Changes in Inorganic Phosphate Concentration Occurring During Seawater Sample Storage1

Gilmartin, Malvern

doi:10.4319/lo.1967.12.2.0325

Cited by 25 publications

(12 citation statements)

References 4 publications

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“…For decades, marine chemists have tested the suitability of various preservation techniques, considering the potential effects of storage container, temperature, chemical additions, and radiation on samples of different water types (Gilmartin, 1967;Maher and Woo, 1998;Murphy and Riley, 1956). The considerable body of literature presents varied and often contradictory opinions on the effectiveness of various preservation methods.…”

Section: B Sample Processing Preservation and Storagementioning

confidence: 99%

Dynamics of Dissolved Organic Phosphorus

Karl

Björkman

2015

Biogeochemistry of Marine Dissolved Organic Matter

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Section: B Sample Processing Preservation and Storagementioning

confidence: 99%

Dynamics of Dissolved Organic Phosphorus

Karl

Björkman

2015

Biogeochemistry of Marine Dissolved Organic Matter

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“…Phosphorus is sensitive to transformations between different species as well as to uptake by micro-organisms and adsorption and desorption from particulates and the surfaces of the container vessel during both long-and short-term storage (Bull et al, 1994;Haygarth et al, 1995). Transformations in individual P species during storage can, therefore, result in increases or decreases in concentrations of the P fractions that are measured routinely in water quality programmes (Gilmartin, 1967). Phosphorus transformations may occur during storage because of several processes.…”

Section: Storage Of Samples Prior To P Analysismentioning

confidence: 99%

“…Preservatives commonly used for sample stabilisation (with varying degrees of success) include chloroform (Gilmartin, 1967;Pichet et al, 1979), mercuric chloride (Skjemstad and Reeve, 1978;Fishman et al, 1986), iodine (Mackereth et al, 1978) and H 2 SO 4 (Henriksen, 1969). However, the application of chemical preservatives may be problematic (Haygarth et al, 1995).…”

Section: Chemical Preservativesmentioning

confidence: 99%

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Review of robust measurement of phosphorus in river water: sampling, storage, fractionation and sensitivity

Jarvie

Withers

Neal

2002

Hydrol. Earth Syst. Sci.

181

164

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This paper reviews current knowledge on sampling, storage and analysis of phosphorus (P) in river waters. Potential sensitivity of rivers with different physical, chemical and biological characteristics (trophic status, turbidity, flow regime, matrix chemistry) is examined in terms of errors associated with sampling, sample preparation, storage, contamination, interference and analytical errors. Key issues identified include:The need to tailor analytical reagents and concentrations to take into account the characteristics of the sample matrix. The effects of matrix interference on the colorimetric analysis. The influence of variable rates of phospho-molybdenum blue colour formation. The differing responses of river waters to physical and chemical conditions of storage. The higher sensitivities of samples with low P concentrations to storage and analytical errors.Given high variability of river water characteristics in space and time, no single standardised methodology for sampling, storage and analysis of P in rivers can be offered. 'Good Practice' guidelines are suggested, which recommend that protocols for sampling, storage and analysis of river water for P is based on thorough site-specific method testing and assessment of P stability on storage. For wider sampling programmes at the regional/national scale where intensive site-specific method and stability testing are not feasible, 'Precautionary Practice' guidelines are suggested. The study highlights key areas requiring further investigation for improving methodological rigour.

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“…These changes may arise from bacterial or enzymatic decomposition of dissolved organic phosphorus (DOP), from the utilization of MRP by bacteria (Gilmartin, 1967), or by adsorption onto detritus or sample bottle walls, or both (Heron, 1962). Several storage treatments, to minimise alterations in the concentration of MRP, including the addition of preservatives (Gilmartin, 1967;Heron, 1962;Murphy and Riley, 1956) and freezing (Collier and Marvin, 1953;Gilmartin 1967;Heron, 1962;Jones, 1963;Macdonald and McLaughlin, 1982) have been reported. These treatments may lead to difficulties in subsequent analysis.…”

Section: Introductionmentioning

confidence: 97%

Effect of storage on soluble phosphorus fractions in water extracts of soils

Vaz

Shand²,

Edwards³

1994

Communications in Soil Science and Plant Analysis

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The effects of storage on soluble phosphorus (P) fractions in water extracts of two soils, and standard solutions of inorganic and organic P compounds have been quantified. The water extracts were obtained from a peaty podzol and an iron humus podzol and contained about 140 and 270 μg P/dm 3 , respectively. The standard solutions contined 100 μg P/dm 3 . Storage conditions investigated included different types of containers (glass and polythene), different temperatures (4, 22, and -12°C), and times. Hydrolysis of dissolved condensed phosphorus (DCP) and dissolved organic phosphorus (DOP) compounds in the water extract of the soils and standard solutions were observed at 4 and 22°C after one day. Total dissolved phosphorus (TDP) in the standard P solutions was not significantly affected by storage. However, TDP in water extracts of soils decreased significantly when the solutions were stored in polythene at 22°C. The loss of P after 15 days was 56 and 31% in the extracts from the peaty podzol and iron humus podzol, respectively. In relation to the storage of samples frozen at -12°C, freeze-thawing the water extracts of the soils or standard solutions did not affect their P composition. Storage of a water extract of the peaty podzol in polythene at 4°C for 74 days did not affect TDP but MRP increased by 60% at the expense of both DOP and DCP.

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Changes in Inorganic Phosphate Concentration Occurring During Seawater Sample Storage1

Cited by 25 publications

References 4 publications

Dynamics of Dissolved Organic Phosphorus

Dynamics of Dissolved Organic Phosphorus

Review of robust measurement of phosphorus in river water: sampling, storage, fractionation and sensitivity

Effect of storage on soluble phosphorus fractions in water extracts of soils

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