Soluble Phosphate Assay, Rapid Determination of Water-Soluble Phosphorus Pentoxide in Superphosphate and Total Phosphorus Pentoxide in Dicalcium Phosphate

1958 ◽  
Vol 6 (8) ◽  
pp. 589-591 ◽  
Author(s):  
Simcha Harel ◽  
Max Tamari ◽  
Alon Talmi
Keyword(s):  
Total Phosphorus ◽  
Rapid Determination ◽  
Phosphorus Pentoxide ◽  
Water Soluble ◽  
Dicalcium Phosphate ◽  
Soluble Phosphate ◽  
Soluble Phosphorus

Evaluation of phosphate fertilizers: I. Immediate value of dicalcium phosphate, nitrophosphates, Gafsa rock phosphate basic slag and potassium metaphosphate for barley and ryegrass

1968 ◽  
Vol 70 (2) ◽  
pp. 131-138 ◽  
Author(s):  
G. E. G. Mattingly ◽  
A. Penny
Keyword(s):  
Total Phosphorus ◽  
Rock Phosphate ◽  
Growing Season ◽  
Water Soluble ◽  
Dicalcium Phosphate ◽  
Soluble Form ◽  
Soluble Phosphate ◽  
Basic Slag ◽  
Phosphate Fertilizers

SUMMARYThree granular nitrophosphates containing 5, 26 and 50 % of their total phosphorus in a water-soluble form, granular potassium metaphosphate, Gafsa rock phosphate and basic slag (both as powders) were compared with granular superphosphate and powdered dicalcium phosphate as standards in two annual experiments with ryegrass and in three experiments with barley.In 1960 total yields of ryegrass during a whole season were similar with all fertilizers. Nitrophosphate-5, Gafsa rock phosphate and basic slag acted more slowly than granular superphosphate and grass grew less well and took up less phosphorus during the first 12 weeks. Over the whole growing season more phosphorus was taken up by grass from powdered dicalcium phosphate and from granular potassium metaphosphate (0.5–2.0 mm) than from granular superphosphate (1.0–4.0 mm).Powdered dicalcium phosphate was equivalent to about 60% as much phosphorus applied as superphosphate to barley. Rock phosphate was almost inert and percentage granular superphosphate equivalents of basic slag and potassium metaphosphate were 22 and 23% respectively. Percentage superphosphate equivalents of the granular nitrophosphates were 1, 25 and 53% and almost equal to the water-soluble phosphate they contained.

Rapid determination of melamine in milk using water-soluble CdTe quantum dots as fluorescence probes

2011 ◽  
pp. 1-12 ◽  
Author(s):  
Minwei Zhang† ◽  
Hong Ping† ◽  
Xianyi Cao ◽  
Hongkun Li ◽  
Fengrui Guan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Rapid Determination ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Fluorescence Probes

Nitrogen enrichment of animal bone-derived biochars as an agricultural NP-fertilizer 

2021 ◽  
Author(s):  
Gerhard Soja ◽  
Dominik Tauber ◽  
Jan Höllrigl ◽  
Andrea Mayer ◽  
Christoph Pfeifer
Keyword(s):  
Phosphorus Content ◽  
Water Soluble ◽  
Meat Production ◽  
Colorimetric Determination ◽  
Animal Bone ◽  
Soluble Phosphorus ◽  
Sorption Potential ◽  
P Supply ◽  
Np Fertilizer

<p>Food processing creates many by-products, and not all of them are used efficiently. Especially animal-based side products are frequently considered as waste with costly disposal requirements. For recycling of the nutrients contained in these residues, also under consideration of the hygienic specifications, pyrolysis can be used to create animal bone-based biochars. A lab-scale pyrolysis reactor (Pyreka 3.0) was used to produce biochars from different bone fractions of cattle and pigs after these bones had originated as waste from abbatoir operations. This study had the objective to investigate the potential of the bone chars to serve as a phosphorus (P) supply for agricultural purposes and to study the ammonium sorption potential of these chars.</p><p>The total phosphorus content of bones reached up to 140 mg/g. The water-soluble phosphorus content was in the range of 0.16 – 0.93 mg/g, an increase in pyrolysis temperature from 350 °C to 500 °C or 650 °C increased the water-soluble content by 13.3 or 12.2 % respectively. The citric acid soluble phosphorus content was between 1.75 – 2.19 mg/g. After pyrolysis temperatures of 350 °C, slightly more phosphorus dissolved in the coal products than at 500 °C (+2.7 %) and at 650 °C (+5.5 %).</p><p>The ammonium sorption capacity of biochars produced by varying pyrolytic processes was investigated by a series of sorption experiments. The removal of ammonium by the biochars from an aqueous ammonium solution was measured by using colorimetric determination of the ammonium content. The maximum ammonium sorption results were achieved by biochars produced from bovine heads and feet respectively at a temperature of 900°C and activated with H<sub>2</sub>O.</p><p>When exposed to a solution containing 50 mg/L of ammonium, these biochars adsorbed 1.23 and 1.14 mg ammonium/g biochar, respectively. The possibility to enrich abattoir waste biochars, which are depleted in nitrogen because of the pyrolysis process, with ammonium gained from a nitrogen-enriched biogas slurry produced from animal residues of the meat production process was tested using a substitute slurry made with ammonium sulfate. The highest absorbance rate using the substitute slurry containing 10 g/L ammonium was achieved by biochar made from bovine heads and resulted in 43.1 mg ammonium/g biochar.</p><p>This study shows that bone-based biochars enriched with nitrogen from e.g. biogas digestates have significant potential as an NP-fertilizer that supports the strategies of circular economy.</p>

