Preparation and Slow-Release Properties of Clay-Based Phosphatic Fertilizers

2012 ◽  
Vol 430-432 ◽  
pp. 974-977 ◽  
Author(s):  
Jin Tian Yang ◽  
Guo Xiang Pan ◽  
Bin Cheng
Keyword(s):  
Sodium Alginate ◽  
Slow Release ◽  
Potassium Dihydrogen Phosphate ◽  
Raw Material ◽  
Dihydrogen Phosphate ◽  
Soil Leaching ◽  
Potassium Dihydrogen ◽  
Better Than ◽  
Phosphatic Fertilizers

With potassium dihydrogen phosphate acting as raw material, using grinding and adsorption methods to prepare diffrent kinds of clay-based phosphatic fertilizers. And later, using sodium alginate to coat the fertilizers. Choosing soil leaching method to evaluate their slow-release properties. The results indicate that carrier properties have great influences on slow-release properties, the effect of different carriers are as follows: bentonite > kaolin> common earth. The coordinated role of bentonite and hydrotalcite to the slow-release properties is better than the single role of bentonite. The coating of sodium alginate can improve the slow-release properties of clay-based fertilizers.

scholarly journals Validation of Simultaneous Volumetric and HPLC Methods for the Determination of Pridinol Mesylate in Raw Material

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Laura D. Simionato ◽  
Leonardo Ferello ◽  
Sebastián Stamer ◽  
Patricia D. Zubata ◽  
Adriana I. Segall
Keyword(s):  
Mobile Phase ◽  
Potassium Dihydrogen Phosphate ◽  
Hplc Method ◽  
Volumetric Method ◽  
Raw Material ◽  
Organic Layer ◽  
Dihydrogen Phosphate ◽  
Reverse Phase ◽  
Potassium Dihydrogen

Simple, sensitive, and economical simultaneous volumetric and HPLC methods for the determination of pridinol mesylate in raw material have been developed. The volumetric method is based on the reaction of pridinol with sodium lauryl sulphate in diluted sulphuric acid. Dimethyl yellow was used as indicator to detect the end point of the titration in aqueous/organic layer. The HPLC method for the determination of pridinol mesylate employs a reverse phase C18 column at ambient temperature with a mobile phase consisting of acetonitrile: 0.05 M potassium dihydrogen phosphate, pH adjusted to 5.0 (1 : 2, v/v). The flow rate was 0.8 mL/min. Quantitation was achieved with UV detection at 258 nm based on peak area. Both methods were found to be suitable for the quality control of pridinol mesylate in raw material.

Evaluation of Carboxymethylated Plectranthus edulis Starch as Suspending Agent in Metronidazole Benzoate Suspension Formulation

2019 ◽  
Vol 12 (5) ◽  
pp. 4672-4681
Author(s):  
Yonas Brhane
Keyword(s):  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Stability Studies ◽  
Potassium Dihydrogen ◽  
Suspension Formulation ◽  
Sedimentation Volume ◽  
Suspending Agents ◽  
Metronidazole Benzoate ◽  
Concentration Levels ◽  
Better Than

Carboxymethylated Plectranthus edulis, Vatke (P. edulis) [fam., Lamiaceae] starch was evaluated as a suspending agent in metronidazole benzoate suspensions in comparison with sodium carboxymethyl cellulose (NaCMC) at concentration range of 1-4% (w/v). The resulting suspensions were evaluated for their sedimentation volume (%), degree of flocculation, rheology, redispersibility, and dissolution rate. Stability studies were performed for 3 months. The apparent viscosities of the formulations prepared with carboxymethylated P. edulis starch at reaction condition E (CMPS-E) was significantly lower than that of NaCMC (p < 0.05). The flowability of the suspensions, at all concentration levels of the suspending agents, were in the order of CMPS-E > NaCMC. AT 1% concentrations, carboxymethylated P. edulis starch (76 ± 1.5%) provided significantly higher (p < 0.05) sedimentation volume than NaCMC (40 ± 1.5%). At 3% and 4%, both gave comparable sedimentation volume (100%). Potassium dihydrogen phosphate (KH2PO4) employed as a flocculating agent significantly increased (p < 0.05) the sedimentation volume of the suspensions prepared with carboxy-methylated P.edulis starch and NaCMC. The redispersibilities of CMPS-E was better than those of NaCMC. All suspensions showed a release of greater than 85% of drug within 1 h. The results of stability studies showed that all suspension formulations were stable. From the foregoing, it can be concluded that carboxymethylated P. edulis starch could be used as an alternative suspending agent.

scholarly journals Potassium Dihydrogen Phosphate Purification Process by Crystallisation in the Presence of Chelating Agents

2018 ◽  
Vol 34 (6) ◽  
pp. 2703-2707
Author(s):  
Ilia Komendo ◽  
Anna Amelina ◽  
Anna Zharova
Keyword(s):  
Reaction Time ◽  
Chelating Agents ◽  
Potassium Dihydrogen Phosphate ◽  
Raw Material ◽  
Dihydrogen Phosphate ◽  
Purification Process ◽  
Potassium Dihydrogen

This article describes the investigation of the purification process of potassium dihydrogen phosphate (KH2PO4, KDP) from iron and chromium impurities by crystallisation in the presence of different chelating agents – chelators. The best conditions of purification process such as a chelator type and its amount, reaction time were determined by experiments. The most effective chelating agents were selected. The requirements for raw material for the purification process were defined.

