A New Method for the Determination of Ascorbic Acid in Urine

1964 ◽  
Vol 10 (7) ◽  
pp. 575-580 ◽  
Author(s):  
Lee Kum-Tatt ◽  
P C Leong
Keyword(s):  
Ascorbic Acid ◽  
Potassium Iodide ◽  
Mercuric Chloride ◽  
New Method ◽  
Potassium Iodide Solution ◽  
Sodium Thiosulphate ◽  
Simple Method ◽  
Mercurous Chloride ◽  
Iodide Solution

Abstract A simple method for the determination of ascorbic acid in urine was developed. The method is based on the quantitative reduction of mercuric chloride to mercurous chloride at pH 3.5-5.0. The insoluble mercurous chloride was separated by centrifugation, dissolved in excess standard iodine-potassium iodide solution and back-titrated with standard sodium thiosulphate. The method has precision, and as little as 1.0 mg. of ascorbic acid per 100 ml. of urine can be determined with an accuracy of ± 3%. Common substances found in urine do not interfere.

Note on the Analysis ot Chlorate Defoliants and Weed Killers

1969 ◽  
Vol 52 (6) ◽  
pp. 1294-1295
Author(s):  
Fred J Roth
Keyword(s):  
Hydrochloric Acid ◽  
Potassium Iodide ◽  
Sodium Thiosulfate ◽  
Potassium Iodide Solution ◽  
Iodide Solution

Abstract The chlorate moiety in chlorate-containing defoliant and weed killer formulations can be analyzed for conformity to guarantee as follows: quantitative release of available chlorine from hydrochloric acid by the chlorate moiety, release of iodine from a potassium iodide solution by the chlorine, and determination of iodine released by titration with standardized sodium thiosulfate.

Reactive radical study using the polyvinyl alcohol–potassium iodide solution as a new chemical probe

2021 ◽  
Author(s):  
Hiroto Matsuura ◽  
Nguyen Tran Trung ◽  
Bounyang Ouanthavinsak ◽  
Jin Sakamoto ◽  
Yuichiro Takemura ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Potassium Iodide ◽  
Potassium Iodide Solution ◽  
Chemical Probe ◽  
Iodide Solution

The use of potassium iodide solution as photochemical actinometer for vacuum ultraviolet region

2016 ◽  
Vol 38 (2) ◽  
pp. 67-70
Author(s):  
A. V. Mamaenko ◽  
A. O. Samsoni Todorov ◽  
O. V. Zui ◽  
V. A. Yaremenko ◽  
V. V. Goncharuk
Keyword(s):  
Potassium Iodide ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Potassium Iodide Solution ◽  
Iodide Solution ◽  
Vacuum Ultraviolet Region

Specific Determination of Ethylene Oxide and Ethylene Chlorohydrin in Cosmetics and Polyoxyethylated Surfactants by Gas Chromatography with Electron Capture Detection

1993 ◽  
Vol 76 (2) ◽  
pp. 292-296 ◽  
Author(s):  
Kumiko Sasaki ◽  
Keiji Kijima ◽  
Mitsuharu Takeda ◽  
Shigeo Kojima
Keyword(s):  
Gas Chromatography ◽  
Ethylene Oxide ◽  
Electron Capture ◽  
Potassium Iodide ◽  
Electron Capture Detection ◽  
Potassium Iodide Solution ◽  
Ethylene Chlorohydrin ◽  
Specific Determination ◽  
Iodide Solution ◽  
Nitrogen Stream

Abstract A simple specific determination method was developed for ethylene oxide (EO) and ethylene chlorohydrin (ECH) in cosmetics and surfactants. EO is desorbed from samples by using a nitrogen stream and absorbed into acidic potassium iodide solution, where it is converted to ethylene iodohydrin (EIH). Any remaining ECH in the samples is converted to EO by the addition of sodium hydroxide, and the desorption procedure is repeated with a fresh acidic potassium iodide absorbing solution. EIH is extracted with benzene and determined by gas chromatography with electron capture detection. EO and ECH contents in the samples are calculated from EIH results. Recoveries from water and shampoo samples were 70.3 ± 5.4 and 58.9 ± 1.2%, respectively, for EO and 66.3 ± 4.0 and 64.5 ± 4.6%, respectively, for ECH. Detection limits in 0.2-2.0 g samples were in the 0.005-0.03 μg/g range for EO and 0.01-0.07 μg/g for ECH. High levels of EO (30-394 μg/g as ECH) were found in 5 of 18 polyoxyethylated surfactant samples, but only small amounts (0.07-4.0 μg/g) of ECH were detected in the samples. EO was not detected in cosmetic samples tested, but ECH was present in small quantities (≤1.11 μg/g).

