Determination of ferromanganese and ferrosilicon by ammonium ferrous sulfate titration and ICP

2020 ◽  
Vol 2 (1) ◽  
pp. 29-33
Author(s):  
Lei Ming
Keyword(s):  
Ferrous Sulfate ◽  
Ammonium Ferrous Sulfate

Determination of Vanadium Valency in Roasted Stone Coal by Separate Dissolve-Potentiometric Titration Method

2012 ◽  
Vol 1380 ◽  
Author(s):  
Bao Shenxu ◽  
Zhang Yimin ◽  
Hang Jing ◽  
Yang Xiao ◽  
Hu Yangjia
Keyword(s):  
Phosphoric Acid ◽  
Titration Curve ◽  
Ferrous Sulfate ◽  
Acid Leaching ◽  
Nitrogen Atmosphere ◽  
Ferrous Ion ◽  
Water Leaching ◽  
Stone Coal ◽  
Ammonium Ferrous Sulfate

ABSTRACTStone coal is an important vanadium-bearing resource in China. Most vanadium exists in stone coal as V(III), which is stable and not easily to be extracted. The V(III) should be oxidized to V(IV) and/or V(V) by roasting with additives at high temperature and then extracted by acid leaching and/or water leaching. Hence, the vanadium valency in roasted stone coal can reflect the roasting efficiency and leaching rate. In traditional digestion process, the V(V) can oxidize V(III) in solution and this causes great error to the determination of vanadium valency. In this study, the V(IV) and V(V) in roasted stone coal is dissolved firstly in 5% of hydrochloric acid at room temperature for 1h because the V(III) embedded in crystal lattice can not dissolve in dilute acid. The acid solution containing V(IV) and V(V) is titrated by 0.02 M ammonium ferrous sulfate (AFS), and the jump in titration curve indicates the reducing of V(V) to V(IV) by ferrous ion. The volume of V(V) can be calculated according to the consumption of AFS. The total volume of vanadium can be determined by potassium permanganate oxidation-ammonium ferrous sulfate titrimetric method. Hence, the volume of V(IV) can be obtained by deducting the quantity of V(V) from the total vanadium. Secondly, the undissolved residue is digested in Teflon vessel by phosphoric acid and hydrofluoric acid at 90 °C for 2h. The digestion solution is also titrated by AFS under nitrogen atmosphere, and the jump in titration curve denotes the reducing of V(IV) to V(III) by ferrous ion in phosphoric acid medium. So, the volume of V(III) and V(IV) can be obtained in the same way. This method is characterized by high measuring accuracy and excellent reproducibility.

Reunderstanding of the "Preparation of Ammonium Ferrous Sulfate": One of the Best Examples of Critical Thinking Education Experiment

Daxue Huaxue ◽  
2018 ◽  
Vol 33 (9) ◽  
pp. 88-94
Author(s):  
Zhiqiang DONG ◽  
◽  
Yinyun LÜ ◽  
Yanping REN
Keyword(s):  
Critical Thinking ◽  
Ferrous Sulfate ◽  
Ammonium Ferrous Sulfate

Determination of Mercury and Bromides with 1,10-Phenanthroline Ferrous Sulfate

1951 ◽  
Vol 23 (8) ◽  
pp. 1181-1183 ◽  
Author(s):  
M Hall ◽  
Geo. Smith
Keyword(s):  
Ferrous Sulfate

A Simplified Ferrous Sulfate Method for the Determination of Vanadium in Steel.

1915 ◽  
Vol 7 (5) ◽  
pp. 419-420
Author(s):  
George T. Dougherty
Keyword(s):  
Ferrous Sulfate

Dyeing of Pearl Fiber by Walnut Peel Dye

2012 ◽  
Vol 441 ◽  
pp. 66-71 ◽  
Author(s):  
Chao Ping Dong ◽  
Jie Dong ◽  
Jian Ming Xia
Keyword(s):  
Ferrous Sulfate ◽  
Evaluation Index ◽  
Single Factor ◽  
Dyeing Process ◽  
Ammonium Ferrous Sulfate ◽  
Liquor Ratio ◽  
Orthogonal Experiments ◽  
Dyeing Method ◽  
Pearl Fiber ◽  
Peel Extract

