Open Access Technical Note

Concentrated Np- and Npk-Fertilizers Based on Kyzylkum Evaporated Phosphoric Acid, Carbamide and Potassium Chloride

Turdialieva Shahzoda, Alimov Umarbek Kadyrbergenovich, Namazov Shafoat Sattarovich, Seytnazarov Atanazar Reypnazarovich, Beglov Boris Mikhaylovich

Chemical Science International Journal, Page 1-8
DOI: 10.9734/CSJI/2019/v26i230089

In the paper the processes of carboammophos and carboammophos potassium preparation based on the ammonization of the samples by evaporated wet phosphoric acid (WPA) (35.92; 40.85; 46.41; 51.07% P2O5) to pH = 5.3 (to obtain ammophos pulp) and pH = 7.0 (to obtain diammophos pulp) with subsequent addition of 70% solution of urea and crystalline potassium chloride (60% K2O) were studied. Moreover, for urea-phosphate, weight ratio of the N: P2O5: K2O ranged from 1: 0.5 to 1: 1: 1 for the N: P2O5: K2O urea-phosphate-potassium from 1: 0.7: 0.3 to 1: 1: 1. To avoid loss of ammonia, the drying of NP- and NPK slurry based on diammonium phosphate (DAP) were produced not higher than 60 °C, and monoammonium phosphate (MAP) - first at 60°C, then at 100°C to constant weight (less than 1% H2O). It is shown that on the basis of both MAP and DAP slurry are obtaining, samples of urea-phosphate similar in composition and properties. And all brands of urea-phosphate-potassium contain a high concentration of nutrients (up to 19.7% N. 19.7% P2O5 and 19.7% K2O). Phosphorus in them is in a form digestible for plants. The strength of both NPK and NPK fertilizer granules satisfies the requirements of agriculture. Such fertilizers in agriculture are in great demand

Experimental Design: Determination of total,l digestible, and water soluble forms of phosphorus (P2O5total, P2O5deg. P2O5water) was performed on KFK-3 (λ= 440 nm) as phosphorus-vanadium-molybdenum complex. This method is based on measuring the light transmission of yellow phosphorus-vanadium-molybdenum complex relative to the reference solution containing a certain amount of phosphates. Slurry pH was adjusted and determined by potentiometric method on ionometer I-130M (Russia). The mass was cooled, and then scattered by the size of the particles. Granules with a size of 2-3 mm were subjected to strength testing. The static strength of the granules was determined according to State standard 21560.2-82. This method based on crushing the granules using for that specified weights on scale called MIP 10-1 (Russia), which indicate kgf/cm2 per granule. Further dried granules of the fertilizer were performed chemical analysis. Digestible forms of P2O5 were determined by solubility in both 2% citric acid and 0.2 M solution of Trilon B (EDTA). The nitrogen content in the products was determined by Kjeldahl — distillation of ammonia in an alkaline medium with Devard alloy followed by titration of 0.1N NaOH.  

Findings: Preparation process consists of as follow:

First slurry of  ammophos and diammophos were prepared by neutralization  of evaporated WPA containing 35.92; 40.85; 46.41; 51.07% P2O5 to pH = 5.3 (to obtain ammophos pulp) and pH = 7.0 to obtain diammophos pulp; Second to obtain NP fertilizer 70% solution of carbamide was added to MAP and DAP slurry at 60° C followed by stirring thorough. Then NP slurry was dried not higher than 100 °C for MAP and not higher than 60 °C for DAP, respectively; Third to prepare NPK fertilizer 70% solution of urea and crystalline potassium chloride (60% K2O) were added to MAP and DAP slurries. Next NPK slurry was dried not higher than 100 °C for MAP and not higher than 60 °C for DAP, respectively; Fourth NP and NPK fertilizer were tested on static strength accordingly above mentioned study design using State standard 21560.2-82; Fifth dried granules NP and NPK fertilizers were analyzed on various form of P2O5 including N and K2O.  The latter was evaluated by calculation from difference N and P2O5 accordingly weight ratio N:K and N:P2O5:K2O equal to 1:0.5; 1:0.7; 1:1 and 1:0.3:1; 1:0.5:1; 1:1:1 respectively.           

Open Access Original Research Article

Cu (II)-Red Onion Skin Extract-Azo metal Complex - A Potential for Oilfield Applications

A. A. Akaho, U. J. Chukwu, O. Akaranta

Chemical Science International Journal, Page 1-7
DOI: 10.9734/CSJI/2019/v26i230086

Red Onion skin extract (ROSE)- azo compound of 2-aminophenol and Cu (II) metal complex of the azo compound (Cu-APmROSE) were formed and characterized using FT-IR spectroscopy, UV-Visible absorption spectroscopy and Scanning electron microscopy. The IR Spectra showed the values of N=N- stretching frequency of 1512.24cm-1 at 1500 cm-1 in APmROSE. This stretching frequency is absent in the Cu-APmROSE. This is an indication of the involvement of the N=N- bond in coordination to the metal. APmROSE shows an absorption maximum at 512 nm. This band was shifted to 334 nm in Cu-APmROSE. This suggests an interaction between the Cu and the azo compound.