The role of the ice rules in the thermal properties of potassium dihydrogen phosphate

1996 ◽  
Vol 46 (3-4) ◽  
pp. 1167-1176 ◽  
Author(s):  
Takasuke Matsuo ◽  
Osamu Yamamuro ◽  
Masaharu Oguni ◽  
Hiroshi Suga
Keyword(s):  
Thermal Properties ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen

Stabilization of Cd in Ore Soil Using Modified Red Mud Materials

2017 ◽  
Vol 1142 ◽  
pp. 296-299 ◽  
Author(s):  
Hui Li Luo ◽  
Qing Zhu ◽  
Ying Zhou ◽  
Zi Lin Liu ◽  
Wei Qi Ou
Keyword(s):  
Red Mud ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Better Than

Modifications of red mud for activating available silicon (Si) by phosphates were carried on in this paper. And then the modified red mud materials were used to stabilize Cd in an ore soil. Results indicated that phosphates efficiently increase the content of available Si in red mud. In the stabilization, exchange Cd was decreased by 90.97% when using 5% potassium dihydrogen phosphate modified red mud, which was better than using raw re mud as the decrease was 77.08%. In rice pot soil, increases of residue Cd were positively correlated with the increases of available Si (P<0.05, R=0.9965). Contents of Cd in root increased 53.87% while it in rice decreased 24.17% by adding 3% modified red mud.

scholarly journals Optical Absorption Spectra of Vanadyl Ion (Impurities) in Three Host Crystal Compounds

1985 ◽  
Vol 40 (11) ◽  
pp. 1164-1166
Author(s):  
O. P. Agarwal ◽  
Prem Chand
Keyword(s):  
Optical Absorption ◽  
Potassium Dihydrogen Phosphate ◽  
Optical Data ◽  
Dihydrogen Phosphate ◽  
Host Crystal ◽  
Optical Absorption Study ◽  
Potassium Dihydrogen ◽  
Vanadyl Complexes ◽  
Vanadyl Ion ◽  
Magnesium Ammonium

Results of the optical absorption study of vanadyl ion doped in magnesium ammonium sulphate hexahydrate, rubidium sulphate and potassium dihydrogen phosphate single crystals at RT are reported. The nature of optical bands suggests a C4v symmetry of the Vanadyl complexes in conformity with the EPR results. Powder EPR data and optical data are correlated to obtain the MO coefficients.

scholarly journals The Strain Rate Sensitivity and Creep Behavior for the Tripler Plane of Potassium Dihydrogen Phosphate Crystal by Nanoindentation

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 369
Author(s):  
Jianhui Mao ◽  
Wenjun Liu ◽  
Dongfang Li ◽  
Chenkai Zhang ◽  
Yi Ma
Keyword(s):  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Creep Deformation ◽  
Potassium Dihydrogen Phosphate ◽  
Rate Sensitivity ◽  
Dislocation Nucleation ◽  
Machining Process ◽  
Dihydrogen Phosphate ◽  
Potassium Dihydrogen ◽  
Kdp Crystals

As an excellent multifunctional single crystal, potassium dihydrogen phosphate (KDP) is a well-known, difficult-to-process material for its soft-brittle and deliquescent nature. The surface mechanical properties are critical to the machining process; however, the characteristics of deformation behavior for KDP crystals have not been well studied. In this work, the strain rate effect on hardness was investigated on the mechanically polished tripler plane of a KDP crystal relying on nanoindentation technology. By increasing the strain rate from 0.001 to 0.1 s−1, hardness increased from 1.67 to 2.07 GPa. Hence, the strain rate sensitivity was determined as 0.053, and the activation volume of dislocation nucleation was 169 Å3. Based on the constant load-holding method, creep deformation was studied at various holding depths at room temperature. Under the spherical tip, creep deformation could be greatly enhanced with increasing holding depth, which was mainly due to the enlarged holding strain. Under the self-similar Berkovich indenter, creep strain could be reduced at a deeper location. Such an indentation size effect on creep deformation was firstly reported for KDP crystals. The strain rate sensitivity of the steady-state creep flow was estimated, and the creep mechanism was qualitatively discussed.

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