Studies on Activity of Alkaline Phosphatase and Phosphorus Speciation in Sediments from Lake Hongfeng, China

2010 ◽  
Vol 113-116 ◽  
pp. 412-415
Author(s):  
Jia Jun Deng ◽  
Cui Hong Jiang ◽  
Ji Wei Hu ◽  
Xiong Hui Wei ◽  
Xian Fei Huang ◽  
...  
Keyword(s):  
Alkaline Phosphatase ◽  
Organic Phosphorus ◽  
Dry Weight ◽  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
Guizhou Province ◽  
Phosphorus Loading ◽  
Significant Activity ◽  
Average Value ◽  
High Level

Environmentally significant activity of alkaline phosphatase (APA), phosphorus loading and its species were determined in 14 sediment samples from Lake Hongfeng, one of the key drinking-water sources in Guizhou Province, China. The results of this research indicates that APA presented a high level and notable fluctuations with spatial variations in sediments, ranging from 8.712×10-5 to 25.667×10-5 mol of p-nitrophenol g−1•h-1, and the average value of total phosphorus (TP) in sediments from the lake was 1129.81 mg/kg (dry weight). The content of inorganic phosphorus (IP) was higher than that of organic phosphorus (OP), and the content of the iron/aluminum-bound phosphorus (Fe/Al-P) with phosphorus release risk was also high. In addition, the Pearson’s correlation analysis shows various correlations between APA and Ca-P, Fe/Al-P, OP and IP.

Release of Phosphorus by Certain Benthic Invertebrates

1981 ◽  
Vol 38 (8) ◽  
pp. 978-981 ◽  
Author(s):  
Wayne S. Gardner ◽  
Thomas F. Nalepa ◽  
Michael A. Quigley ◽  
John M. Malczyk
Keyword(s):  
Benthic Invertebrates ◽  
Lake Michigan ◽  
Nutrient Release ◽  
Dry Weight ◽  
Inorganic Phosphorus ◽  
Benthic Invertebrate ◽  
Phosphorus Release ◽  
Release Rates ◽  
Temperature Regimes ◽  
Two Temperature

Phosphate release rates by Stylodrilus heringianus, tubificids, and Chironomus spp. were quantified in laboratory experiments by incubating the animals in wet sand under two temperature regimes (5 and 20 °C) and under two nutritional states (full and empty guts). Inorganic phosphorus release rates (± SE) for animals incubated 24 h ranged from 0.12 ± 0.02 (n = 5) nmol phosphorus (P)∙(mg ash-free dry weight)−1∙h−1 for S. heringianus beginning with cleared guts at 5 °C to 0.81 ± 0.09 (n = 5) nmol P∙(mg ash-free dry weight)−1∙h−1 for chironomids beginning with full guts at 20 °C. Calculations based on total invertebrate bio-mass and mean basal release rate suggest that benthic invertebrate excretion could account for most P released from aerobic Lake Michigan sediments.Key words: phosphorus, benthic invertebrates, macroinvertebrates, excretion, nutrients, sediments, nutrient release

Spatial Variation in the Distribution of Phosphorus Species in the Surficial Sediments of Canadohta Lake, Pennsylvania; Implications for Internal Phosphorus Loading Estimates

1991 ◽  
Vol 48 (2) ◽  
pp. 233-237 ◽  
Author(s):  
M. L. Ostrofsky ◽  
G. G. McGee
Keyword(s):  
Organic Phosphorus ◽  
Sediment Quality ◽  
Phosphorus Release ◽  
Phosphorus Loading ◽  
Published Data ◽  
Phosphorus Species ◽  
Variable Nature ◽  
Internal Phosphorus Loading ◽  
Organic Matter Loss ◽  
Loading Estimates

The concentrations of total, loosely sorbed, metal-bound, calcium-bound, and organic phosphorus, iron, and organic matter (loss on ignition) were determined for 71 surface sediment samples from Canadohta Lake, Pennsylvania. The results indicate that lake sediments can be highly variable with respect to these parameters. Most of these parameters were highly intercorrelated, and some general patterns appear to exist based on these and previously published data. Given the highly variable nature of sediment quality, particularly among these parameters which have been shown to be good predictors of sediment phosphorus release rates, estimates of internal phosphorus loading based on a few incubated cores taken from the deepest area of a lake may contain serious errors. We recommend that sediment heterogeneity be assessed in order to determine an appropriate number and distribution of cores to be incubated for internal loading estimates.