Open Access Original Research Article

A Highly Selective and Sensitive Spectrophotometric Method for the Determination of Lead at Ultra-trace Levels in Some Real, Environmental, Biological, Food and Soil Samples Using 5,7-Dibromo-8-Hydroxyquinoline

M. Jamaluddin Ahmed, M. Tazul Islam, Sumaira Aziz

Chemical Science International Journal, Page 1-19
DOI: 10.9734/CSJI/2019/v26i230087

A very simple, ultra-sensitive and highly selective non-extractive spectrophotometric method for the determination of trace amounts of lead using 5,7-dibromo-8-hydroxyquinoline (DBHQ) has been developed. DBHQ reacts in a slightly acidic (0.0006-0.0025 M HCl) aqueous solution with lead (II) in 30% ethanolic media to produce highly absorbent a greenish-yellow chelate which has an absorption maximum at 390 nm. The reaction is instantaneous and the absorbance remains stable for over 24 h. The average molar absorption co-efficient and Sandal’s sensitivity were found to be 6.16 x 105 L mol-1cm-1 and 5 ng cm-2 of lead (II), respectively. Linear calibration graphs were obtained for 0.01- 60.0 mg L-1 of lead (II) having detection limit of 1.0 μg L-1 and RSD 0-2%. The stoichiometric composition of the chelate is 1:2 (Pb: DBHQ). A large excess of over 60 cations, anions and complexing agents (like, chloride, phosphate, azide, tartrate, oxalate, SCN- etc.) do not interfere in the determination. The developed method was successfully used in the determination of lead levels in several Standard Reference Materials (alloys, steels, natural water, bovine liver, human urine and hair) as well as in some environmental waters (potable and polluted), biological samples (human blood, urine and hair), soil samples, food samples (vegetables, rice, wheat) solutions containing both lead (II) and lead (IV) and complex synthetic mixtures. The results of biological and food analyses by the spectrophotometric method were found to be in excellent agreement with those obtained by AAS.

Open Access Original Research Article

Synthesis and Spectroscopic Characterisation of Some Novel Butadienyl Asycyanine Colorants having Lepidine Moiety

Yasir Sajjad, Ram Ekbal Yadav, I. Ali, A. S. Ansari

Chemical Science International Journal, Page 1-6
DOI: 10.9734/CSJI/2019/v26i230090

Twenty-one novel chromophoric chain β-substituted butadienyl asycyanine colorants have been synthesized by catalytic condensation of (i) dimethylaminostyryl phenyl ketone, (ii) 4ʹ-dimethylaminostyryl-4ʹ-nitrophenyl ketone and (iii) 4ʹ-dimethylaminostyryl-4ʹ-methoxyphenyl ketone with seven lepidinium methyliodide salts in ethanolic DMF medium using piperidine as basic catalyst. These colorants were synthesized with the objective to study the effect of electron acceptor and electron donor group substituent at 4ʹ-position in the chain β-phenyl nucleus on visible absorption maxima. The newly prepared colorants were found to exhibit uniform increase in absorption maxima i.e. Red shift (RS), when collated with analogues having no substituent in the β-phenyl nucleus. Again the absorption maxima of the title colorants were found to be higher than the absorption maxima of previously prepared butadienyl colorants having quinoline mioety of same conjugated system.

Open Access Original Research Article

Synthesis, Characterization and DNA Binding Studies of (E)-1-((Pyridin-2-yl)methylidene) semicarbazide Mn(II), Co(II), Ni(II) and Cu(II) Complexes

Oinam U-wang, R. K. Bhubon Singh, W. Bembee Devi, U. Ibotomba Singh, R. K. Bindiya Devi, O. Bijeta Devi, Ramina ., Th. Surchandra Singh, Toka Swu

Chemical Science International Journal, Page 1-19
DOI: 10.9734/CSJI/2019/v26i230091

(E)-1-((pyridin-2-yl)methylidene)semicarbazide (PMSC) complexes of [Mn(PMSC)2 ]Cl2 (1), [Co(PMSC)2]Cl2 (2), [Ni(PMSC)2]Cl2.5H2O (3), and [Cu(PMSC)(H2O)]Cl2 (4) have been synthesized and characterized by different spectroscopic techniques, EPR, magnetic susceptibility and thermal stability measurements. Complex 3 crystallizes as octahedral coordination complex in monoclinic crystal system. Complexes 1 and 2 have been found to have octahedral geometries and 4 to have square planar geometry. The complexes were found to be groove binding to calf-thymus DNA.