Jones’ Reductor

Jones reductor A tube containing zinc amalgam. Used for reduction of solutions (e.g. 

Two common reduction columns are used. In the Jones reductor the column is filled with amalgamated Zn prepared by briefly placing Zn granules in a solution of ITgCb to form Zn(lTg). Oxidation of the amalgamated Zn... 

The amount of Fe in a 0.4891-g sample of an ore was determined by a redox titration with K2Cr20y. The sample was dissolved in HCl and the iron brought into the +2 oxidation state using a Jones reductor. Titration to the diphenylamine sulfonic acid end point required 36.92 mL of 0.02153 M K2Cr20y. Report the iron content of the ore as %w/w FeyOy. 

Jones reductor a reduction column using a Zn amalgam as a reducing agent, (p. 341)... 

Jojoba oil Jojoba oil [61789-91-1] Jojoba wax [66625-78-3] Jominy test Jones reductor Jones separator Joosten method Jordan refiner Josamycin [16846-24-5]... 

A suitable form of the Jones reductor, with approximate dimensions, is shown in Fig. 10.17. A perforated porcelain plate, covered with glass wool, supports... 

REDUCTION WITH AMALGAMATED ZINC THE JONES REDUCTOR 10.138... 

Applications and limitations of the Jones reductor. Solutions containing 1-10 per cent by volume of sulphuric acid or 3-15 per cent by volume of concentrated hydrochloric acid can be used in the reductor. Sulphuric acid is, however, generally used, as hydrochloric acid may interfere in the subsequent titration, e.g. with potassium permanganate. 

Silver reductor hydrochloric acid solution Amalgamated zinc (Jones) reductor sulphuric acid solution... 

Although as already stated the use of metal amalgams, and in particular use of the Jones reductor or of the related silver reductor, is the best method of reducing solutions in preparation for titration with an oxidant, it may happen that for occasional use there is no Jones reductor available, and a simpler procedure will commend itself. In practical terms, the need is most likely to arise in connection with the determination of iron, for which the reduction of iron(III) to iron(II) may be necessary. 

Determination of uranium with cupferron Discussion. Cupferron does not react with uranium(VI), but uranium(IV) is quantitatively precipitated. These facts are utilised in the separation of iron, vanadium, titanium, and zirconium from uranium(VI). After precipitation of these elements in acid solution with cupferron, the uranium in the filtrate is reduced to uranium(IV) by means of a Jones reductor and then precipitated with cupferron (thus separating it from aluminium, chromium, manganese, zinc, and phosphate). Ignition of the uranium(IV) cupferron complex affords U308. 

Reductant equivalent weights of, 847 Reduction 409 by chromium(II) salts, 409 by hydrogen sulphide, 416 by Jones reductor (zinc amalgam), 410 by liquid amalgams, 412 by silver reductor, 414 by sulphurous acid, 416 by tin(II) chloride, 415 by titanium(II[), 410 by vanadium(II), 410 see also Iron(III), reduction of Reduction potentials 66 Reference electrodes potentials, (T) 554 Relative atomic masses (T) 819 Relative error 134 mean deviation, 134... 

Bajic and Jaselskis [153] described a spectrophotometric method for the determination of nitrate and nitrite in seawater. It included the reduction of nitrate and nitrite to hydroxylamine by the zinc amalgam reactor (Jones reductor) at pH 3.4 and reoxidation of the product with iron (III) in the presence of ferrozine. Interference by high levels of nitrite could be eliminated with azide treatment. Levels of nitrate of 0.1 mg/1 could be detected with a precision of 3% in the presence of large amounts of nitrite and chloride. 

Several authors observed CL emission based on reduction reactions. Lu et al. [59] developed a method by applying a Jones reductor for producing unstable reductants. A column (100 X 3 mm i.d.) filled with Zn-Hg particles was inserted into the flow stream of a flow injection system. CL was measured using a homemade CL analyzer. Although the Jones reductor was more effective for the species studied in 0.5-5 mol/L H2S04 solution, the authors found that a lower acid concentration improved the CL emission. Hie optimal pH was 6.5 for V(II), 2.5 for Mo(III), 3.5 for U(III), 3.0 for W(III), 3.0 for Cr(II), 2.5 for Ti(III), and 2.5 for Fe(II). The methods allowed determination of the above-mentioned species at pg/mL to ng/mL levels. It was assumed that the CL reactions were related to the production of superoxide radicals by dissolved oxygen in the solutions. The proposed methods could be successfully applied to the determination of V [60], Mo [61], and U [62] in water or steel samples. 

Vanadium Jones reductor, lucigenin CL, tapwater, river water, industrial wastewater 0.3 ng/mL 57... 

Jones reductor chem A device used to chemically reduce solutions, such as ferric salt solutions, consisting of a vertical tube containing granular zinc into which the solution is poured. jonz ri.dok-tor ... 

The reduction of aqueous chromium(III) solutions can be carried out electrolytically o chemically with zinc amalgam, zinc and acid or a Jones reductor.2,24 Electrolytic procedures ca be cumbersome, and with chemical reductants contamination with other products can occur Chromium metal and acid can be used to reduce chromium(III) salts, and this requires less c the metal than in the method described in Section 35.3.1.1.i. 

Fe3+ is reduced to Fe2+ with Sn2+ or a Jones reductor. Titration is carried out in 1 M H2S04 or I M HC1 containing Mn2+, H3P04, and H2S04. Mn2+ inhibits oxidation of Cl by Mn04. H3P04 complexes Fe3+ to prevent formation of yellow Fe3+-chloride complexes. 

Reduce Mo in a Jones reductor, and run the Mo3+ into excess Fe3+ in 1 M H2S04. Titrate the Fe2+ formed. 

Reduce U to U3+ with a Jones reductor. Expose to air to produce U4+, which is titrated in 1 M H2S04. 

Why don t Cr3+ and TiOz+ interfere in the analysis of Fe3+ when a Walden reductor, instead of a Jones reductor, is used for prereduction ... 

When 25.00 mL of unknown were passed through a Jones reductor, molybdate ion (Mo02 ) was converted into Mo3+. The filtrate required 16.43 mL of 0.010 33 M KMn04 to reach the purple end point. 

Bottles of HC104 should not be stored on wooden shelves, because acid spilled on wood can form explosive cellulose perchlorate esters. Perchloric acid also should not be stored near organic reagents or reducing agents. A reviewer of this book once wrote, I have seen someone substitute perchloric acid for sulfuric acid in a Jones reductor experiment with spectacular results—no explosion but the tube melted ... 

Jones reductor A column packed with zinc amalgam. An oxidized analyte is passed through to reduce the analyte, which is then titrated with an oxidizing agent. 

Jones reductor -for iron compounds [IRON COMPOUNDS] (Vol 14)... 

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