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4 edition of determination of the points of zero charge of fine mineral particles by a titration technique found in the catalog.

determination of the points of zero charge of fine mineral particles by a titration technique

D.A Stanley

determination of the points of zero charge of fine mineral particles by a titration technique

by D.A Stanley

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  • 4 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Washington .
Written in English

    Subjects:
  • Zeta potential,
  • Mineralogy, Determinative,
  • Volumetric analysis,
  • Slurry -- Electric properties

  • Edition Notes

    Bibliography: p. 7.

    Statementby D.A. Stanley, P.M. Brown, and B.J. Scheiner.
    SeriesReport of investigations / United States Department of the Interior, Bureau of Mines ;, 8635, Report of investigations (United States. Bureau of Mines) ;, 8635.
    ContributionsBrown, P. M., Scheiner, Bernard J.
    Classifications
    LC ClassificationsTN23 .U43 no. 8635, QD571 .U43 no. 8635
    The Physical Object
    Pagination7 p. :
    ID Numbers
    Open LibraryOL3922848M
    LC Control Number81607191

    Ch. Gravimetric Analysis Outline: • Examples of Gravimetric Analysis • Precipitation • Examples of G.A. calculations • Combustion Analysis • Precipitation Titration Curves • Titration of a Mixture • Endpoint Detection • Note: this is Ch. 27 in the 7th edition. Updated Dec. 4, Slide 1 modified.   It seems to me that you have actually done a time - consuming fine titration when you were actually doing the rough titration. This rough titration result is noted and discarded. Now you carry out the proper titration (fine titration) You can start by adding a volume a little less than that given by the rough titration - say mL NaOH solution.

    pH and Point of Zero Charge (PZC) Determination. The pH was determined by gently boiling 50 mL of Milli-Q water in a flask containing g of the samples for 5 mins. The pH was measured using a Mettler Toledo pH meter after the solution was cooled to room temperature. Mass titration technique was used to determine the PZC [22, 25]. Potentiometric titration curve pH Added OH [OH] eq! In a potentiometric titration of an acid, the potential E of an electrochemical cell is measured. pH is calculated from E=Eo+RTln10pH+E j! The equivalence point is taken as the steepest point of a curve showing pH vs. added [OH–], or preferrably determined by linearisation, i.e.: {H+}=10E o!

    Total acidity of 12 samples of honey was determined by the potentiometric titration technique. For the evaluation of potentiometric titration curves a graphical procedure was applied which permits the determination of the end-point of the titration even in cases where, due to the asymmetry of the titration curve, the inflection point cannot be detected exactly. position. The main advantages of this technique over more widely used procedures are that measurements can be conducted at room temperature and on technique to include mineral .


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Determination of the points of zero charge of fine mineral particles by a titration technique by D.A Stanley Download PDF EPUB FB2

The Bureau of Mines has developed a simple titration technique for determining the points of zero charge (pzc) on minerals. The technique consists of titrating a mineral slurry with the potassium salt of polyvinyl sulfuric acid (pvsk) in the presence of an indicatory dye and a positively charged polymer.

Get this from a library. The determination of the points of zero charge of fine mineral particles by a titration technique. [D A Stanley; P M Brown; Bernard J Scheiner].

The determination of the points of zero charge of fine mineral particles by a titration technique / By D. (Donald A.) Stanley, Bernard J. Scheiner and P. (Pat M.) Brown Abstract. Points of zero charge were determined on two highly weathered surface soils from Puerto Rico, an Oxisol and Ultisol, as well as mineral-standard kaolinite and synthetic goethite using three methods: (1) potentiometric titration measuring the adsorption of H + and OH − on amphoteric surfaces in solutions of varying ionic strength (I) (point of zero salt effect), (2) direct assessment of surface Cited by: To determine the point of zero charge, 10 mL of a NaCl solution (M) with a pH value between and units, adjusted with hydrochloric acid solution and/or sodium hydroxide, was used.

manual titration with detection of end-point visually and 2) automatic titration using a spectrophotometer to more precisely determine the end-point. The results show that there are several problems involved in the method of colloidal titration.

