A rapid microdetermination of chlorine dioxide in the presence of active chlorine compounds

Wheeler, Garry L.; Lott, Peter F.; Yau, Francis W.

doi:10.1016/0026-265x(78)90061-9

Cited by 21 publications

(2 citation statements)

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“…Residual free and combined chorine in the examined solutions were determined by both DPD titrimetric and colorimetric methods described in Standard Methods and the results were identical in the desired range of 0-3 mgL -1 . Chlorine dioxide residual was determined by a modification of he Chlorophenol Red (CPR) method described first by Wheeler et al, (1978), which is based on the disappearance of the CPR color at 565 nm, and is the most specific method known for the determination of chorine dioxide without the interference of other oxidants. Ozone residuals were measured by the Indigo Colorimetric Method described in Standard Methods (method 4500-O 3 B), which is the most specific for ozone.…”

Section: Methodsmentioning

confidence: 99%

Taste and odour removal from an urban groundwater establishment – a case study

Ortenberg

Groisman

Rav-Acha

2000

Water Science and Technology

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A deep groundwater well was established in a village near Tel-Aviv, in order to supply drinking water for its 30,000 inhabitants. Although all water characteristics were within the range permitted by the Israeli regulations, operators received complaints about a funny taste and a rotten-egg odour in the water. This was attributed to the presence of 0.38 mgL -1 hydrogen sulfide. Removing the odour by the usual method of aeration was impossible because of the populated surroundings. Therefore it was decided to examine chemical oxidants for taste and odour removal. A treatment with 8 mgL -1 of chlorine successfully oxidized hydrogen sulfide but the complaints continued. This was attributed to the formation of elemental sulfur, which is converted into polysulfide that may hydrolyze to regenerate the odorous hydrogen sulfide. Treatment with 2 mgL -1 of chlorine dioxide successfully eliminates odour completely, but produces chlorite and chlorate which are above the permitted levels. A partial solution to this problem was found by a consequential treatment with 2 mgL -1 of ClO 2 for 10 min. followed by 1.5 mgL -1 of chlorine (30 min.). In this case the chlorite is reduced substantially to be within the permitted level. In addition, such treatment regenerates some of the chlorine dioxide thereby increasing its residual. The odorous H 2 S can also be eliminated with 3 mgL -1 of ozone. Advantages and disadvantages of the above treatments are discussed.

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Section: Methodsmentioning

confidence: 99%

Taste and odour removal from an urban groundwater establishment – a case study

Ortenberg

Groisman

Rav-Acha

2000

Water Science and Technology

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“…It is easy to reproduce the reaction of chlorophenol red with chlorine dioxide. However, no equation is currently postulated for the reaction [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Phosphorylated Cotton Cellulose as a Matrix for Generating Chlorine Dioxide

2023

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Currently, developing disinfectant materials is of utmost importance. A significant advantage of our fabric is its reusability. The disinfectants based on a natural polymer of cellulose have been barely investigated. Our work presents a modified cellulose material, and the data obtained for the first time on the chlorine dioxide generation process when treating the material with a sodium chlorite alcohol solution. A method of applying NaClO2 onto the fabric by impregnating it with a solution sprayed by an aerosol generator is proposed. This kind of fabric is capable of withstanding multiple usages after pre-washing and rinsing. The lowest alcohols—methanol, ethanol and isopropanol—are proposed as optimal solvents. It was shown that the phosphorylated cotton cellulose fabric impregnated with this solution generates chlorine dioxide during the first 25–35 min. Neither humidity nor expedites improve the process of releasing the chlorine dioxide, but high moisture content in the air causes the complete absorption of ClO2 by microdrops and its removal from the gas environment. A promising technique for removing the excess ClO2 by the means of UV treatment is proposed: after 15 min of treating ClO2 in the gas phase, it disappears entirely. These materials could be used as disinfectants in different industries, such as food and industrial manufacturing.

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