A comparison of methods for the determination of dissolved and particulate phosphorus in natural waters

Ormaza-González, Franklin Isaac; Statham, Peter J.

doi:10.1016/s0043-1354(96)00081-4

Cited by 59 publications

(39 citation statements)

References 29 publications

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“…Inorganic P concentration in the 1.0 M NH 4 Cl extract (soluble Pi) was below the detection limit by the molybdate blue method, and therefore reanalysed using the malachite green method (Ohno and Zibilske 1991). Organic P in the 0.1 M NH 4 F (Al-Po) and 0.1 M NaOH (Fe-Po) extracts was calculated as the difference between total P determined after persulfate digestion (Ormaza-González and Statham 1996) and inorganic P. Residual organic P (residual Po) was calculated as the difference of inorganic P between the H 2 SO 4 II and III extracts. Residual inorganic P (residual Pi) was calculated as the difference between total P and the sum of soluble Pi, Al-Pi and -Po, Fe-Pi and -Po, Ca-Pi, and residual Po.…”

Section: Methodsmentioning

confidence: 99%

Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

2014

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Abstract. Exploring the relationship between the accumulation of soil organic carbon (C) and the form and availability of soil phosphorus (P) is important for improved understanding of soil P availability and its regulation of C storage in forest ecosystems. Here, we investigated the relationships among soil organic C, sequentially extracted P fractions and P sorption index in 32 surface soils (0-0.15 m depth) across eight mature subtropical forests (80-400 years) in Dinghushan, China. Results showed that soil organic P (Po) accounted for 40-63% (mean 54%) of soil total P. Soil organic C was significantly positively correlated with both the content and the percentage of soluble inorganic P (Pi), Al-Po and Fe-Po fractions and the content of the Al-Pi fraction. The content of soil total Po increased significantly with soil organic C, whereas the percentage of soil total Po tended to increase with soil organic C only when soil organic C was low (<30 Mg/ha) but was relatively stable when soil organic C was high (!30 Mg/ha). Moreover, soil organic C was highly correlated with P sorption index. Our results suggest that accumulation of organic C may increase, rather than decrease, the availability of P in surface soil in mature subtropical forests.

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Section: Methodsmentioning

confidence: 99%

Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

2014

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“…Traditional methods of digestion for natural water samples include fusion, dry ashing, perchloric acid, sulphuric acid-nitric acid and boiling on a hot plate, with more recent methods generally using autoclaving, UV photooxidation and microwave heating [75]. UV photo-oxidation can be used for organic phosphorus compounds in marine and freshwaters [47,76,77] but condensed polyphosphates present in the sample will not be broken down by UV photooxidation alone [2,3,78,79] and also need to be heated to 90-120 • C in the presence of acid [75]. To ensure that all polyphosphates present in the sample are decomposed, either boiling with HCl or potassium peroxydisulfate after UV irradiation is therefore recommended [80].…”

Section: Digestion Techniquesmentioning

confidence: 99%

“…Using a borate buffer, the pH is alkaline (ca. 9.7) at the start of the digestion process and becomes acidic (pH 4-5) as the sodium hydroxide decomposes [78,90,98]. Hosomi and Sudo also reported that pH change was important and in their method the pH decreased from 12.8 to 2.0-2.1 to ensure that even condensed polyphosphates were digested [92].…”

Section: Alkaline Peroxydisulfatementioning

confidence: 99%

“…Phosphonates are refractory organic phosphorus compounds and can be released into seawater from biological sources [78,90,139], and have been detected in soils [140] and soil leachate [117]. As phosphonates contain a strong C P bond that is resistant to acid hydrolysis [139], they are useful compounds for recovery studies [78,90,97,125,126,139].…”

Section: Model Compoundsmentioning

confidence: 99%

“…As phosphonates contain a strong C P bond that is resistant to acid hydrolysis [139], they are useful compounds for recovery studies [78,90,97,125,126,139]. Condensed inorganic (e.g.…”

Section: Model Compoundsmentioning

confidence: 99%

See 2 more Smart Citations

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

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Gimbert

Mankasingh

et al. 2005

Talanta

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Determination of total phosphorus in natural waters with a simple neutral digestion method using sodium persulfate

Yuan

Zhou

et al. 2017

Limnology & Ocean Methods

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The determination of total phosphorus (TP) in an aqueous sample is based on digestion of the sample to convert phosphorus compounds into orthophosphate, which can then be determined based on spectrophotometry. The widely used oxidant, potassium persulfate, has poor aqueous solubility and requires careful handling with furnace, autoclave, or oven. Here, a very simple method for the determination of TP has been developed, using an inexpensive portable water boiler for neutral digestion and highly water soluble sodium persulfate instead of potassium persulfate. The key experimental factors have been evaluated and optimized. The optimal conditions for efficient TP determination were found to be 3 h of digestion time at sub‐boiling temperature, followed by addition of ascorbic acid to eliminate free chlorine generated from the saline sample, and then addition of the ammonium molybdate reagent for detection by UV‐Vis spectrophotometry. The detection limit is 0.02 μM using 5‐cm cuvette. Under these optimized conditions, both artificial solutions containing model phosphorus compounds (n = 19) and natural water samples (n = 14) were analyzed using both sodium persulfate and potassium persulfate. There is no significant difference between the digestion performances of these two oxidants. This new method was used to analyze natural water samples (n = 28) in comparison with the standard autoclaving method using potassium persulfate. The analytical results using this method agreed very well with the standard method. Samples of different matrix were analyzed, showing the successful application of this method in both environmental monitoring (time series and spatial survey) and marine science (spatial and vertical distribution).

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A comparison of methods for the determination of dissolved and particulate phosphorus in natural waters

Cited by 59 publications

References 29 publications

Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

Relationships of phosphorus fractions to organic carbon content in surface soils in mature subtropical forests, Dinghushan, China

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

Determination of total phosphorus in natural waters with a simple neutral digestion method using sodium persulfate

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