Determination of total sulfur and total phosphorus in soils using fusion with alkali metal nitrates

McQuaker, Neil R.; Fung, Tony

doi:10.1021/ac60358a071

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…The total sulphur content was determined on subsamples from cores ST 3A. B & ST 4 after digestion of the samples at 450°C in a mixture of K N 0 3 and N a N 0 3 (50/50 molar %) followed by dissolution in a reagent solution of KN03/NaN03 in HCI (McQuaker & Fung 1975). The sulphur content was then measured gravimetrically after hot precipitation of SO4'-as BaSO,.…”

Section: Grain Size and Geochrwistrymentioning

confidence: 99%

Early Holocene environment on Bj�rn�ya (Svalbard) inferred from multidisciplinary lake sediment studies

Wohlfarth¹,

Lemdahl²,

Olsson³

et al. 1995

Polar Research

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Bjørnøya, a small (178 km2) island situated between the mainland of Norway and southern Spitsbergen, provides the opportunity for the reconstruction of early Holocene terrestrial and limnic palaeoenvironments in the southwestern Barents Sea. The AMS 14C dating technique, geochemical, mineral magnetic, micro and macrofossil analyses were applied to sediments recovered from lake Stevatnet and the results are interpreted in terms of palaeoenvironmental conditions between 9800 and 8300 14C bp. After the disappearance of local glaciers before ca 980014C BP, the lake productivity increased rapidly at the same time as pioneer plant communities developed on soils which gradually became more stable. Insect data indicates that strong seasonal contrasts with mean July temperatures around 9°C and mean January temperatures around −12°C prevailed between 9500 and 8300 14C BP. These high summer temperatures, possibly as much as 4‐5°C higher than the present, favoured the development of a flora including Dryas and Angelica cf. archangelica. The enhanced freeze/thaw processes led to an increased erosion of minerogenic and organic material. After 8000 14C BP the temperatures may have gradually declined. The environmental reconstruction derived from our data set supports the conceptual insolation model which proposes maximum Holocene seasonality for the Northern Hemisphere at ca 9000 14C BP.

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Section: Grain Size and Geochrwistrymentioning

confidence: 99%

Early Holocene environment on Bj�rn�ya (Svalbard) inferred from multidisciplinary lake sediment studies

Wohlfarth¹,

Lemdahl²,

Olsson³

et al. 1995

Polar Research

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“…All other samples were air-dried on plastic sheeting and ground to pass through a 2 mm nylon mesh sieve. Phosphate analysis was carried out by the method of McQuaker and Fung (1975), as described in Ottaway and Ottaway (1982), where the Ca estimation, by atomic absorption spectrophotometry, is also described.…”

Section: Methodsmentioning

confidence: 99%

Trace element analysis of soil samples from a stratified archaeological site

Ottaway

Matthews

1988

Environ Geochem Health

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Thirty-eight soil samples from a sondage excavated through a 6- metre stratified tell (Gomoiava, in central Yugoslavia) have been analysed for nine biophile elements: Mg, Sr, Zn, Cu, Ni, Mn, Cr, Pb and B. The site was occupied from 7000 BC to 500 AD (calendar years). The results have been collated with earlier estimates of P and Ca, made on a larger series of samples from the same site. The results are discussed in terms of useful information, to supplement that given by phosphate analysis, about stratification and the relationship of the settlement to its environment.It is concluded that leaching probably distorts the results for Ca and Mg. The results for Mn may help to distinguish phosphate accumulation due to man from that due to farm livestock. There is significant accumulation of Sr and B, both of which have potential value, although some of the analytical results for the latter are suspect. The results for Zn, Cu and Ni are highly correlated, with sharp peaks which couid provide precise information about individual strata when more experience of interpretation has been gained. Only Cr and Pb appear to provide little useful information at this site.

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“…The acidvolatile sulfur (AVS) in each core subsection was quickly liberated (see Nriagu 1968) and determined gravimetrically as barium sulfate. The other forms of sulfur in the residue after the AVS extraction (termed fixed sulfur) were converted to sulfate by fusion with a mixture of sodium and potassium nitrates (McQuaker and Fung 1975). The sulfate in the acid leachate was then determined gravimetrically.…”

Section: Methodsmentioning

confidence: 99%

Untitled

1976

Limnology & Oceanography

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Calculations indicate that about 6.0 x lo" kg of sulfur is released annually from Lake Ontario sediments. This constitutes about 1% of the annual sulfur input into the sediments and is insignificant compared to the total sulfur that cycles annually through the lake. The sulfur released from the sediments is enriched in 32S with the result that the sulfur in the historical layers is characterized by high 8% values.

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Determination of total sulfur and total phosphorus in soils using fusion with alkali metal nitrates

Abstract: disturb the indicator circuit and, furthermore, no proper mixing would be achieved. The measurements were evaluated on the basis of value Q determined from the recorded two symmetrical titration curves.

Cited by 17 publications

References 14 publications

Early Holocene environment on Bj�rn�ya (Svalbard) inferred from multidisciplinary lake sediment studies

Early Holocene environment on Bj�rn�ya (Svalbard) inferred from multidisciplinary lake sediment studies

Trace element analysis of soil samples from a stratified archaeological site

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