This paper studied the metachrome process of an optimal dyeing method by comparing the color and fastness of walnut peel extract applied on the pearl fiber with ammonium ferrous sulfate as mordent. In addition, the paper also ascertained the reasonable dyeing process, that is, pH 9, walnut peel extract (the dye) dosage 200 ml/L, mordant (ammonium ferrous sulfate) 2.5 g/L, temperature 80 °C, time 60 min and liquor ratio 1:30, through analysis on single-factor experiments and orthogonal experiments by taking K/S as an evaluation index for the dyeing effect. The results showed that a better effect is achievable by dyeing the pearl fiber with walnut peel dye through the metachrome process.

scholarly journals Determination of Folic Acid in Multivitamin Preparations by Reversed Phase HPLC

2021 ◽  
Vol 11 (3) ◽  
pp. 185-192
Author(s):  
A. S. Alekseeva ◽  
M. V. Gavrilin ◽  
T. B. Shemeryankina ◽  
M. S. Smirnova ◽  
E. P. Fedorova ◽  
...  
Keyword(s):  
Folic Acid ◽  
Silica Gel ◽  
Ferrous Sulfate ◽  
Reversed Phase ◽  
Asymmetry Factor ◽  
Array Detector ◽  
Isocratic Elution ◽  
Rp Hplc ◽  
Acid Determination

A great variety of components in multivitamin preparations containing folic acid, and a variety of test methods and conditions of folic acid determination proposed by manufacturers, require alignment of test procedures for products with similar composition.The aim of the study was to compare the results of experimental verification of folic acid determination procedures which use reversed phase high-performance liquid chromatography (RP HPLC) with isocratic elution mode. Materials and methods: The Agilent 1260 Infinity II LC system with a diode array detector (280 nm), isocratic elution mode, C8- and C18-bonded silica gel chromatographic columns, model mixtures containing folic acid, cyanocobalamin, ferrous sulfate, and potassium iodide, were used in the study.Results: The lowest relative standard deviation of the folic acid peak area (RSD=0.09%), and the lowest asymmetry factor (As=1.04) for folic acid were observed for the model mixture “ferrous sulfate+folic acid+cyanocobalamin” and the following test conditions. Column: 250×4.0 mm, silica gel for chromatography, octylsilyl (C8), endcapped; mobile phase:  methanol‒phosphate buffer (12:88), pH 6.6; column temperature: 25ºС. The study demonstrated the feasibility of using these conditions for determination of pteroic acid impurity with simultaneous precipitation of interfering ferrous ions, using ethylenediaminetetraacetic acid solution, pH 9.5, as a solvent.Conclusions: RP HPLC can be recommended as an optimal aligned test procedure for determination of folic acid in combination products. It is recommended to use a solution containing folic and pteroic acids for system suitability testing.

The Volumetric Determination of Nitrates with Ferrous Sulfate as Reducing Agent

1933 ◽  
Vol 55 (4) ◽  
pp. 1454-1457 ◽  
Author(s):  
I. M. Kolthoff ◽  
E. B. Sandell ◽  
B. Moskovitz
Keyword(s):  
Ferrous Sulfate ◽  
Reducing Agent ◽  
Volumetric Determination

Research of Immobilization of Transglutaminase on Polypropylene Microporous Membranes

2011 ◽  
Vol 341-342 ◽  
pp. 338-344 ◽  
Author(s):  
Zhi Guo Na ◽  
Xue Fei Wang ◽  
Yong Qiang Ma ◽  
Lei Qian ◽  
Hong Yu Yan
Keyword(s):  
Ferrous Sulfate ◽  
Monomer Concentration ◽  
Cross Linking ◽  
Sulfate Concentration ◽  
Microporous Membranes ◽  
Activation Time ◽  
Reaction Conditions ◽  
Ammonium Ferrous Sulfate ◽  
Optimal Reaction ◽  
Grafting Degree

Activated ozone as the carrier，crylic acid as the monomer and glutaraldehyde as the cross-linking agent were used to research the immobilization of transglutaminase on polypropylene microporous membranes. The effect of ozone activation time，grafting time，grafting temperature，monomer concentration and ammonium ferrous sulfate concentration on grafting degree were studied, the Immobilization conditions were also studied. We found the optimal reaction conditions as following: consistency of hexamethylendiamine was 15%，at 50°C for 120min and consistency，at 30°C for 45minites，consistency of enzyme was 15mg/mL at 4°C. So the immobilized amount of protein could come to 30.23mg/g membrane and the activity of immobilized MTG come to 16.9U/g membrane.

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