Some remarks on the presence of organic phosphates in sediments

Groot, Cornelis-Jan de

doi:10.1007/bf00041469

Cited by 35 publications

(19 citation statements)

References 12 publications

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“…After the removal of inorg-P by these extractions, a considerable amount of P remained fixed on the sediments . As the chelating extractants are milder than the classical extractants (NaOH and H2SO4), we believe that the remaining pool is organic -and is larger than has often been supposed (De Groot, 1990) . A considerable part of the remaining pool is extractable with H+ (Acid soluble org-P, ASOP) ; in the classical extractions this pool was extracted as CaCO3 ::~ P. After the ASOP extraction some phosphate still remains in the pellet .…”

Section: Annex I Extraction Schemementioning

confidence: 99%

“…Since in the present extraction scheme Fe(OOH) and CaCO3 are extracted as well, this danger is no longer present . Therefore De Groot (1990) and De Groot & Golterman (1991) were able to analyse the org-P compounds further . It was found that a c o n s i d e r a b l e q u a n t i t y o f t h e o r g -P c o u l d b e e x t r a c t e d with strong acids at low concentrations (e .g .…”

Section: Organic Phosphatesmentioning

confidence: 99%

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The labyrinth of nutrient cycles and buffers in wetlands: results based on research in the Camargue (southern France)

Golterman

1995

Hydrobiologia

113

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Wetlands, especially in the Mediterranean area, are subject to severe eutrophication . T h i s m a y u p s e t t h e e q u i l i b r i u m b e t w e e n p h y t o p l a n k t o n p r o d u c t i o n i n u n d e s i r a b l e q u a n t i t i e s a n d a q u a n t i t a t i v e l y d e s i r a b l e m a c r o p h y t e p r o d u c t i o n . I n o r d e r t o m a n a g e t h i s e q u i l i b r i u m , a q u a n t i t a t i v e k n o w l e d g e o f n u t r i e n t i n p u t a n d f l u x e s i s e s s e n t i a l a n d t h e r o l e of sediments in these processes must be understood . This knowledge can be useful even for agriculture, e .g. rice cultivation, where optimal utilization of fertilizers can lead to an economic benefit .In this article different aspects of nutrient cycles are discussed in view of approaching a sufficiently precise q u a n t i f i c a t i o n . The nutrient input balance of the Camargue was therefore measured which showed that the input of n u t r i e n t s w i t h t h e i r r i g a t i o n w a t e r , t a k e n f r o m t h e r i v e r R h o n e , r o u g h l y e q u a l s t h e q u a n t i t y o f f e r t i l i z e r s a d d e d . Phytoplankton growth can be approached reasonably with the Monod model, although there are still many practical problems, such as the influence of the pH on P uptake and the problem of measuring P uptake in the field. The situation is worse for macrophyte growth ; q u a n t i t a t i v e d a t a a r e s c a r c e a n d s t u d i e s h a v e o f t e n b e e n c a r r i e d o u t with unrealistic nutrient concentrations or without addressing the influence of the sediment . This influence can also include negative factors, such as high concentrations of Fe e+ , H 2 S o r F e S , b u t c a n n o t y e t b e q u a n t i f i e d . The nitrogen cycle in wetlands is dominated by denitrification . Most wetlands have sediments with high concentrations of organic matter, therefore with a large reducing capacity. Besides this process, we have shown that denitrification can also be controlled by FeS . In the Camargue sediments this denitrification is mediated by bacteria from the sulfur cycle ; this appeared to be the major pathway . It was shown that a stoicheiometric relation exists between nitrate reduced and sulphate produced . T h e i n f l u e n c e o f t h e t e m p e r a t u r e w a s q u a n t i f i e d a n d a p p e a r e d t o b e stronger at high organic matter concentrations than at lower ones . Denitrification with FeS means that the bacteria use nitrate also for their N demands, while this is not necessarily the case during denitrification with organic matter .Mineralization of macrophytes is a much slower process than that of phytoplankton, probably because of their high C/N ratio . We could, however, not confirm the general assumption that the addition of nitrogen stimulates this mineralization . On the contrary, we found that two amino acids both with a C/N ratio of 6 had different mineralization rates . T h e a m i n o a c i d c o m p o s i t i o n o f d ...

