Determination of Cu-Cr-As and Zn in Preserved Wood by Atomic Absorption Spectroscopy

Johanson, Robert E.

doi:10.1515/hfsg.1973.27.4.126

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…The procedure was essentially that described by Johanson (1974) for karri sleeper samples except that the first extraction was heated to ioo°C and held for 16 h at room temperature. Arsenic was determined by atomic absorption spectroscopy (Johanson 1973).…”

Section: Determination Of Arsenicmentioning

confidence: 99%

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Johanson¹

1975

Holzforschung

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Schlüsselwörter (Sachgebiete) Arsenumhüllung Diffusionsbehandlung Saures Holz Schwellen Termiten Karri Arsenical Diffusion Treatment of Eucalyptus diversicolor Rail Sleepers SummaryDiffusion treatment of heartwood of karri (Eucalyptus diversicolor) which is resistant to pressure impregnation was studied to provide rail sleepers with a protective envelope against termites. An alkaline arsenical concentrate, based on arsenic (III) and polyborates, gave an uptake of 4 to 17 mg cm~2 As on incised faces. The boultonising treatment in petroleum oil did not affect loadings between incisions, but in the incised zones there was a decrease of 20 to 50% of the As content.With a new type of incising (called "brucising") the decrease in As content during the oil treatment appears to become negligible. The alkaline influence of arsenic (III) did not extend beyond the first 2 to 3 mm from the surface of the acidic karri, but this shallow penetration resulted in comparatively high loadings. It was not possible to obtain this effect with arsenic (V) concentrate of pH 5.5. The (V) form gave less penetration than arsenic (III) on unincised areas for similar initial surface loadings of both concentrates. In the areas around incisions, the final penetration by arsenic (V) was much better than in unincised regions and initial loadings of as much as 5 kg m~3 As were obtained at depths 15 to 20 mm from the surface. Both forms of arsenic can give very high loadings and adequate penetration if sufficient time for diffusion is allowed. Alternatively, a deep close pattern of surface indentations would ensure deep penetration in the envelope region while diffusion periods of 21 days possibly could be adequate. Arsen-Diffusionsbehandlung von Karri-Schwellen ZusammenfassungDie Difrusionsbehandlung von Karri-Kernholz, das "unter Druck schwer imprägnierbar ist, wurde untersucht, um Schwellen einen Termitenschutz zu geben. Mit alkalischen Arsen-Konzentraten auf der Basis von As (III) und Polyboraten konnte eine Arsenaufnahme von 4 bis 17 mg/cm 2 auf eingeritzten Oberflächen erreicht werden. Im Boulton-Verfahren mit Erdöl behandeltes Holz ergab keine höheren Aufnahmen zwischen den Einstichen, aber in den Einstichzonen verringerte sich der Arsengehalt um 20 bis 50%. Durch eine neue Art des Einstechens (eine "brucising" genannte Kombination von Quetschen und Einstechen) scheint die Abnahme des Arsengehaltes während der Behandlung vernachlässigbar zu sein. Der alkalische Einfluß von As (III) war nicht über die ersten 2 bis 3 mm der sauren KarriholzOberfläche hinaus festzustellen; jedoch führt diese schwache Aufnahme zu vergleichsweise hohen Beladungen. Es war nicht möglich, diesen Effekt mit As(V)-Konzentraten vom pH 5,5 zu bekommen. Bei gleichen Oberflächenauftragsmengen war die Aufnahme von As(V)-Konzentraten niedriger als die von As (III) ohne Einstichbehandlung. Rund um die Einstechzonen war die As(V)-Aufnähme besser als in den nicht eingestochenen Bereichen; es ergaben sich Anfangsaufnahmen von unter 5 kg/m 3 in 15 bis 20 mm Tiefe von der Oberfl...

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Section: Determination Of Arsenicmentioning

confidence: 99%

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Johanson¹

1975

Holzforschung

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“…The reagents, the standard CCA-Zn stock solution and the AAS analysis procedure of test solutions were those described (Johanson 1973). …”

Section: Experimental (I) the Instrument And Reagentsmentioning

confidence: 99%

“…The procedure previously described for the determination of copper, chromium, arsenic and zinc in CCA-Zn preserved wood (Johanson 1973) is based on oxidativeextraction with dilute HC1. Although the method enables accurate and rapid determination of the metals by atomic absorption spectroscopy (AAS), in some situations organic extractives may interfere and cast doubt on the values.…”

Section: Introductionmentioning

confidence: 99%

“…However, the presence of acid sulphate produces serious errors in the determination of metals by AAS (Johanson 1973;Barnett 1972;Hurlbut and Chriswell 1971;Christian and Feldman 1970;Maruta et al 1970;Lambert 1969; RamaBrought to you by | University of Arizona Authenticated Download Date | 5/29/15 12:26 AM ιιδ R. Johanson Holzforschung krishna et al 1967), and therefore H 2 SO 4 digestions have been avoided. The present study has been undertaken to see whether small amounts of H 2 SO 4 could provide adequate digestion whilst limiting interference in AAS to a tolerable level.…”

Section: Introductionmentioning

confidence: 99%

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Determination of Cu-Cr-As and Zn in H₂SO₄/HNO₃digested extracts of preserved wood by atomic absorption spectroscopy with reference to As in Karri rail sleepers

