Determination of dissolved organic phosphorus in soil solutions by an improved automated photo-oxidation procedure

Vaz, M. D. Ron; Edwards, Anthony C.; Shand, C. A.; Cresser, Malcolm S.

doi:10.1016/0039-9140(92)80129-2

Cited by 39 publications

(28 citation statements)

References 11 publications

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“…[15] Vaz et al [1992] observed that Al in soil samples may be liberated during the UV oxidation step, causing a loss in observed TSP because of adsorption of PO 4 3 À onto aluminum hydroxides. Because our samples included dust particles, we tested whether this process would impact our TSP recovery.…”

Section: Sample and Data Analysismentioning

confidence: 99%

“…Because our samples included dust particles, we tested whether this process would impact our TSP recovery. Several of the most dusty aerosol subsamples were run with and without the addition of FÀ, which acts to preferentially bind aluminum hydroxides [Vaz et al, 1992]. No reduction in TSP was found (p > 0.05, paired t test), and consequently, we omitted this step in the analysis of the remainder of the samples.…”

Section: Sample and Data Analysismentioning

confidence: 99%

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Atmospheric P deposition to the subtropical North Atlantic: sources, properties, and relationship to N deposition

et al. 2013

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[1] Biogeochemical studies show that the surface waters of the subtropical North Atlantic are highly phosphorus (P) stressed. Human activity may exacerbate phosphorus stress by enhancing atmospheric nitrogen (N) deposition and raising N/P ratios in deposition. However, the magnitude of this effect is unclear, in part, because atmospherically deposited phosphorus sources are not well known, particularly the contribution from organic phosphorus. Here we report measurements of phosphorus in aerosols and wet deposition at Miami and Barbados. African dust is the major aerosol P source at both Miami and Barbados, containing~880 ppm total phosphorus and~70 ppm soluble reactive phosphorus (SRP). Organic compounds contribute, on average, 28%-44% of soluble phosphorus in precipitation. Because of dust transport seasonality, phosphorus inputs to the North Atlantic are expected to be highly variable with 2-10 times more P deposition during summer than winter. Pollution is also an important contributor to total and soluble phosphorus in Miami aerosols and deposition. Estimated SRP deposition in Barbados and Miami is 0.21 and 0.13 mmol m À2 d À1 phosphorus, respectively. Inorganic nitrogen in excess of Redfield ratio expectations in deposition was very different between the sites, totaling 21-30 and 127-132 mmol m À2 d À1 nitrogen in Barbados and Miami, respectively; the high deposition rates at Miami are linked to pollutants. Including soluble organic nitrogen and phosphorus halved the estimates of excess nitrogen in Barbados wet deposition. Thus, the organic phosphorus fraction is important in the assessment of the magnitude of biogeochemical change of the North Atlantic caused by atmospheric deposition.Citation: Zamora, L. M., J. M. Prospero, D. A. Hansell, and J. M. Trapp (2013), Atmospheric P deposition to the subtropical North Atlantic: sources, properties, and relationship to N deposition,

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Section: Sample and Data Analysismentioning

confidence: 99%

Section: Sample and Data Analysismentioning

confidence: 99%

Atmospheric P deposition to the subtropical North Atlantic: sources, properties, and relationship to N deposition

et al. 2013

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“…However, chloroform should not be used in samples with high organic matter content, as the release of cellular enzymes into the samples is possible [26]. Other studies have recommended immediate analysis after sampling [47] or analysis after a short storage period at 4 • C in the dark (maximum 48 h) [48][49][50][51].…”

Section: Sample Preservation and Storagementioning

confidence: 99%

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Worsfold

Gimbert

Mankasingh

et al. 2005

Talanta

162

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“…A series of chemical treatments (Table 2) were performed upon each solution sample to allow the quantification of three P fractions defined by Ron Vaz et al, 1992 as follows:-(i) Total dissolved phosphorus (TDP), that which passes through a 0.45 ~m membrane filter. TDP was determined through conversion by acid digestion and oxidation of all P compounds present to orthophosphate followed by spectrophotometric analysis (APHA, 1980).…”

Section: Analytical Fractionation Of Soil Solution Phosphorusmentioning

confidence: 99%

“…Certain soluble organic P compounds for example, may act as sources of plant available P (Wild and Oke, 1966) particularly in situations where P availability limits plant growth (Helal and Sauerbeck, 1991). Where fractionations of P in soil solutions have been attempted, the contribution of organic P is often assumed to equal the difference between dissolved reactive P and total dissolved P. This may lead to overestimates of organic P as additional components such as pyrophosphate can also be present (Ron Vaz et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Phosphorus fractions in soil solution: Influence of soil acidity and fertiliser additions

Vaz¹,

Edwards²,

Shand³

et al. 1993

Plant Soil

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The influence of soil acidity and phosphorus fertilization on phosphorus fractions and dissolved organic carbon (DOC) in soil solution was quantified experimentally in an iron humus podzol. Soil solution was isolated by centrifugation from top-and sub-soil samples. Total dissolved phosphorus (TDP), dissolved reactive phosphorus (DRP), dissolved organic phosphorus (DOP) and DOC increased as soil pH and P status increased. DOP was the fraction present at the highest concentration (0.080-0.464 mg P L -1) for the majority of samples. DOC and DOP concentrations which remained relatively constant down the soil profile were also highly correlated. Soluble organic P compounds may make a significant contribution to plant available soil P particularly for soils with low fertility levels. The relatively high DOP concentrations (ca 0.227mg P L -l) found throughout the soil profile have important consequences with regards to P leaching and plant nutrition.

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Determination of dissolved organic phosphorus in soil solutions by an improved automated photo-oxidation procedure

Cited by 39 publications

References 11 publications

Atmospheric P deposition to the subtropical North Atlantic: sources, properties, and relationship to N deposition

Atmospheric P deposition to the subtropical North Atlantic: sources, properties, and relationship to N deposition

Sampling, sample treatment and quality assurance issues for the determination of phosphorus species in natural waters and soils

Phosphorus fractions in soil solution: Influence of soil acidity and fertiliser additions

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