On-line process monitoring of water-soluble ions in pulp and paper machine waters by capillary electrophoresis

Raimo Kokkonen, Heli Sirén (Corresponding Author), Seppo Kauliomäki, Stella Rovio, Kaija Luomanperä

Research output: Contribution to journalArticleScientificpeer-review

28 Citations (Scopus)

Abstract

In this study, capillary electrophoresis (CE) was used for separation of inorganic and organic ions from waters of paper and paperboard machines at mills. The instrument was constructed for on-line measurements by building a batch-type sample feeding unit. Chloride, thiosulphate, sulphate, oxalate, sulphite, hydrogen sulphide, formate, carbonate, phosphate and acetate in the process water samples were separated using an ion-specific separation system in CE with dicarboxylic acid buffer (pH 8.2), with pyridinium-2,3-dicarboxylic acid modified with commercial NICE-Pak OFM-OH solution (pH 12.0) or with a cetyltrimethylammonium bromide solution modified with chromate (pH 10.6). In addition, Analis CEofix Anions 8 electrolyte solution was tested in on-line studies at mills. It allowed 5 min separation time for the anions. Aluminium was determined at pH 3.6 in 10 min by using a laboratory-made imidazole buffer modified with 18-crown 6-ether. The developed CE systems were used to monitor the concentrations of sulphur species in dithionite degradation, to estimate corrosion degree in the water tanks, to monitor formaldehyde as the biocide chemical in wire washing and, in general, to observe process disturbances resulting from chemical feedings and their sites. The CE combination was on-line coupled to eight different process machines for continuous monitoring of concentrations for periods between two weeks and one month at paper and pulp mills in Finland.
Original languageEnglish
Pages (from-to)243-252
JournalJournal of Chromatography A
Volume1032
Issue number1-2
DOIs
Publication statusPublished - 2004
MoE publication typeA1 Journal article-refereed

Fingerprint

Capillary electrophoresis
Process monitoring
Capillary Electrophoresis
Pulp
Ions
Dicarboxylic Acids
formic acid
Water
Anions
Buffers
Crown Ethers
Dithionite
Chromates
Thiosulfates
Hydrogen Sulfide
Sulfites
Water tanks
Paperboards
Corrosion
Oxalates

Keywords

  • process monitoring
  • water analysis
  • paper
  • inorganic anions
  • organic acids

Cite this

Kokkonen, Raimo ; Sirén, Heli ; Kauliomäki, Seppo ; Rovio, Stella ; Luomanperä, Kaija. / On-line process monitoring of water-soluble ions in pulp and paper machine waters by capillary electrophoresis. In: Journal of Chromatography A. 2004 ; Vol. 1032, No. 1-2. pp. 243-252.
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On-line process monitoring of water-soluble ions in pulp and paper machine waters by capillary electrophoresis. / Kokkonen, Raimo; Sirén, Heli (Corresponding Author); Kauliomäki, Seppo; Rovio, Stella; Luomanperä, Kaija.

In: Journal of Chromatography A, Vol. 1032, No. 1-2, 2004, p. 243-252.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - On-line process monitoring of water-soluble ions in pulp and paper machine waters by capillary electrophoresis

AU - Kokkonen, Raimo

AU - Sirén, Heli

AU - Kauliomäki, Seppo

AU - Rovio, Stella

AU - Luomanperä, Kaija

PY - 2004

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N2 - In this study, capillary electrophoresis (CE) was used for separation of inorganic and organic ions from waters of paper and paperboard machines at mills. The instrument was constructed for on-line measurements by building a batch-type sample feeding unit. Chloride, thiosulphate, sulphate, oxalate, sulphite, hydrogen sulphide, formate, carbonate, phosphate and acetate in the process water samples were separated using an ion-specific separation system in CE with dicarboxylic acid buffer (pH 8.2), with pyridinium-2,3-dicarboxylic acid modified with commercial NICE-Pak OFM-OH solution (pH 12.0) or with a cetyltrimethylammonium bromide solution modified with chromate (pH 10.6). In addition, Analis CEofix Anions 8 electrolyte solution was tested in on-line studies at mills. It allowed 5 min separation time for the anions. Aluminium was determined at pH 3.6 in 10 min by using a laboratory-made imidazole buffer modified with 18-crown 6-ether. The developed CE systems were used to monitor the concentrations of sulphur species in dithionite degradation, to estimate corrosion degree in the water tanks, to monitor formaldehyde as the biocide chemical in wire washing and, in general, to observe process disturbances resulting from chemical feedings and their sites. The CE combination was on-line coupled to eight different process machines for continuous monitoring of concentrations for periods between two weeks and one month at paper and pulp mills in Finland.

AB - In this study, capillary electrophoresis (CE) was used for separation of inorganic and organic ions from waters of paper and paperboard machines at mills. The instrument was constructed for on-line measurements by building a batch-type sample feeding unit. Chloride, thiosulphate, sulphate, oxalate, sulphite, hydrogen sulphide, formate, carbonate, phosphate and acetate in the process water samples were separated using an ion-specific separation system in CE with dicarboxylic acid buffer (pH 8.2), with pyridinium-2,3-dicarboxylic acid modified with commercial NICE-Pak OFM-OH solution (pH 12.0) or with a cetyltrimethylammonium bromide solution modified with chromate (pH 10.6). In addition, Analis CEofix Anions 8 electrolyte solution was tested in on-line studies at mills. It allowed 5 min separation time for the anions. Aluminium was determined at pH 3.6 in 10 min by using a laboratory-made imidazole buffer modified with 18-crown 6-ether. The developed CE systems were used to monitor the concentrations of sulphur species in dithionite degradation, to estimate corrosion degree in the water tanks, to monitor formaldehyde as the biocide chemical in wire washing and, in general, to observe process disturbances resulting from chemical feedings and their sites. The CE combination was on-line coupled to eight different process machines for continuous monitoring of concentrations for periods between two weeks and one month at paper and pulp mills in Finland.

KW - process monitoring

KW - water analysis

KW - paper

KW - inorganic anions

KW - organic acids

U2 - 10.1016/j.chroma.2003.09.033

DO - 10.1016/j.chroma.2003.09.033

M3 - Article

VL - 1032

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JO - Journal of Chromatography A

JF - Journal of Chromatography A

SN - 0021-9673

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ER -