scholarly journals Effects of algae and hydrophytes on the inorganic phosphorus pool of shallow hypereutrophic Lake Taihu

2021 ◽  
Author(s):  
Xiaojun Li ◽  
Xiaoguang Xu ◽  
Yanping Zhao ◽  
Ruiming Han ◽  
Guoxiang Wang
Keyword(s):  
Organic Phosphorus ◽  
Lake Taihu ◽  
Pearson Correlation ◽  
Eutrophic Lake ◽  
Phosphorus Release ◽  
Phosphorus Loading ◽  
Lake Ecosystem ◽  
Phosphorus Cycle ◽  
Contamination Assessment ◽  
Sediment Phosphorus

Abstract Sedimentary phosphorus is a crucially potential source of phosphorus in the eutrophic lake ecosystem. Different ecological types are supposed to affect the presence and variation of sediment phosphorus. On the basis of field investigations, the total sediment phosphorus load in Zhushan Bay was 1,457.48 mg/kg, nearly four times that of the hydrophyte-dominated area. Thereinto, 41.1% was in the form of iron and aluminum-bound phosphorus, which explicitly indicated the phosphorus contamination there. Analytical methods such as Pearson correlation, contamination assessment and principle component analysis were conducted to find out that ‘contamination’ was not equivalent to ‘release risk’. The contamination classification of East Lake Taihu was ‘clean’ in general. However, 63.3% of the total phosphorus could be mobilized under certain conditions. Therefore, light phosphorus loading does not equal to less release risk. In the long run, the implicit phosphorus release by the activation of organic phosphorus in hydrophytic areas needs close attention. This study provides a reference to understand the influence of hydrophytes and algae on the phosphorus cycle of sediment.

WATER QUALITY SIMULATION OF TE-CHI RESERVOIR USING TWO-DIMENSIONAL MODELS

1994 ◽  
Vol 30 (2) ◽  
pp. 63-72 ◽  
Author(s):  
Jan-Tai Kuo ◽  
Jiann-Homg Wu ◽  
Wen-sen Chu
Keyword(s):  
Water Quality ◽  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Ammonia Nitrogen ◽  
Quality Data ◽  
Phosphorus Loading ◽  
Limiting Factor ◽  
Two Dimensional ◽  
Quality Model ◽  
Water Quality Data

The application of a two-dimensional laterally averaged hydrodynamics model (LARM2) and a water quality model (WASP3) for the study of eutrophication problem in Te-Chi Reservoir in Taiwan is presented. The models were first calibrated and validated with field temperature and water quality data. The combined models were then used to characterize the temperature distribution, seasonal overturning phenomena, and the variations of chlorophyll-a, organic nitrogen, ammonia nitrogen, nitrate nitrogen, organic phosphorus, inorganic phosphorus, and dissolved oxygen in the reservoir. It was shown that the limiting factor for eutrophication in Te-Chi Reservoir is phosphorus, and that better control of phosphorus loading into the reservoir is the crucial step toward improving the water quality of Te-Chi Reservoir.

Characterisation of phosphorus in sediments from waste stabilization ponds

2000 ◽  
Vol 42 (10-11) ◽  
pp. 257-264 ◽  
Author(s):  
E. Gómez ◽  
J. Paing ◽  
C. Casellas ◽  
B. Picot
Keyword(s):  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
High Rate ◽  
Sediment Surface ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Iron Hydroxides ◽  
Stabilization Ponds ◽  
Waste Stabilization

