Size exclusion (radio) chromatography of aqueous humic acid solutions with cesium and strontium

Rajec, P.; Gerhart, P.; Macášek, F.; Shaban, I. S.; Bartoš, P.

doi:10.1007/bf02347287

Cited by 13 publications

(4 citation statements)

References 15 publications

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“…This also supports our earlier observation that soluble microbial products are formed in the nitrifying waters [41,42] The much higher UV 254 response for DOC in the HAW sample compared to the MRW sample is consistent with the much higher SUVA 254 measured for the former sample. The AMW profiles suggest that NOM in HAW was comprised of much higher MW components (2-10 kDa) [43] than NOM in MRW (1-3 kDa) and clearly show that there is a substantial difference in the character of these two NOM types. Further increased initial copper concentration up to 1 mg/L started binding with the coagulable fraction.…”

Section: Water Quality Characteristics Of the Water Samplesmentioning

confidence: 85%

Impact of NOM character on copper adsorption by trace ferric hydroxide from iron corrosion in water supply system

Zhan

Sathasivan

Joll

et al. 2012

Chemical Engineering Journal

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The fate of trace concentrations of cupric sulphate (< 0.4 mg/L) dosed into chloraminated distribution systems to inhibit nitrification has been shown in this study to be controlled by at least two crucial factors: the character of natural organic matter (NOM) and iron hydroxide corrosion products present at low concentrations (< 2 mg/L). This research quantified the removal of Cu(II) ions added into waters containing trace Fe(OH) 3 flocs and the effect of NOM of different character on this removal. The dominant dissolved copper species in NOM-containing waters were found to be Cu(II)-NOM complexes.Both intramolecular chelation and intermolecular complexation can occur, with the latter occurring preferentially and resulting in the aggregation of smaller organic molecules to form larger molecules.The presence of ferric hydroxide flocs when Cu(II) ions were added into NOM-containing waters was shown to result in removal of Cu(II) ions, presumably as Cu(II)-NOM complexes. This removal was through adsorption processes obeying Freundlich isotherms, although the presence of larger NOM molecules and heterogeneous copper species (e.g. Cu(OH) 2(s) and CuO (s) ) appeared to shield smaller Cu(II)-NOM complexes from adsorption to some extent. For the strategy of inhibition of nitrification in distribution systems by the addition of Cu(II) ions, complexation of Cu(II) ions by NOM and adsorption of Cu(II)-NOM complexes by ferric hydroxide flocs released from pipe walls pose significant operational challenges to maintaining the concentration of Cu(II) ions through the distribution system.

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Section: Water Quality Characteristics Of the Water Samplesmentioning

confidence: 85%

Impact of NOM character on copper adsorption by trace ferric hydroxide from iron corrosion in water supply system

Zhan

Sathasivan

Joll

et al. 2012

Chemical Engineering Journal

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“…196 However, this has been attempted for uranyl ions, 197^200 for americium(III) and for curium(III). 201 The interactions between humic acid and the radioactive ¢ssion elements caesium and strontium 202 have also been investigated.…”

Section: Solution Chemistrymentioning

confidence: 99%

27 Radiochemistry

Urch¹

2000

Annu. Rep. Prog. Chem., Sect. A

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“…The size-exclusion chromatography (SEC) technique has been proved to be probably the most suitable technique for the determination of molecular weight of humic substances and speciation of metals between fractions of HAs (Kipton et al, 1996;Rajec et al, 1999;Sadi et al, 2002;Newton et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

Lyubomirova

Djingova

2011

Chemical Speciation & Bioavailability

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The formation of PGE -humic acid (HA) complexes in soil and street dust samples was investigated. In order to assess the distribution of Pt and Pd among molecular weight fractions of humic substances, the HA extracts (extracted by 0.1 mol L À 1 sodium pyrophosphate) were analysed by size exclusion chromatography coupled on-line with UV-Vis detection. Similar chromatograms were obtained for soils and street dust samples (254 nm, 280 nm) and two size fractions were operationally defined as high (1600 -5000 Da) and low molecular (51600 Da) HA fractions. The concentration of Pt and Pd in the separated extracts was determined by ICP-MS. The results indicate that up to 43% of Pt is in the high molecular and up to 52% in the low molecular HA fraction. In both type of soil samples, Pd is preferentially bound to the low molecular HA fraction. Dependence of Pd -HA and Pt -HA formation on the sample type both in the soils and in the street dust sample as well as on Pt oxidation state was established. Metallic Pt shows a tendency for complexation with the fractions of HA higher than 5 000 Da. In the street dust samples, the distribution of Pt and Pd is similar and is strongly dependent on the sample type, being bound mainly to the fractions: higher than 5 000 Da, 1600 -5000 Da and the fraction lower than 1600 Da.

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Size exclusion (radio) chromatography of aqueous humic acid solutions with cesium and strontium

Cited by 13 publications

References 15 publications

Impact of NOM character on copper adsorption by trace ferric hydroxide from iron corrosion in water supply system

Impact of NOM character on copper adsorption by trace ferric hydroxide from iron corrosion in water supply system

27 Radiochemistry

Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

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