Hydration of species derived from ascorbic acid in aqueous solution. An experimental and theoretical study by using DFT calculations

2013 ◽  
Vol 181 ◽  
pp. 34-43 ◽  
Author(s):  
Laura Cecilia Bichara ◽  
Silvia Antonia Brandán
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Dft Calculations ◽  
Theoretical Study

scholarly journals Spectrophotometric determination of phosphorus in coal and coal ash using bismuth-phosphomobybdate complex

2003 ◽  
Vol 68 (1) ◽  
pp. 65-73 ◽  
Author(s):  
Randjel Mihajlovic ◽  
Natasa Ignjatovic ◽  
Marija Todorovic ◽  
Ivanka Holclajtner-Antunovic ◽  
Vesna Kaljevic
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Acid Medium ◽  
Spectrophotometric Method ◽  
Methyl Ketone ◽  
Coal Ash ◽  
Molar Absorptivity ◽  
Stable Complex ◽  
Tolerance Limits

A modified spectrophotometric method using the bismuth phosphomolybdate complex for the determination of phosphorus in coal and coal ash is suggested. Bismuth together with phosphate and molybdate forms a very stable complex in acid medium which turns blue ("molibdenum blue") by reduction with ascorbic acid. The apparent molar absorptivity of PBiMo is 1.66x104 dm3 mol-1cm-1 at 720 nm and 2.10x104 dm3 mol-1cm-1 at 670 nm isobutyl methyl ketone (MIBK). Interference caused by the ions present are within the tolerance limits (?2 %). Beer?s law is obeyed in the for concentration range to 0.6 ?g/mL (aqueous solution) and to 1.2 ?g/mL P (MIBK). The sensitivity of the proposed method is 0.0078 ?g/mL (aqueous solution) and 0.0066 ?g/mL (MIBK).

Why is glycine a zwitterion in aqueous solution? A theoretical study of solvent stabilising factors

1996 ◽  
Vol 260 (1-2) ◽  
pp. 21-26 ◽  
Author(s):  
F.R. Tortonda ◽  
J.L. Pascual-Ahuir ◽  
E. Silla ◽  
I. Tuñón
Keyword(s):  
Aqueous Solution ◽  
Theoretical Study

Rate of Anaerobic Degradation of Ascorbic Acid in Aqueous Solution

1963 ◽  
Vol 52 (10) ◽  
pp. 948-954 ◽  
Author(s):  
Per Finholt ◽  
Rolf B. Paulssen ◽  
Takeru Higuchi
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Anaerobic Degradation
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