The waste stabilization pond (WSP) systems are useful for the treatment of wastewater. Despite a good knowledge of these systems, the dynamics of phosphorus elimination in these systems are not well known, especially concerning the forms of phosphorus in the sediment. Phosphorus dynamics were studied with data collected from the three stabilization ponds of the Mèze (France) system. A conceptual model based on theoretical considerations was developed, and applied to each pond. The percentage of observed variation described by these models ranged between 46.2% and 74.1%. The results showed that the principal variables affecting orthophosphate in WSP systems were phosphorus input and particulate phosphorus. When the model was applied to high rate algal pond (HRAP) data, the role of photosynthesis on pH increase and P precipitation was clear. Sediments sampled in the three facultative ponds were characterised with a fractionation scheme, currently used for sediments of natural aquatic ecosystems. Inorganic phosphorus accounted for 92-94% of total sediment phosphorus, with 57–59% bound to iron hydroxides and 33–37% bound to calcium. Surprisingly, organic phosphorus represented only between 6 and 8%. Polyphosphate was detected. Phosphorus concentration was greatest in the sediment from the third pond, where an aerobic layer at the sediment surface prevented phosphorus release.

Phosphorus Speciation in Sediments from Lakes Baihua and Aha with a Typical Karstic Environment, China

2010 ◽  
Vol 113-116 ◽  
pp. 420-424 ◽  
Author(s):  
Cui Hong Jiang ◽  
Jia Jun Deng ◽  
Ji Wei Hu ◽  
Xian Fei Huang ◽  
Cun Xiong Li ◽  
...  
Keyword(s):  
Drinking Water ◽  
Principal Components ◽  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
Distribution Characteristics ◽  
Phosphorus Speciation ◽  
Environmental Features ◽  
Release Potential ◽  
Karstic Environment

This paper reports a study on distribution characteristics of phosphorus and its species in 20 sediments samples from Lakes Baihua and Aha, based on the technique of sequential extraction. Baihua and Aha, two man-made reservoirs, are key drinking-water sources. The results, compatible with local geophysical characteristics, indicate that in sediments from both lakes, the concentrations of inorganic phosphorus (IP) were higher than those of organic phosphorus (OP), and the IP consisted mainly of calcium-bound phosphorus (Ca-P), which may temporarily control phosphorus release. Moreover, the concentrations of total phosphorus (TP) in both lakes sediments were high, thus phosphorus release potential and bioavailability were highly significant. Further statistical analyses revealed significant correlations with two extractable principal components allowing interpretation of possible origins of phosphorus loadings. Furthermore, available remediation measures were briefly evaluated for both lakes in consideration of their distinctive environmental features.

Effects of oxygen concentration on phosphorus release from reflooded air-dried wetland sediments

1994 ◽  
Vol 45 (7) ◽  
pp. 1319 ◽  
Author(s):  
S Qiu ◽  
AJ McComb
Keyword(s):  
Early Stage ◽  
Sediment Cores ◽  
Lake Management ◽  
Inorganic Phosphorus ◽  
Phosphorus Release ◽  
Phosphorus Loading ◽  
Management Technique ◽  
Anaerobic Conditions ◽  
Air Drying ◽  
North Lake

Intact sediment cores from North Lake (Perth, Western Australia) were air-dried for 40 days, reflooded with lake water and incubated at 20°C. Under aerated conditions, air-drying increased phosphorus release. When aeration was stopped, air-dried sediments continued to release P into the water, but the rate was much slower than that in the early stage of the aeration. The results suggest a gradual depletion of labile phosphorus from the dried sediments. Under anaerobic conditions, the phosphate release was also markedly higher for air-dried sediments than for the 'wet' controls. The accumulation of soluble inorganic phosphorus during air-drying, owing to breakdown of organic material and a drying-induced decrease in phosphate sorption, may be the cause of release on rewetting. The results suggest that drought-induced sediment dehydration in natural wetlands may be followed by a significant increase of internal phosphorus loading under both aerobic and anaerobic conditions. Care must therefore be taken in using drawdown as a lake management technique to improve water quality.