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Section: Annex I Extraction Schemementioning

confidence: 99%

Section: Organic Phosphatesmentioning

confidence: 99%

The labyrinth of nutrient cycles and buffers in wetlands: results based on research in the Camargue (southern France)

Golterman

1995

Hydrobiologia

113

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“…The extractability of this fraction may be affected by the presence of humic substances but information on this process is not available yet. Biochemical components such as nucleic acids, lipids and sugars may be included in the acid soluble Organic-P fraction [7]. Golterman et al [9] proposed another extractant for acid soluble Organic-P: 0.5M trichloroacetic acid (TCA).…”

Section: Resultsmentioning

confidence: 99%

“…Fe(OOH)-P is extracted with buffered CaEDTA/dithionite and CaCO 3 -P subsequently with Na 2 EDTA. In the next step, acid hydrolysable Organic-P (Organic-P ac ) is extracted with H 2 SO 4 [7] and then the remaining Organic-P (Organic-P alk ) Sediments receive a large amount of organic matter in eutrophic environment. Phosphorus is often responsible for this high primary production.…”

Section: Methodsmentioning

confidence: 99%

Humic Substances interactions with sedimentary phosphorous

Paing¹,

Gómez²,

Picot³

1999

Analusis

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“…Acid-OP includes apatite-bound phosphate and biochemical components such as nucleic acids, lipids, and sugars that bound to phosphate (De Groot 1990). The main component of alkali-OP is humic substances (Golterman 2001).…”

Section: Discussionmentioning

confidence: 99%

Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

Renjith

Chandramohanakumar

Joseph

2010

Environ Monit Assess

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Phosphorus fractionation was employed to find the bioavailability of phosphorus and its seasonal variations in the Panangad region of Cochin estuary, the largest estuarine system in the southwest coast of India. Sequential extraction of the surficial sediments using chelating agents was taken as a tool for this. Phosphate in the water column showed seasonal variations, with high values during the monsoon months, suggesting external runoff. Sediment texture was found to be the main factor influencing the spatial distribution of the geochemical parameters in the study region. Similarly, total phosphorus also showed granulometric dependence and it ranged between 319.54 and 2,938.83 μg/g. Calcium-bound fraction was the main phosphorus pool in the estuary. Significant spatial variations were observed for all bioavailable fractions; iron-bound inorganic phosphorus (5.04-474.24 μg/g), calcium-bound inorganic phosphorus (11.16-826.09 μg/g), and acidsoluble organic phosphorus (22.22-365.86 μg/g). Among the non-bioavailable phosphorus, alkalisoluble organic fraction was the major one (51.92-1,002.45 μg/g). Residual organic phosphorus was K. R. Renjith (B) · N. Chandramohanakumar · M. M. Joseph Department of Chemical Oceanography, School of Marine Sciences, Cochin University of Science and Technology, Kochi 682016, Kerala, India e-mail: renjithaqua@gmail.com comparatively smaller fraction (3.25-14.64% of total). The sandy and muddy stations showed distinct fractional composition and the speciation study could endorse the overall geochemical character. There could be buffering of phosphorus, suggested by the increase in the percentage of bioavailable fractions during the lean premonsoon period, counteracting the decreases in the external loads. Principal component analysis was employed to find the possible processes influencing the speciation of phosphorus in the study region.

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Some remarks on the presence of organic phosphates in sediments

Cited by 35 publications

References 12 publications

The labyrinth of nutrient cycles and buffers in wetlands: results based on research in the Camargue (southern France)

The labyrinth of nutrient cycles and buffers in wetlands: results based on research in the Camargue (southern France)

Humic Substances interactions with sedimentary phosphorous

Fractionation and bioavailability of phosphorus in a tropical estuary, Southwest India

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