The variation in the values of negative surface charge was larger for the manual titration than. kinetic methods. The experimental point of zero charge from mass titration for such a binary suspension can be used for comparison with a model.

For the quantitative interpretation, the knowledge of the specific surface areas, the mass fractions of the components and the points of zero charge of both metal oxides14,15 is re-quired. Determination of the point of zero charge, pzc of a simple metal oxide by a potentiometric mass titration technique, PMT.

The term “isoelectric point of solid” (IEPS) was defined by Parks as the pH value, at which the immersed solid oxide has a zero net charge. Parks wrote: “The IEPS and the ZPC (zero point of charge) are identical by definition”. AGC Book 20% CyanBasics of Titration Titration Theory Basics of Titration.

Basics of titration. Contents. Titration is an analytical technique which allows the quantitative determination of a specific substance In type of titration the point is identified where analyte and reagent are present in equivalent amounts.

Titrations. A titration is an analytical chemistry technique that is often used to characterize an acid/base solution. In a titration, a strong acid/base of accurate concentration is added stepwise in small amounts (aliquots) to incrementally neutralize the solution.

tings, run a titration on 3 different tests or replicates. Results should be accepted between 99 and %. Inflection Point Titration Manager Operational Qualification Calculations are programmed to give a result according to the de-livered titrant volume at the inflec-tion point situated in the accept-ance range pH Dynamic IP.

filtration. In the filtration-rate technique, the suspen- sion was prepared with deionized distilled water, not,\ / I I l I I 9 f 80 90 SUSPENSION pH Figure 2.

Determination of the zero point of charge of syn- thetic goethite by the filtration-rate technique. Filtration time. end-point titration.

You can perform an analysis by adding excess titrant then determine the inflection-point graphically or mathematically. This is known as automatic inflection-point determination. Diagram 1: General shape of a titration curve E infl = Analyte/titrant equivalence = Value of the preset end-point.

Typically, a sample is held at oC for 24 hours. Advantages: Safe, few reagents are required, many samples can be analyzed simultaneously, not labor intensive, and ash can be analyzed for specific mineral content.

end point detection. End point of zinc titration is easily detected with Eriochrome Black T. solutions used. To perform titration we will need titrant - M EDTA solution and ammonia pH buffer. We will also need indicator - either in the form of solution, or ground with NaCl - mg of indicator plus 20 g of analytical grade NaCl.

A new methodology is presented, called differential potentiometric titration (DPT), which allows the determination of the point of zero charge (pzc) of metal (hydr)oxides using only one potentiometric curve.

Using these two techniques i.e. the determination of zero point of charge and the zeta potential (in mV) as a function of pH, it was hoped to characterise the samples of hematite. These hematites can be compared directly by comparing the values of zpc and iep determined using these two techniques.

Surface Chemistry of Hematite and Goethite. Potentiometric titration» End point detection Many things that have been told about use of indicators in acid-base titration hold also for potentiometric titrations.

The higher the concentration of the titrated substance and the titrant, the longer the steep part of the titration curve and the easier the redox indicator selection. SearchWorks Catalog Stanford Libraries. Catalog start Organization The determination of the points of zero change of fine mineral particles by a titration technique [] Stanley, D.

(Donald A.) Pgh. [i.e. Pittsburgh], Pa.: U.S. Dept. of the Interior, Bureau of Mines. provides an indirect determination of sulfur. 9A.3 Titration Curves To find a titration’s end point, we need to monitor some property of the reaction that has a well-defined value at the equivalence point.

For example, the equivalence point for a titration of HCl with NaOH occurs at a pH of Charge Determination of Proteins KPVS Crsl 0- 6- 4- 2- Ribonuclease A FIG. 4. Titration of a dilution series of ribonuclease A at pH 2 to 7. Measurements were made as described for Fig. 3, except that the pH was changed.

The difference of added and retitrated charge equivalents of KPVS is marked on the ordinate. n.lmol.Anew method of acid value determination in vegetable oils has been developed.

The method is based on (a) simple, rapid and complete extraction of acids from an oil test portion into reagent the standard titration technique with a color in- z=1 is the activity coefficient for one-charge .