Phosphorus residue radioactivity
5.11 DICHLORVOS (025) RESIDUE AND ANALYTICAL …
The "non-saponifiable" (lipid) fraction accounted for approximately 30 –50% of radioactivity. These "bound" residues were quantitatively solubilised after acid and/or base hydrolysis resulting in ... The phosphorus moiety of the molecule was excreted via urine and faeces asmono - or di-methyl phosphates and desmethyl dichlorvos. ...
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Uranium in phosphate fertilizer production | SpringerLink
The production of fertilizers from natural phosphate ore can lead to the redistribution of uranium and other radionuclides in products, by-products and residues and, hence, to environmental impacts and increased radiation exposures. …
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Assay of protein kinases using radiolabeled ATP: a protocol
Protein kinase activity results in the incorporation of radiolabeled phosphate from [γ-32P]ATP into a peptide or protein substrate. The measurement of the amount of radioactivity incorporated ...
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Radionuclides, trace elements, and radium residence in
Water-insoluble residues from Jordan PG constitute <10% of PG mass but contain 30–65% of the 226Ra. 226Ra correlates closely with Ba in the water-insoluble residues. ... Management of low-level natural radioactivity wastes of phosphate mining and processing. Proceedings of the twelfth midyear topical symposium of the health …
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Natural radioactivity assessment of a phosphate fertilizer …
Abstract. Rock phosphate ore processing and disposal of phosphogypsum contribute to enhanced levels of natural radionuclides in the environment. The …
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Radiation and Phosphogypsum
• Both natural gypsum and phosphogypsum contain radioactivity, but phosphogypsum contains more. ... radioactivity in the stacked phosphogypsum is actually less than what was in the original phosphate ore that was taken out of the ground. Introduction; 1 – Phosphate in Agriculture. Introduction to Phosphate as a Fertilizer ...
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The Radiochemical Analysis of Phosphine Residues in …
mitted for scintillation c6unting. (ii) Radioactivity ad sorbed onto the walls of the apparatus. The apparatus wa,s carefully washed with a known amount of,a 2% so lution of 44 Decon"3 at 80° until complete removal of the radioactivity was effected. Aliquots of this solution were assayed. (iii) Radioactivity in the tobacco. (a) Digest.
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Radiation Protection and Management of NORM Residues in the Phosphate
The publication also provides information on expected radionuclide concentrations, exposure levels and the most appropriate regulatory approach in the phosphate industry, and covers the mining and beneficiation of phosphate ore, phosphoric acid production, phosphogypsum, and the manufacture and use of phosphatic fertilizers among others.
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Changes in radioactivity of phosphate rocks during the …
A gamma-spectrometric method has been developed for the determination of radioactivity of phosphate rocks, products and residues of technologies. After discussing an introduction of the phosphate processing technology, the experimental results concerning U, Th and their daughter elements and40K are presented. Furthermore, the results of …
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Combining spectroscopic and isotopic techniques gives a
A dual isotopic approach using radioactive phosphorus and the isotopic composition of oxygen associated to phosphorus to understand plant reaction to a …
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The toxic action of phosphine: Studies with 32PH3; Terminal residues …
Phosphine-32 P was used to demonstrate the presence of phosphorus residues after PH 3-treatment of wheat, flour, insects and cystine.The radioactive residue on wheat and flour is not removed by thorough aeration or by heating at baking temperature, but is largely water-soluble and consists mainly of hypophosphite and …
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5.23 TRIAZOPHOS (143) RESIDUE AND ANALYTICAL …
From one trial matching GAP in Brazil the residue of triazophos in cotton seed was 0.03 mg/kg; residues in cotton seed oil were not determined. Residues from the trial conducted at double rate reached a maximum of 0.2 mg/kg in cotton seed. Based on the 10 trials with GAP in India and Brazil, residues were 0.020, 0.021 (2), 0.023,
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Solujet Low ing Phosphate Free Liquid Detergent
Free rinsing for reliable results and no interfering residues. Passes inhibitory residue test Dilute 1:200. pH 12. Concentrated to save you money; Phosphate-free, biodegradable and readily disposable; Low ing high wetting detergent for maximum per formance; Free rinsing to give you reliable results and no interfering residues
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Phosphogypsum: potential uses and problems – a …
Phosphogypsum (PG), bauxite residue (BR), and fly ash (FA) are all by-products of different industries. This study presents the development of alkali-activated concrete (AAC) using industrial...
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Natural Radioactivity Assessment of El- Sebeaya Low …
radioactivity of phosphate ores (due to uranium, thorium and radium) can be as high as 10,000 Bq/kg. ... phosphate rock and leaching residue samples were measured and presented in Tables 1 and 2 ...
