scholarly journals INORGANIC PHOSPHORUS FORMS IN ALLUVIAL AND CALCAREOUS SOILS AS AFFECTED BY DIFFERENT PHOSPHORUS APPLICATION LEVELS AND INCUBATION PERIODS.

2011 ◽  
Vol 2 (12) ◽  
pp. 1195-1206
Author(s):  
M. W. El-Agrodi ◽  
A. A. Mosa ◽  
M. A. Elsherpiny
Keyword(s):  
Calcareous Soils ◽  
Inorganic Phosphorus ◽  
Phosphorus Forms ◽  
Incubation Periods ◽  
Phosphorus Application

Relationship between phosphorus fractions and properties of highly calcareous soils

Soil Research ◽  
2007 ◽  
Vol 45 (4) ◽  
pp. 255 ◽  
Author(s):  
Ebrahim Adhami ◽  
Hamid Reza Memarian ◽  
Farzad Rassaei ◽  
Ehsan Mahdavi ◽  
Manouchehr Maftoun ◽  
...  
Keyword(s):  
Calcareous Soils ◽  
Hydroxylamine Hydrochloride ◽  
Inorganic Phosphorus ◽  
Influential Factor ◽  
Sequential Fractionation ◽  
Inorganic P ◽  
Soil P ◽  
Fractionation Procedure ◽  
Extractable P ◽  
P Content

Inorganic phosphorus (P) sequential fractionation schemes are applicable techniques to interpret soil P status. The present study was initiated to determine the origin of various P fractions in highly calcareous soils. Inorganic P forms were determined by a sequential fractionation procedure extracting with NaOH (NaOH-P), Na citrate-bicarbonate (CB-P), Na citrate 2 times (C1-P and C2-P), Na citrate-ascorbate (CAs-P), Na citrate-bicarbonate-dithionite (CBD-P), Na acetate (NaAc-P), and HCl (HCl-P). Results showed that NaOH-P was negatively correlated with active iron oxides. CB-P was positively correlated with silt content and negatively related to citrate-bicarbonate-dithionite extractable Fe (Fed). This result illustrates the weathering effect on Ca-P, with Ca-P content declining as a consequence of weathering. A negative correlation was observed between C1-P and citrate ascorbate extractable Fe (FeCAs). Second citrate extractable P (C2-P) was negatively related to calcium carbonate equivalent and positively related to hydroxylamine-hydrochloride and neutral ammonium acetate-hydroquinone extractable Mn (Mnh and Mnq). Fine silt (Fsilt) was the most influential factor affecting CAs-P. It seemed citrate-dithionite-bicarbonate extractable Al (Ald), Mnh, and Mnq have been sinks for CBD-P, while free iron oxide compounds (Feo, Fec, and FeCAs) were a major contributing factor for the formation of NaAc-P. Stable P compounds (HCl-P) of highly calcareous soils originated from coarse silt (Csilt) and hydroxylamine-hydrochloride extractable Mn (Mnh).

Inorganic Phosphorus Fractionation of Highly Calcareous Soils of Iran

2006 ◽  
Vol 37 (13-14) ◽  
pp. 1877-1888 ◽  
Author(s):  
E. Adhami ◽  
M. Maftoun ◽  
A. Ronaghi ◽  
N. Karimian ◽  
J. Yasrebi ◽  
...  
Keyword(s):  
Calcareous Soils ◽  
Inorganic Phosphorus ◽  
Phosphorus Fractionation

Quantification of Serum Inorganic Phosphorus, Phosphatase, and Urinary Phosphate without Preliminary Treatment

1970 ◽  
Vol 16 (9) ◽  
pp. 776-780 ◽  
Author(s):  
Jesse F Goodwin
Keyword(s):  
Alkaline Phosphatase ◽  
Ascorbic Acid ◽  
Direct Method ◽  
Reference Method ◽  
Inorganic Phosphorus ◽  
Preliminary Treatment ◽  
Reduction Procedure ◽  
Phosphorus Forms ◽  
A Direct Method ◽  
Serum Phosphatase

Abstract A direct method has been devised for determining serum and urinary inorganic phosphorus and serum phosphatase activity. Inorganic phosphorus forms a phosphomolybdate complex in the presence of borate. The complex is reduced with ascorbic acid. The resulting suspension is solubilized with carbonate and the absorbance measured at 720 nm. Samples containing low to moderate concentrations of bilirubin may be assayed by the method, and it compares favorably with a p-semidine reduction procedure with use of a TCA filtrate. Alkaline phosphatase values obtained by the method in which a β-glycerophosphate substrate is used compare favorably with a reference method in which p-nitrophenolphosphate is used as a substrate. Citrates, fluorides, nitrites, oxalates, and mannitol do not appreciably affect results obtained by the method.

scholarly journals Forms of Nitrogen and Phosphorus in Suspended Solids: A Case Study of Lihu Lake, China

2020 ◽  
Vol 12 (12) ◽  
pp. 5026 ◽  
Author(s):  
Jialu Li ◽  
Qiting Zuo
Keyword(s):  
Water Quality ◽  
Suspended Solids ◽  
Inorganic Phosphorus ◽  
Nitrogen And Phosphorus ◽  
Lake Ecosystems ◽  
Phosphorus Forms ◽  
Sequential Extraction Method ◽  
Main Component ◽  
The Impact

Suspended solids are an important part of lake ecosystems, and their nitrogen and phosphorus contents have a significant effect on water quality. However, information on nitrogen and phosphorus forms in suspended solids remains limited. Therefore, a case study was conducted in Lihu Lake (China), a lake with characteristically high amounts of suspended solids. Nitrogen and phosphorus speciation in suspended solids was analyzed through a sequential extraction method. We also evaluated the sources of various forms of nitrogen and phosphorus and their different effects on eutrophication. The total nitrogen (TN) content was 758.9–3098.1 mg/kg. Moreover, the proportions of various N forms in the suspended solids of the study areas were ranked as follows: Hydrolyzable nitrogen (HN) > residual nitrogen (RN) > exchangeable nitrogen (EN). Total phosphorus (TP) ranged from 294.8 to 1066.4 mg/kg, and 58.6% of this TP was inorganic phosphorus (IP). In turn, calcium (Ca)-bound inorganic phosphorus (Ca-Pi) was the main component of IP. The correlation between various nitrogen and phosphorus forms showed that there were different sources of suspended nitrogen and phosphorus throughout Lihu Lake. Correlation analysis of water quality indices and comparative analysis with surface sediments showed that in Lihu Lake, the dissolved nitrogen and phosphorus contents in water were influenced by sediment through diffusion, while particle phosphorus content in water was influenced by suspended solids through adsorption; however, due to the higher phosphorus contents in suspended solids, we should pay more attention to the impact of suspended solids.

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