Johanson¹

1974

Holzforschung

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Schlüsselwörter(Sachgebiete) CKA-Bestimmung Cu-Cr-As-Zn Schweljen Atomabsorptionsspektroskopie HCl-Extrakte Aufschluß mit H 2 SO,/ HN0 3 Eucalyptus regnans Eucalyptus diversicolor Pinus radiataDetermination of Cu-Cr-As and Zn in H 2 SO,/HNO 3 digested extracts of preserved wood by atomicabsorption spectroscopy with reference to As in Karri rail sleepers SummaryThe determination of Cu-Cr-As (CCA) and Zn was made by atomic absorption spectroscopy (AAS). Solutions were prepared by extracting metals from preserved Eucalyptus and pine with dilute HC1 and organic extractives destroyed by H 2 SO 4 /HNO 3 and H 2 O 2 digestion. After expulsion of HNO 3 only a small residue of cone. H 2 SO 4 remained. This produced slight interference and the values determined for the elements were lower by 2 to 5% compared with those for undigested extracts. The digestion method was applied to the determination of arsenic in commercially treated karri (Eucalyptus diversicolor) rail sleeper and the arsenic values were compared with those obtained for undigested extracts by using standard Cu-Cr-As-Zn controls. The results obtained by both methods were comparable although the digestion method consistently produced slightly lower values. The digestion method thus provides a valuable check where the possible interterence of organic matter in extracts throws doubt on the results. Addition of Na 2 SO 4 to suppress H 2 SO 4 interference gave inconsistent results as some As values were enhanced and others depressed. When extracts from untreated karri were used as blanks, inferior results were obtained.Die Bestimmung von Cu-Cr-As und Zn in H 2 SO.,/HNO 3 Aufschluß-Extrakten aus geschütztem Holz durch Atomabsorptionsspektroskopie mit besonderer Berück-sichtigung des As in Karri-Schwellen Zusammenfassung Die Bestimmung von Cu-Cr-As (CKA) und Zn wurde mit Hilfe der Atomabsorptionsspektroskopie durchgeführt. Die Lösungen wurden durch Extraktion der Elemente aus geschütztem Eukalyptus-und Kiefernholz mit verdünnter HC1 gewonnen, nachdem die organischen Extraktstoffe durch Aufschluß mit H 2 SO 4 /HNO 3 und H 2 O 2 zerstört waren. Nach Vertreibung der HNO 3 verblieb nur ein kleiner Rückstand von konz. H 2 SO 4 . Letztere zeigte schwache Interferenz und die für die Elemente bestimmten Werte lagen um 2-5% niedriger als diejenigen aus nicht aufgeschlossenen Extrakten. Die Aufschlußmethode wurde zur Bestimmung von Arsen in getränkten Karri-Schwellen angewendet; die erhaltenen As-Werte wurden mit denjenigen aus nicht aufgeschlossenen Extrakten mit Hilfe der Standard-Cu-Cr-As-Zn-Kontrollen verglichen. Die mit beiden Methoden ermittelten Werte waren vergleichbar, obwohl die Aufschluß-Methode etwas niedrigere Werte ergab; sie liefert eine wertvolle Kontrolle, wenn mögliche Interferenzen durch organische Stoffe in den Extrakten die Ergebnisse verfälschen. Zugabe von Na 2 SO 4 (um die H 2 SO 4 -Interferenzen zu unterdrücken) gab schwankende Werte, da einige As-Werte höher, andere" tief er lagen. Wenn Extrakte von unbehandeltem Karriholz als Muster untersucht wurde...

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“…*) The analytical errors for arsenic values shown are within the ± 5°0 range and those for copper within the ±3% range loo ml aliquots were solubilised with HC1 and H £ O 2 and analysed by atomic absorption spcctroscopy as described previously (Johanson 1973). The difference between total and soluble arsenic was taken to represent insoluble arsenic.…”

Section: Introductionmentioning

confidence: 99%

Arsenic on the Surface of Round Pine Treated with Cu-Cr-As Preservative

Johanson¹,

Dale²

1973

Holzforschung

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Determination of Cu-Cr-As and Zn in Preserved Wood by Atomic Absorption Spectroscopy

Cited by 10 publications

References 7 publications

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Determination of Cu-Cr-As and Zn in H₂SO₄/HNO₃digested extracts of preserved wood by atomic absorption spectroscopy with reference to As in Karri rail sleepers

Arsenic on the Surface of Round Pine Treated with Cu-Cr-As Preservative

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Determination of Cu-Cr-As and Zn in Preserved Wood by Atomic Absorption Spectroscopy

Cited by 10 publications

References 7 publications

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Arsenical Diffusion Treatment ofEucalyptus diversicolorRail Sleepers

Determination of Cu-Cr-As and Zn in H2SO4/HNO3digested extracts of preserved wood by atomic absorption spectroscopy with reference to As in Karri rail sleepers

Arsenic on the Surface of Round Pine Treated with Cu-Cr-As Preservative

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Determination of Cu-Cr-As and Zn in H₂SO₄/HNO₃digested extracts of preserved wood by atomic absorption spectroscopy with reference to As in Karri rail sleepers