S. Greenfield, M. Clift, R. Belcher, H. Freiser's Analytical Chemistry of the Condensed Phosphates PDF

By S. Greenfield, M. Clift, R. Belcher, H. Freiser

ISBN-10: 0080181740

ISBN-13: 9780080181745

Analytical Chemistry of the Condensed Phosphates describes the idea that and mode of operation of assorted analytical equipment for research of the condensed phosphates.
This booklet consists of ten chapters, and starts off with a presentation of the final homes of the condensed phosphates. substantial chapters are dedicated to numerous analytical recommendations used for condensed phosphate research, similar to gravimetry, titrimetry, and electrometric, chromatographic, actual, and automatic equipment. A bankruptcy discusses the tactics for the choice of esters of the condensed phosphates. The concluding chapters survey the popular approach to quantitative research of those compounds, in addition to the practise of natural samples.
This e-book will end up invaluable to analytical, inorganic, and natural chemists and researchers.

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5. Remove the beaker from the water bath, allow to stand for 15 minutes and filter and wash as before. Place both filter papers into a tared porcelain crucible and ignite at 900-940°C after charring the filter paper at low temperature initially. Cool, and weigh as zinc pyrophosphate Ζη 2 Ρ2θ 7 . It has been said(6) of this type of procedure that whilst accurate results for pyrophosphate may be obtained in the presence of orthophosphate and no other constituents, it will only give quantitative results in the presence of triphosphate if the precipitate is allowed to stand for 12 hours and if the ratio of pyrophosphate to triphosphate is greater than 1:9.

Add 38 ml of concentrated HC1 with good mechanical stirring. Heat to bring back into solution, then salt out the product by adding 75 ml of 95% methylated spirit over a period of 1 hour. Cool the solution and separate the crystals by filtration on a sintered glass filter. Wash the crystals four times with 95% methylated spirit. Purify the crystals by dissolving in 50 ml distilled water in a 800-ml beaker. Heat on a hot plate with good mechanical stirring to effect solution. Continue to stir while adding 75 ml of 95% methylated spirit slowly over a 1-hour period.

Brazier 05) repeated this work and confirmed the formula for the precipitate [Cr(CON 2 H 4 ) 6 ]HP 2 0 7 -2 H 2 0 found by Kato et al but was unable to recover more than 75% of the pyrophosphate present. He concluded that the reagent was quite unsuitable for the determination of pyrophosphate in mixtures. Brazier(15) also tried, without success, other chromium complexes, tris(ethylenediamine)chromium(HI)chloride [Cren3]Cl3 and tris(biguanidato) chromium(III)chloride [Cr(biguan)3]Cl3. O T H E R METAL C O M P L E X E S Hexamminenickel(II)chloride [Ni(NH3)6]Cl2, tris(ethylenediamine) nickel(II)chloride [Nien3]Cl2, bis(ethylenediamine)copper(II)nitrate [Cuen 2 ](N0 3 ) 2 andtetramminezinc(II)fluoroborate[Zn(NH 3 ) 4 ](BF 4 ) 2 were also tried as précipitants for pyrophosphates by Brazier ; (15) in all cases the compounds decomposed to give the hydrated metal ions which gave the corresponding metal pyrophosphates.

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Analytical Chemistry of the Condensed Phosphates by S. Greenfield, M. Clift, R. Belcher, H. Freiser


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