PHOSPHORUS AND POTASSIUM SUPPLY FOR ALFALFA IN SOILS SAMPLED AT DIFFERENT DEPTHS

1957 ◽  
Vol 37 (1) ◽  
pp. 63-72 ◽  
Author(s):  
R. L. Halstead ◽  
K. F. Nielsen ◽  
A. J. MacLean
Keyword(s):  
Total Phosphorus ◽  
Greenhouse Experiment ◽  
Water Soluble ◽  
Organic Form ◽  
Pronounced Difference ◽  
Soluble Phosphorus ◽  
Potassium Supply ◽  
Different Depths ◽  
Phosphorus And Potassium ◽  
Depth Water

Results of a greenhouse experiment, comprising soil samples taken at three depths from each of six locations in eastern Ontario, indicated that the phosphorus-supplying power of the surface was considerably greater than that of the corresponding subsurface samples of four of the soils. The relative amounts of total phosphorus in surface and subsurface samples varied with the soils, the most pronounced variation being an increase in a sandy soil with depth. The proportion of the total phosphorus found in organic form varied from 18 to 56 per cent in the surface and from 5 to 33 per cent in the subsurface samples. The amounts of acid-soluble phosphorus extracted from five of the soils increased with depth. The amounts of NaHCO3-soluble phosphorus were higher in the surface than in the subsurface samples of five of the soils. The values for acid-soluble phosphorus in five of the soils and for NaHC03-soluble phosphorus in three of the soils were not in agreement with greenhouse results.The data from the greenhouse experiment did not indicate a pronounced difference between the potassium-supplying powers of corresponding surface and subsurface samples. Exchangeable potassium did not vary appreciably between surface and subsurface samples of four of the soils but decreased in two of the soils with depth. Water-soluble potassium decreased with depth in most instances.

Ion Exchange Method for Rapid Determination of Alkalinity of Water-Soluble Tea Ash Containing High Levels of Manganese

1980 ◽  
Vol 63 (3) ◽  
pp. 460-461
Author(s):  
Saidul Z Qureshi ◽  
Fadhil M Najib ◽  
Fahmi A Mohammed
Keyword(s):  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Rapid Determination ◽  
Cation Exchange Resin ◽  
Water Soluble ◽  
Exchange Method ◽  
Strong Cation Exchange ◽  
Ion Exchange Method

Abstract An ion exchange method to determine the alkalinity of water-soluble tea ash containing high levels of manganese is described. A chromatographic column containing a strong cation exchange resin (20–50 mesh) in Na+ form, with a bed volume of 5 mL is used. The present ion exchange method is compared to pH titrations and also to the official AOAC methods (31.012, 31.015, 31.016). Results with the new method are accurate and precise.

Colorimetric assay for the rapid determination of free-base nicotine in e-liquid

2020 ◽  
Vol 12 (2) ◽  
pp. 193-199
Author(s):  
Yan-Jun Huang ◽  
Qi-Xin Deng ◽  
Hong-Qiao Lan ◽  
Zheng-Zhong Fang ◽  
Hui Chen ◽  
...  
Keyword(s):  
Rapid Determination ◽  
Colorimetric Assay ◽  
Water Soluble ◽  
Free Base ◽  
Base Form

Nicotine exists in e-liquids primarily as the monoprotonated form and free-base form. The free-base form could be evaluated by use of a water-soluble indicator.

scholarly journals SOME EFFECTS OF MOISTURE AND TEMPERATURE ON TRANSFORMATION OF MONOCALCIUM PHOSPHATE IN SOIL

1962 ◽  
Vol 42 (2) ◽  
pp. 229-239 ◽  
Author(s):  
W. C. Hinman ◽  
J. D. Beaton ◽  
D. W. L. Read
Keyword(s):  
Water Soluble ◽  
Dicalcium Phosphate ◽  
Dicalcium Phosphate Dihydrate ◽  
Inorganic P ◽  
Monocalcium Phosphate ◽  
Liesegang Rings ◽  
Phosphate Dihydrate ◽  
The Mean ◽  
Surrounding Soil

Pre-weighed monocalcium phosphate pellets, containing about 15 milligrams of P, were placed in 200 grams of soil and stored for 2 weeks at four moisture tensions and three temperatures. Pellet residues were then removed and the amount of phosphorus remaining was determined. Small cores containing pellet residues and the surrounding soil contacted by fertilizer solution were removed for determination of water-soluble and total inorganic P. Phosphate phases present at the granule sites and the surrounding soil were identified by their optical properties.The mean amount of phosphorus remaining at the granule sites was 20.2 per cent. Although both moisture tension and temperature significantly affected the quantity of phosphorus retained, no consistent trend was apparent. Residues remaining at the site of application were found to be mixtures of anhydrous and dihydrated dicalcium phosphate, with the latter predominating. Moisture tension and temperature did not greatly alter the proportion of the two phases.Periodic precipitates or Liesegang rings of dicalcium phosphate were formed in the soil surrounding monocalcium phosphate pellets. Dicalcium phosphate dihydrate was the predominant phase. The proportion of dihydrated to anhydrous dicalcium phosphate increased as the temperature decreased and as the moisture tension increased.Water-soluble P increased significantly with increased moisture tension and was significantly greater at 5 °C. than at either 16 or 27 °C. The mean of all treatments was 5.6 per cent. Increased amounts of dicalcium phosphate dihydrate in the surrounding soil seemed to be responsible for the increase in water solubility.Between 89.5 and 99.2 per cent of the added phosphorus was recovered in the water and acid extracts of soil cores containing about 1.4 cm.3 of soil.

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