Dissolution of bismuth metal by tri-iodide ion in acidified potassium iodide solution

1970 ◽  
Vol 48 (18) ◽  
pp. 2847-2852 ◽  
Author(s):  
Digby D. MacDonald ◽  
G. A. Wright
Keyword(s):  
Metal Surface ◽  
Potassium Iodide ◽  
Potassium Iodide Solution ◽  
Kcal Mole ◽  
Rotating Disc ◽  
Rate Determining Step ◽  
Iodide Ion ◽  
Rate Of Dissolution ◽  
Reaction Proceeds ◽  
Iodide Solution

Dissolution of bismuth metal by tri-iodide ion in acidified potassium iodide medium has been studied using a rotating disc technique. The rate constant for the dissolution process, kT, in solutions 0.5 M in potassium iodide at 25.0 °C has been shown to be related to the square root of the disc angular velocity, ω, by the following expression[Formula: see text]The activation energy for this reaction was found to be 4.7 kcal mole−1. These data clearly establish that the rate of dissolution is determined by the rate at which tri-iodide ion is transported to the metal surface. In solutions of [KI] = 0.10 M, however, the rate determining step appears to involve diffusion of tri-iodide ion through a layer of BiI3 which forms on the bismuth metal surface as the reaction proceeds.

Selective Cosmetic Mercury Analysis Using a Silver Ink Screen-Printed Electrode with Potassium Iodide Solution

2008 ◽  
Vol 20 (20) ◽  
pp. 2265-2270 ◽  
Author(s):  
Mei-Hsin Chiu ◽  
Jyh-Myng Zen ◽  
Annamalai Senthil Kumar ◽  
Dhananjayan Vasu ◽  
Ying Shih
Keyword(s):  
Potassium Iodide ◽  
Potassium Iodide Solution ◽  
Screen Printed Electrode ◽  
Silver Ink ◽  
Mercury Analysis ◽  
Iodide Solution ◽  
Screen Printed

scholarly journals A new spectrofluorimetric method for the determination of ascorbic acid with bromocresol purple in pharmaceutical samples

2021 ◽  
Vol 3 (11) ◽  
Author(s):  
L. Klepo ◽  
M. Ascalic ◽  
D. Medunjanin ◽  
A. Copra-Janicijevic
Keyword(s):  
Ascorbic Acid ◽  
Folic Acid ◽  
Citric Acid ◽  
Magnesium Carbonate ◽  
New Method ◽  
Bromocresol Purple ◽  
Pharmaceutical Samples ◽  
Spectrofluorimetric Method ◽  
Calcium And Magnesium

Abstract Based on the interaction between ascorbic acid and bromocresol purple, a new simple, straightforward, and quick method for the quantification of ascorbic acid is proposed. The procedure is based on the determined quenching effect of ascorbic acid on the natural fluorescence signal of bromocresol purple in the reaction between ascorbic acid and bromocresol purple in phosphate buffer solution (pH 6). The reduction of bromocresol purple fluorescence intensity is detected at 641 nm, while excitation occurs at 318 nm. The linear relationship between the reduced fluorescence intensity of bromocresol purple and the concentration of ascorbic acid is in the range 4.65 × 10–5 to 4.65 × 10–6 mol L−1 (R2 = 0.9964), with the detection limit of 8.77 × 10–7 mol L−1 and quantification limit of 2.35 × 10–5 mol L−1. The findings in this study further show that the new method provides good precision and repeatability, as well as satisfactory recovery values in terms of accuracy. The new method is tested on fifteen samples with different amounts of ascorbic acid and additional components. The effects of interfering components such as citrus bioflavonoids, citric acid, folic acid, paracetamol, calcium, and magnesium carbonate on the intensity of fluorescence of bromocresol purple are also investigated. The effects of interfering components such as citrus bioflavonoids (routine and hesperidin), citric acid, folic acid, paracetamol, calcium, and magnesium carbonate on the intensity of fluorescence of bromocresol purple are also investigated. The results of iodometric titration point out that the new method is effective for the determination of ascorbic acid in pharmaceutical samples. Article Highlights A new spectrofluorimetric method for determination of ascorbic acid in pharmaceutical samples using bromocresol purple. Determination of optimal parameters for ascorbic acid determination in a variety of pharmaceutical samples. Examination of the influence of additional substances in the pharmaceutical samples on the analysis.

POLAROGRAPHIC DETERMINATION OF THE GAMMA ISOMER OF BENZENEHEXACHLORIDE IN INSECTICIDES AND SOIL

1949 ◽  
Vol 27f (9) ◽  
pp. 368-371
Author(s):  
H. Grass ◽  
E. Y. Spencer
Keyword(s):  
Potassium Iodide ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Polarographic Determination ◽  
Simple Method ◽  
Dropping Mercury Electrode

A precise and simple method for the determination of the gamma isomer of benzenehexachloride in commercial insecticides and soil by the dropping mercury electrode is outlined. A satisfactory supporting electrolyte consisted of 1% potassium iodide and a trace of gelatin in 50% ethanol.

INSTABILITY OF OZONE SAMPLES COLLECTED IN ALKALINE POTASSIUM IODIDE SOLUTION

AIHAJ ◽  
1992 ◽  
Vol 53 (10) ◽  
pp. 672-672 ◽  
Author(s):  
M. Hekmat ◽  
P. Fung ◽  
R. Smith
Keyword(s):  
Potassium Iodide ◽  
Potassium Iodide Solution ◽  
Iodide Solution
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