Elution system of the rare earths with EDTA[ethylenediaminetetraacetic acid] eluent

1969 ◽  
Vol 73 (9) ◽  
pp. 3102-3108 ◽  
Author(s):  
Zenzi Hagiwara
Keyword(s):  
Rare Earths ◽  
Ethylenediaminetetraacetic Acid ◽  
Edta Ethylenediaminetetraacetic Acid

Control of Zn, Cu and Mn activities in alkaline and calcareous soils equilibrated with EDTA

1982 ◽  
Vol 98 (1) ◽  
pp. 203-207 ◽  
Author(s):  
S. P. Singh
Keyword(s):  
Metal Ion ◽  
Ethylenediaminetetraacetic Acid ◽  
Ph Dependence ◽  
Calcareous Soils ◽  
Transition Metal Ions ◽  
Ion Activities ◽  
Solid Phases ◽  
Equilibrium Mole Fraction ◽  
Edta Ethylenediaminetetraacetic Acid

SUMMARYThe modified EDTA (ethylenediaminetetraacetic acid) method of determining the ionic activities in soils developed by Norvell was used to measure Zn2+, Cu2+ and Mn2+ activities including the competition of Ca and Mg for the chelating ligand EDTA. In the Zn-EDTA system, the equilibrium mole fraction of CaL2− + MgL2− increased with an increase in pH of the soil solution, thereby leading to a decrease in the concentration of transition metal ions. In view of the pH dependence of the metal ion activities, the values of the expression pM + 2 pOH (where M may be Zn, Cu or Mn) were used to discuss the possible role of various oxides, hydroxides, carbonates, sulphides and unknown solid phases in regulating the activities of Zn2+, Cu2+ and Mn2+ ions in alkaline and calcareous soils.

scholarly journals PENGARUH WAKTU DAN PELARUT EDTA (Ethylenediaminetetraacetic Acid) PADA EKSTRAKSI FUKOIDAN DARI RUMPUT LAUT COKELAT Sargassum binderi Sonder

2020 ◽  
Vol 8 (03) ◽  
pp. 265
Author(s):  
Cindy Rizka Aulia
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Sargassum Binderi ◽  
Crude Fucoidan ◽  
Edta Ethylenediaminetetraacetic Acid

Rumput laut cokelat memiliki beragam polisakarida yang terkandung di dalamnya. Salah satu polisakarida dari rumput laut cokelat yang diketahui memiliki bioaktivitas yang tinggi adalah fukoidan. Banyak penelitian telah menunjukkan bahwa bioaktivitas dari fukoidan antara lain mampu menghambat pertumbuhan sel kanker, anti koagulan, anti virial, dan sebagai immunostimulan. Mengisolasi fukoidan dari rumput laut cokelat telah banyak dilakukan dengan beragam cara. Penelitian ini bertujuan untuk mengetahui bagaimana pengaruh waktu dan konsentrasi pelarut EDTA (ethylenediaminetetraacetic acid) pada proses ekstraksi dan karakteristik fukoidan dari rumput laut cokelat jenis Sargassum binderi Sonder. Konsentrasi pelarut yang digunakan pada penelitian ini sebesar 0,15% ; 0,3%: 0,5%; 1%; dan 1,3% serta waktu ekstraksi selama 1 jam, 2 jam, 3 jam, 4 jam, dan 5 jam. Perbandingan rumput laut dan air adalah 1:30 dengan suhu ekstraksi dilakukan pada 70˚C. Dalam penelitian ini didapatkan yield crude fucoidan terbesar pada waktu ekstraksi 4 jam dan konsentrasi pelarut 1,3% yaitu sebesar 3,67%. Hasil analisis menunjukkan kandungan total gula dari ekstrak fukoidan dengan yield terbesar didapatkan sebesar 36,48% dan kandungan sulfat sebesar 17,16%.

scholarly journals Molecular Evidence for Flea-Borne Rickettsiosis in Febrile Patients from Madagascar