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Bio 313 Chapter 9 Flashcards
Study with Quizlet and memorize flashcards containing terms like In semiconservative replication, the original two strands of the double helix serve as templates for new strands of DNA. When replication is …
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The Discovery of Artificial Radioactivity | Physics in …
That became clear in March 1934 when Enrico Fermi in Rome demonstrated that artificial radioactivity was also produced when neutrons bombard elements of high atomic number.5 While Joliot and Curie's discovery of artificial radioactivity has been discussed earlier by historians and physicists, most do not go into detail regarding its …
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Natural radioactivity in mineral phosphate fertilizers and its …
Our focus was on investigating the presence of natural radioisotopes, particularly 238 U, 232 Th, 226 Ra, and 40 K, in commercially available mineral fertilizers, such as single and triple superphosphates, monoammonium (MAP) and diammonium …
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Effect of Bauxite Residue (red Mud) on the Availability of Phosphorus
Bauxite residue was applied at 20tha ~ to 1600ha of a 4300 ha catchment and the phosphorus concentration in drainage water dropped by more than 30% in the first year.
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Radioactivity contents in dicalcium phosphate and the …
Boric acid (H3 BO3 ) was added in order to remove borofluorides. After digestion and evaporation, the residue was dissolved in 100 mL 1 M HCl. After the addition of ascorbic acid to reduce Fe3+, Table 1 Description of the analyzed samples of dicalcium phosphate (DCP) and tricalcium phosphate (TCP). ... [10] A.J. Poole, D.J. Allington, A.J ...
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Radioactivity in Future Phosphogypsum: New predictions …
P fertilisers are themselves significant pollutants but their production from RP also leaves a phosphogypsum (PG) by-product that is sufficiently radioactive that its reuse is …
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Measuring and modelling the radiological impact of a
Phosphogypsum (PG) is a waste product (residue) from the production of phosphoric acid characterized by technologically enhanced natural radioactivity. Croatia's largest PG …
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Radioactivity in Future Phosphogypsum: New predictions …
1. Introduction. Phosphogypsum (PG), a significant Technologically Enhanced Naturally Occurring Radioactive Material (TENORM) (IAEA, 2003), is a by-product of phosphoric acid production from rock phosphate – a process that underpins inorganic P fertiliser production for agriculture.Global food production is currently dependent on …
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Natural Radioactivity Assessment of a Phosphate …
Phosphorus needs to be selectively extracted to enhance its purity and value as a resource. We propose a hydrothermal treatment using subcritical acid solution as a simple, low-energy means to...
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Environmental impact assessment of phosphate fertilizers …
The radiological and elemental hazards indices of phosphate fertilizers and phosphogypsum waste were investigated by determination of their components concentration using Instrumental Neutron Activation Analysis (INAA) then comparing the resultant concentrations with the acceptable limit. The radioactivity of 40 K, 232 Th and …
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Applications of Isotopes and Radiation in Agriculture*
crop production, insect and pest control, livestock production and health, chemical residues and pollution and food preservation. The Agriculture Section of the IAEA Laboratory at Seibersdorf, outside Vienna, supports those efforts when needed in terms of training, research and services. * Adapted from the IAEA publication "Isotopes in Day to ...
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Phosphogypsum recycling in the building materials industry …
Phosphogypsum can be classified as a Naturally Occurring Radioactive Material (NORM) residue of the phosphate fertilizer industry. One of the main environmental concerns of …
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Crop residue phosphorus: speciation and potential bio …
Background and AimsPhosphorus (P) mineralisation from crop residues is usually predicted from total P or carbon: phosphorus (C: P) ratios. However, these measures have limited accuracy as they do not take into account the presence of different P species that may be mineralised at different rates. In this study P speciation was …
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Phosphogypsum circular economy considerations: A critical …
Despite the interest in rare earth element (REE) recovery, PG still largely (about 96 wt%) consists of gypsum. Depending on the type of the phosphate ore, traces of Cd, Zn, Pb, Hg, Zr, Cu, Ba, REEs, Y, Th, U and 226 Ra (which gives off 222 Ra) are the most common and relevant trace elements in PG. The radioactivity of the PG is usually …
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Pesticide residues in food 2019
The residue definitions for tendazole are for compliance with MRL and for dietary risk ... Radioactivity of orange flesh was always < 0.01 mg eq/kg, and only the homogenised, washed peel were sequentially shaken with 1N NaOH/phosphate buffer pH 8, extracted with ethyl acetate, phosphate buffer pH 8 again and then
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