min(-1)). The major ions in sea-water did not interfere with preconcentration of 100 ng ml(-1) Cr-III by Muromac A-1. However, suppressive interferences were caused by 100 mu g ml(-1) of Ca2+ or Fe2+ with the quinolin-8-ol resin. Despite having similar log stability constants of complexation with either resin, the interference caused by Ca2+ was much greater than that by Mg2+. Muromac A-1 was used for preconcentration of Cr-III in estuarine- and sea-waters, prior to determination by flame atomic absorption spectrometry (FAAS). By reduction of Cr-VI to Cr-III, it was also possible to determine the total concentration of ionic Cr in the waters, which allowed calculation of the Cr-VI concentration by difference. The Cr-III concentration in the samples from the Clyde estuary were 3-8 ng ml(-1), with the Cr-VI concentration about 0.7 ng ml(-1). Only Cr-III (3 ng ml(-1)) was found in the sea-water samples from the Cumbrian Coast.

AB - The chemistry of complexation has been investigated and conditions optimized for on-line preconcentration of Cr-III by resins with immobilized quinolin-8-ol or iminodiacetate functional groups. When solutions were buffered to 0.1 mol l(-1) acetate at pH 9, the detection limit of Cr-III was 6 ng ml(-1) for preconcentration on the quinolin-8-ol resin at 6 ml min(-1) for 3 min. With the iminodiacetate resin (Muromac A-1), the optimum buffer conditions were 0.1 mol l(-1) acetate at pH 4, which gave a Cr-III detection limit of 2 ng ml(-1) (3 min preconcentration at 6 ml min(-1)). The major ions in sea-water did not interfere with preconcentration of 100 ng ml(-1) Cr-III by Muromac A-1. However, suppressive interferences were caused by 100 mu g ml(-1) of Ca2+ or Fe2+ with the quinolin-8-ol resin. Despite having similar log stability constants of complexation with either resin, the interference caused by Ca2+ was much greater than that by Mg2+. Muromac A-1 was used for preconcentration of Cr-III in estuarine- and sea-waters, prior to determination by flame atomic absorption spectrometry (FAAS). By reduction of Cr-VI to Cr-III, it was also possible to determine the total concentration of ionic Cr in the waters, which allowed calculation of the Cr-VI concentration by difference. The Cr-III concentration in the samples from the Clyde estuary were 3-8 ng ml(-1), with the Cr-VI concentration about 0.7 ng ml(-1). Only Cr-III (3 ng ml(-1)) was found in the sea-water samples from the Cumbrian Coast.

KW - Cumbrian Coast

KW - Clyde estuary

KW - chromium(III)

U2 - 10.1039/JA9951000241

DO - 10.1039/JA9951000241

M3 - Article

VL - 10

SP - 241

EP - 246

JO - Journal of Analytical Atomic Spectrometry

T2 - Journal of Analytical Atomic Spectrometry

JF - Journal of Analytical Atomic Spectrometry

SN - 0267-9477

IS - 3

ER -