Determination of low concentrations of organic phosphorus in soil solution

Martín, María; Celi, Luisella; Barberis, Elisabetta

doi:10.1080/00103629909370341

Cited by 60 publications

(33 citation statements)

References 9 publications

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“…On the obtained suspensions, total phosphorus was determined colorimetrically after sulpho-perchloric digestion (Martin et al 1999) before (total P, TP) and after filtration of the samples through Albert RC membrane 0.45-μm filters (total dissolved P, TDP). RP was determined also on the filtered samples.…”

Section: Determination Of P Forms In the Suspended Solidsmentioning

confidence: 99%

“…Carbonates were determined volumetrically. Organic C was obtained by the difference between total and carbonate C. Total phosphorus was determined after soil H 2 SO 4 -HClO 4 digestion (Kuo 1996) by measuring the amount of P in solution, as described by Martin et al (1999). Available P was extracted according to Olsen et al (1954) and determined colorimetrically by the ascorbic acid molybdate blue method.…”

Section: Soil Characterisation and Dispersion Testmentioning

confidence: 99%

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Effect of agronomic management on risk of suspended solids and phosphorus losses from soil to waters

et al. 2011

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Purpose Fertilisation may cause an accumulation of phosphorus in soil, which may increase risk of P transfer to waters both in colloidal and dissolved forms. This study evaluated the effect of agronomic management on the potential risk of P losses from soil to water bodies in a long-term experimental platform (NW Italy) subjected for 15 years to different maize-based crops and mineral or organic fertilisation based on nitrogen crop requirements. Materials and methodsThe field experiment is based on maize for grain and maize for silage cropping systems fertilised with nitrogen-phosphorus-potassium and phosphorus-potassium or with manure and slurry. Soil and P losses were estimated using a simple dispersion test and the amount of suspended solids, total P, colloidal and soluble P determined. Suspended solids were also characterised for their Fe, Al, Ca, C and N contents. Results and discussion Fertilisation management, mineral or organic, strongly modified the processes which drive soil P buildup and its mobilisation rather than the cropping system type. Manure and slurry application for 15 years has led to a larger P soil surplus compared to mineral fertilisation. However, the contrasting effect of added organic material and P on aggregation/dispersion processes resulted in minor losses of dispersed solids and colloidal P than those expected from the P increase and high Olsen P. Potentially mobilised P was mostly found in suspended solids (>92%); however, a consistent amount of dissolved P was present in the manured soils, indicating that in soils which have reached excessive P levels and are close to P saturation, mobilisation of dissolved P becomes relevant. The amount of dissolved P was well related with Olsen P (r 2 =0.92, on average), whilst, surprisingly, particulate P was not related, indicating that particulate P losses cannot be estimated only considering the soil P status. Mineral or organic fertilisation caused also a preferential selection of the suspended solids which showed a different composition, highlighting that the type of fertilisation may affect not only the amount but also the type of P and suspended solids which are mobilised. Conclusions These findings show that fertilisation, mineral and organic, rather than cropping system strongly affects the amount and the type of suspended solids and P which are mobilised. This may have important implications on understanding the factors and mechanisms that control P transfer and its release from particles into waters.

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Section: Determination Of P Forms In the Suspended Solidsmentioning

confidence: 99%

Section: Soil Characterisation and Dispersion Testmentioning

confidence: 99%

Effect of agronomic management on risk of suspended solids and phosphorus losses from soil to waters

et al. 2011

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“…Phytic acid, for example, is one of the more resistant compounds to hydrolysis and is also one of the most refractory organic phosphorus compounds found in soils [75,119,141]. Other organic phosphorus compounds found in soil leachate and runoff are the sugar phosphorus compounds, e.g.…”

Section: Model Compoundsmentioning

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

159

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“…Both elements were determined by atomic absorption spectroscopy. Total P was determined after digestion with concentrated HClO 4 -H 2 SO 4 at 473 K for 30 min (Martin et al 1999). The inorganic phosphate produced was measured as described by Ohno and Zibilske (1991).…”

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confidence: 99%

Interaction of Organic Phosphorus With Clays Extracted From Oxisols

Giaveno¹,

Celi²,

Cessa

et al. 2008

Soil Science

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In highly weathered soils, such as tropical soils, organic phosphorus (P) may decline together with total P and could be represented by a relatively lower amount of inositol phosphates compared with temperate soils. The aim of this work was to understand the abiotic processes leading to inositol phosphate retention in highly weathered soils. Sorption of myo-inositol hexakisphosphate and inorganic phosphate (Pi) on two clay fractions (A and B) extracted from Brazilian oxisols was studied, examining both the extent of P retention and surface property modifications induced by anion sorption. The two clays were characterized by a high amount of crystalline iron oxides and kaolinite. In clay A, gibbsite was also present, plus a higher amount of organic matter. The two clays presented a similar specific surface area, but clay A had a lower microporosity. The amount of Pi sorbed on the two clays was similar, reaching a plateau at about 1.35 2mol m j2 , whereas the amount of myo-inositol hexakisphosphate was higher on clay A, 0.67 2mol m j2 , than clay B, 0.49 2mol m j2 . The retention of both P forms on the two clays was linked to the large presence of crystalline Fe and Al oxides. Whereas Pi adsorbed on the external surfaces and diffused into micropores, myo-inositol hexakisphosphate likely adsorbed only on the external surfaces. The precipitation of Al and Fe myo-inositol hexakisphosphate was also limited because of the small amounts of soluble Al and Fe forms. All these phenomena may contribute to justify the relatively low accumulation of these organic P compounds found in some highly weathered soils. (Soil Science 2008;173:694-706)

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Determination of low concentrations of organic phosphorus in soil solution

Cited by 60 publications

References 9 publications

Effect of agronomic management on risk of suspended solids and phosphorus losses from soil to waters

Effect of agronomic management on risk of suspended solids and phosphorus losses from soil to waters

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

Interaction of Organic Phosphorus With Clays Extracted From Oxisols

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