Removal and retention of phosphorus by periphyton from wastewater with high organic load

2014 ◽  
Vol 70 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Jinxiang Cao ◽  
Xiaoxing Hong ◽  
Guofeng Pei
Keyword(s):  
Calcium Binding ◽  
Organic Phosphorus ◽  
Dry Weight ◽  
Inorganic Phosphorus ◽  
Organic Load ◽  
Removal Rates ◽  
Filamentous Green Algae ◽  
Relative Contribution ◽  
Distillery Wastewater ◽  
Pig Farm

The total phosphorus (TP) removal efficiency from organic wastewater (pig farm and distillery wastewater) were estimated by using filamentous green algae (FGA) and benthic algal mats (BAM) treatment systems under laboratory conditions, and the contents of periphyton phosphorus fractions were determined by using a sequential extraction. The removal rates of TP reached 59–78% within the first 8 days of all treatment systems and could achieve average 80% during 30 day period, and the phosphorus removal rates by using BAM was higher than that of FGA. The ability of retention TP of periphyton enhanced gradually, the BAM TP contents were higher than that of FGA, the highest TP concentrations of BAM and FGA were 26.24 and 10.52 mg P g−1·dry weight. Inorganic phosphorus (IP) always exceeded 67.5% of TP, but the organic phosphorus fraction only made up less than 20% of TP. The calcium-binding phosphorus (Ca-P) was the dominant fraction and its relative contribution to TP was more than 40%. The TP was also strongly and positively correlated with the IP and Ca-P (p < 0.01) in periphyton. It showed that the periphyton had a potential ability of rapid phosphorus removing and remarkable retention from wastewater with high load phosphorus.

Paget’s disease: clinical update

2011 ◽  
Vol 152 (33) ◽  
pp. 1337-1346
Author(s):  
Judit Donáth ◽  
Gyula Poór
Keyword(s):  
Alkaline Phosphatase ◽  
Serum Alkaline Phosphatase ◽  
Paget’S Disease ◽  
Paget's Disease ◽  
Etiologic Role ◽  
Osteoblast Activity ◽  
Chronic Disorder ◽  
Abnormal Increase ◽  
Osteoclast Function ◽  
High Level

Paget’s disease is a chronic disorder of bone remodeling, characterized by an abnormal increase of osteoclast and, hence, osteoblast activity. The imbalance of bone turnover results in the formation of unhealthy and fragile bone. It also leads to impairment of adjacent joints and to a risk of various complications. Current research focuses on the elucidation of the etiologic role viral infection and predisposing genetic factors. Paget’s disease is commonly discovered by chance; its suspicion is raised either by high level of alkaline phosphatase or by the X-ray of the pathological bone. Bisphosphonates have proven to be effective in controlling disease activity because they inhibit osteoclast function. Their use is recommended when bone-derived serum alkaline phosphatase is high and/or when disease localizations are highly suspected for the development of complications. Orv. Hetil., 2011, 152, 1337–1346.

Effects of Kanwa on Rat Gastrointestinal Phosphatases

2010 ◽  
Vol 3 (3) ◽  
pp. 1147-1152
Author(s):  
Jacob Bamaiyi ◽  
Omajali ◽  
Sanni Momoh
Keyword(s):  
Alkaline Phosphatase ◽  
Small Intestine ◽  
Acid Phosphatase ◽  
Sodium Carbonate ◽  
Elevated Level ◽  
Food Additive ◽  
Alkaline Phosphatases ◽  
Acid And Alkaline Phosphatases ◽  
Diagnostic Indices ◽  
High Level

This study investigates the effects of kanwa on rat gastrointestinal phosphatases. The rats were administered 7% w/v concentration of  trona (Kanwa) orally for a period of two weeks in order to investigate how this compound is being used as food additive in some homes in Nigeria. The Kanwa used in this study was the handpicked variety obtained from sellers from Anyigba market in eastern part of Kogi State, Nigeria. Kanwa, a hydrated sodium carbonate (Na2CO3NaHCO3.2H2O) was obtained as a dried lake salt. Acid phosphatase has the ability to dephosphorylate molecules containing phosphate group. The decreased and elevated level in serum or plasma acid and alkaline phosphatases serves as diagnostic indices for various diseases. Results showed that there was increase and decrease of acid phosphatase (ACP) activities in both the stomach and small intestine. The activities of alkaline phosphatase (ALP) fluctuated in the small intestine. However, in the stomach, an increase activity of ALP was noticed throughout the period of ‘Kanwa’ administration. We concluded that although the level of ‘Kanwa’ consumed in most homes may not be toxic if not taken continuously or repeatedly. Thus, continuous consumption should be discouraged as accumulation of high level of ‘Kanwa’ may cause damages or injuries to the various organs/tissues and may disrupt normal body function.

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