Transition metals in atmospheric aqueous samples, analytical determination and speciation

Hofmann, H.; Hoffmann, P.; Lieser, Κ. H.

doi:10.1007/bf00322435

Cited by 65 publications

(42 citation statements)

References 9 publications

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“…16 The size-distribution pattern of iron in the successive rainfall sample was similar to that of rainwater samples collected in Germany. 9 The molecular fraction contained labile iron and an insignificantly non-labile one. Figure 4 shows the fractionation results of iron and HA in synthetic samples.…”

Section: Fractionation Results Of Natural and Synthetic Rain Water Samentioning

confidence: 97%

“…9 However, the validity of these species has not been discussed based on their concentrations in the natural rain samples. Our catalytic method 3 Figure 5 shows the relationship between the labile iron concentration and the pH in natural and synthetic rain-water samples.…”

Section: Labile Iron In Molecular Fractionmentioning

confidence: 99%

“…The analytical results of natural rain-water samples were compared with those of synthetic samples. The proposed method was simpler than the speciation method 9 based on the sorption separation with four types of ion-exchangers and adsorbents.…”

mentioning

confidence: 99%

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Speciation of Iron in Rain Water by Size Fractionation, Acid Decomposition, Acid Extraction and Catalytic Determination

Kawakubo

Iwatsuki

2000

ANAL. SCI.

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The bioavailability and toxicity of metal species in aquatic systems may depend on the lability, i.e., reactivity, which is different depending on their chemical forms 1,2 Especially, the association of iron with coexisting humic substances (HSs) changes the lability of iron. 3 The aggregation of iron and HSs probably influences the lability of other trace constituents by their association with iron-HSs aggregates. 4,5 Therefore, the speciation of labile and non-labile iron species is important in environmental and biological studies.Iron can be sensitively determined at pH values close to those 6 of natural rain water by a catalytic spectrophotometric method using an iron-catalyzed oxidation reaction of ophenylenediamine (OPDA) with hydrogen peroxide. 3 The determination of iron is based on a measurement of the formation rate of oxidized OPDA in proportion to the concentration of iron forming an active intermediate, probably Fe III (H2O2)(OPDA), in the catalytic reaction process. Such a labile form of iron was well characterized as Fe 3+ and Fe III Li (3-in)+ , where i = 1 or 2 for unidentate and i = 1 for bidentate ligand of L n-, in a study of the reactivity of hydroxo, fluoro and oxalato complexes of iron.3 Therefore, the interpretation of the lability is very simple compared with electrochemical methods, 7,8 which are affected by the complicated adsorption property of the organic matter on a working electrode. In this paper, the catalytic method was combined with the size fractionation and acid decomposition, and was applied to the speciation of labile and non-labile iron in rain water. Acid extraction of the particle fraction was also carried out for the speciation. The analytical results of natural rain-water samples were compared with those of synthetic samples. The proposed method was simpler than the speciation method 9 based on the sorption separation with four types of ion-exchangers and adsorbents. ExperimentalReagents and samples Unless stated otherwise, all chemicals were of analyticalreagent grade. High-purity NaOH and HNO3 solutions (Kanto Chemical Co., Inc., Ultrapur) and de-ionized and distilled water were used throughout. An iron stock standard solution (1.00 g Fe l -1 ) was prepared by dissolving FeNH4(SO4)2·12H2O (purity ≥ 99.0%) in 0.1 M HCl. Working iron standard solutions were prepared just before use by diluting the stock standard solution with water or 1 mM HCl for a spectrophotometric determination or with 0.1 M HCl for an atomic-absorption spectrometric determination. A humic acid (HA) solution was prepared by dissolving the reagent of humic acid (Wako Pure Chemical Industries, Ltd., isolated from soil) in 0.01 M NaOH and was neutralized with 0.2 M HCl.In three rainfall events on 1/19/1999, 1/24/1999 and 9/16/1999, rain water was collected on the roof of a building in Yamanashi University, Kofu, as the initial rainfall water from the beginning to 2 mm of rain precipitation, and as the successive rainfall water between 5 mm and 7 mm. The total precipitations on 1/19/1999, 1/24/1999 an...

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Section: Fractionation Results Of Natural and Synthetic Rain Water Samentioning

confidence: 97%

Section: Labile Iron In Molecular Fractionmentioning

confidence: 99%

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Speciation of Iron in Rain Water by Size Fractionation, Acid Decomposition, Acid Extraction and Catalytic Determination

Kawakubo

Iwatsuki

2000

ANAL. SCI.

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“…Convém ressaltar que estes dados estão associados à direção do vento sudeste, contrariando de certa forma a direção preferencial de nordeste da fonte emissora em relação à fonte receptora ( (2,37), com direções predominantes do quadrante leste/sul e norte/leste, respectivamente, em relação à fonte emissora.…”

Section: Tratamento Estatísticounclassified

Composição química da precipitação atmosférica no sul do Brasil: estudo preliminar

Migliavacca¹,

Teixeira²,

Machado³

et al. 2005

Quím. Nova

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“…AAS, ICP and ICP-AES/MS were reported for the determination of the total iron in the precipitations, but found to be tedious for the field characterization. [11][12][13][14][15][16] Extractive methods are highly sensitive but are generally lacking in simplicity. [17][18][19][20] A chemiluminescence method was proposed for the quantification of iron.…”

Section: Introductionmentioning

confidence: 99%

Polarographic Determination of Total Iron Content Using a Fe2+/3+-Methylthymol Blue-NO2− System

Yang

Wang

et al. 2004

ANAL. SCI.

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Transition metals in atmospheric aqueous samples, analytical determination and speciation

Cited by 65 publications

References 9 publications

Speciation of Iron in Rain Water by Size Fractionation, Acid Decomposition, Acid Extraction and Catalytic Determination

Speciation of Iron in Rain Water by Size Fractionation, Acid Decomposition, Acid Extraction and Catalytic Determination

Composição química da precipitação atmosférica no sul do Brasil: estudo preliminar

Polarographic Determination of Total Iron Content Using a Fe2+/3+-Methylthymol Blue-NO2− System

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