Pathogens ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 1482
Author(s):  
Christian Keller ◽  
Raphael Rakotozandrindrainy ◽  
Vera von Kalckreuth ◽  
Jean Noël Heriniaina ◽  
Norbert Georg Schwarz ◽  
...  
Keyword(s):  
Ethylenediaminetetraacetic Acid ◽  
Molecular Data ◽  
Antimicrobial Treatment ◽  
Accurate Diagnosis ◽  
The Other ◽  
Molecular Evidence ◽  
Rickettsial Infection ◽  
Blood Samples ◽  
Edta Ethylenediaminetetraacetic Acid

Rickettsiae may cause febrile infections in humans in tropical and subtropical regions. From Madagascar, no molecular data on the role of rickettsioses in febrile patients are available. Blood samples from patients presenting with fever in the area of the capital Antananarivo were screened for the presence of rickettsial DNA. EDTA (ethylenediaminetetraacetic acid) blood from 1020 patients presenting with pyrexia > 38.5 °C was analyzed by gltA-specific qPCR. Positive samples were confirmed by ompB-specific qPCR. From confirmed samples, the gltA amplicons were sequenced and subjected to phylogenetic analysis. From five gltA-reactive samples, two were confirmed by ompB-specific qPCR. The gltA sequence in the sample taken from a 38-year-old female showed 100% homology with R. typhi. The other sample taken from a 1.5-year-old infant was 100% homologous to R. felis. Tick-borne rickettsiae were not identified. The overall rate of febrile patients with molecular evidence for a rickettsial infection from the Madagascan study site was 0.2% (2/1020 patients). Flea-borne rickettsiosis is a rare but neglected cause of infection in Madagascar. Accurate diagnosis may prompt adequate antimicrobial treatment.

scholarly journals Assesment to Increase the Mechanical Properties of used Ballast by EDTA Solution as a Construction Material

2020 ◽  
Vol 8 (5) ◽  
pp. 157-160 ◽  
Keyword(s):  
Mechanical Properties ◽  
Ethylenediaminetetraacetic Acid ◽  
Construction Material ◽  
Road Construction ◽  
Vital Role ◽  
Irregular Shape ◽  
Edta Solution ◽  
Maximum Stability ◽  
Sharp Edges ◽  
Edta Ethylenediaminetetraacetic Acid

Ballast is playing a vital role in taking the huge loads of railways which is strong, durable and also providing maximum stability to track/permanent way. Usually having a 40mm size ballast. The Shape of the ballast is important as its irregular shape and sharp edges help in the interlocking of themselves which gives more stability and passage of drainage. Within its lifetime the ballast used to get rounded edges, unable to stabilize or interlock and losses its strength for this reduction it should be replaced with new ballast. So the waste ballast is considered as our material to be tested in our project by adding the solution called EDTA (ETHYLENEDIAMINETETRAACETIC ACID) to develop the maximum properties of ballast by crushing them to 10mm, 12.5mm and 20mm size used for road construction. This work was conducted to determine the hardness, toughness, strength of aggregate using EDTA solution. The effectiveness of aggregate using of EDTA was studied in this project by adding required concentrations of 5%, 10% to the aggregates.

Gel self-assembly of lanthanum aminopolycarboxylates with skeleton structures and adsorptions of gases

2021 ◽  
Author(s):  
Si-Yuan Wang ◽  
Zhenlang Xie ◽  
Xin Dong ◽  
Zhao-Hui Zhou
Keyword(s):  
Self Assembly ◽  
Ethylenediaminetetraacetic Acid ◽  
Iminodiacetic Acid ◽  
Nitrilotriacetic Acid ◽  
Edta Ethylenediaminetetraacetic Acid

Three lanthanum aminopolycarboxylates [La(Hida)2(H2O)2]n·nCl·4nH2O (1), K2n[La(nta)2]n·nH2O (2) and (H2en)n[La(edta)(H2O)]2n·10nH2O (3) (H2ida = iminodiacetic acid; H3nta = nitrilotriacetic acid; H4edta = ethylenediaminetetraacetic acid; en = ethylenediamine, NH2CH2CH2NH2) have been isolated by...

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