Determination of boric acid in glass by distillation of boric and methyl esters

584

ABSTRACTS

proved procedure for determining carbon direct oxygen analysis is discussed.

monoxide

in the Schiitze

method

of

fl-Aminopicolinic acid as a reagent for the gravimetric and volumetric estimation of palladium, A. K. Majumdar and S. P. Bag, Z. anal. Chem., 164, 394 (1958). Palladium is precipitated with @-aminopicolinic acid and weighed or dissolved in excess KCN, which is back-titrated with AgNO,. Contribution lo the analytical chemistry of zirconium, J. Korkisch and A. Farag, Z. anal. Chem., 165, 6 (1958). The EDTA titration of zirconium with Solochrome Violet R indicator is described. Analytical aspects of some organic acids. Gravimetric estimation of zirconium, C. S. Pande and T. S. Srivastava, Z. anal. Chem., 165,10 (1958). In a gravimetric method for determination of zirconium, Zr is precipitated with o-phenylenedioxydiacetic acid. Gravimetric determination of beryllium in presence of other elements in alloys and minerals, Th. I. Pirtea and V. Constantinescu, Z. anal. Chem., 165, 183 (1959). Interfering elements can be marked with EDTA, while Be is precipitated with hexaminecobalt(II1) chloride. Determination of boric acid in glass by distillation of boric and methyl esters, P. Ehrlich and T. Keil, Z. anal. Chem., 165, 188 (1959). Boric acid may be determined by concentration of the methanol solution of the boric acid methyl ester and subsequent titrimetric or photometric determination. Vanadometry, K. Blaskara Rao, Z. anal. Chem., 165, 195 (1959). Trivalent antimony is quantitatively oxidized by vanadic acid with iodine monochloride as catalyst. Quinolinic acid as a reagent for the ladium, A. K. Majumdar and S. P. ladium forms a stable complex with in potassium cyanide; the excess of

gravimetric and volumetric estimation of palBag, Z. anal. Chem., 165, 247 (1959). Palquinolinic acid which is weighed or dissolved the latter is back-titrated with AgN03.

Gravimetric estimation of zirconium by m-phenylene dioxydiactic acid, C. S. Pande and T. S. Srivastava, Z. anal. Chem., 165, 343 (1959). The gravimetric determination of zirconium with this selective reagent in presence of ammonium nitrate is described. o-Chrome Black PPV, a neu) metal indicator, A. A, B. El Raheem and A.-A. Amin, Z. an&. Chem., 165, 416 (1959). The use of this indicator for EDTA titrations of zinc, manganese, nickel, cadmium, magnesium, and lead is described. The use of metal-specific indicators for precipitation-titrations. Titration of sulfate with a lead sotution, R. Piischel, E. Lassner, and P. L. Reiser, Z. anal. Chem., 166, MICROCHEMICAL

JOURNAL,

VOL.

111, ISSUE

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