Chemical & Biological Dynamics

{Includes more useful info, as well} "Bubnis (2009) reported the loss of chlorine dioxide in ballast water. This experiment clearly demonstrated that any chlorine dioxide residuals that might be present following the treatment of ballast water will quickly be consumed by dilution and demand. Chlorine dioxide and its transformation products (chlorite and chlorate) showed similar demand features when tested in divers waters. The author observed an initial fast demand for chlorine dioxide along with a slower continuing loss of chlorite and chlorate ions." "Photodecomposition of chlorite in aqueous solution is rapid with a half life of about 10 minutes depending on concentration. Oxygen, chloride and chlorate are produced as stable end-products with the formation of chlorine and chlorine dioxide as intermediates."

{This statement likely is not actually very applicable for chlorine dioxide used separately: "Another study (4) indicates that exposure to water over-saturated with all (3) common disinfectants – chlorine, chloramine and chlorine dioxide significantly affected stability of PEX pipe during testing, making the pipe more brittle and prone to cracking. This is another important reason to assure that your PEX plumbing pipe meets ASTM F2023 standard for resistance of PEX to chlorine. There exist opinions that F2023 is not comprehensive since it does not include chloramine and chlorine dioxide testing, but the study evidence suggests it is not necessary since all (3) disinfectants affect the pipe in a similar manner. "

A method of making a composition having the property of being able to store chlorine dioxide includes mixing an aqueous chlorine dioxide solution with a superabsorbent, water-soluble polymer that is substantially unreactive with chlorine dioxide and permitting a mixture formed thereby to form one of a gel and a solid composition. A method of delivering chlorine dioxide includes providing a gel or solid composition as described and degelling the gel or dissolving the solid composition to dispense the chlorine dioxide therefrom. A method of disinfecting a target such as water, wastewater, or ...

"It was confirmed that chemical disinfectants decay when samples are exposed to UV light. Specifically, for deionized water free chlorine was lowered to approximately 95% of initial concentration following UV treatment. In contrast, free chlorine was decreased to 89% and 84%, on average, in the tested groundwater and surface water, respectively. A similar range in decreased disinfectant concentration was also observed for chlorine dioxide and chloramines. However, no significant absorption of UV irradiation by chemical disinfectants was observed."

Chlorate including sodium chlorate is used to produce chlorine dioxide gas upon exposure to ultraviolet radiation in the presence of a suitable catalyst. Chlorine dioxide gas can be used to disinfect, bleach and for a variety of industrial and commercial purposes. A Teflon®-coated UV lamp is optionally used to irradiate a solution of chlorate.

{includes unique info on Chlorine Dioxide byproducts, etc}

The application rate of chlorine dioxide based product evaluated in this study was not an effective antimicrobial alternative to formaldehyde for sanitizing hatching eggs in hatcher cabinets prior to hatch.

PDF | SHORT SUMMARY (One paragraph, ~6 sentences) Accelerated aging experiments by the immersion of a commercial polyethylene (PE) pipe grade in 10 ppm... | Find, read and cite all the research you need on ResearchGate

Chlorine dioxide is effective in controlling the natural flora occurring in poultry chiller water (PCW). However, it is not approved for use as a disinfectant because of the lack of information pertinent to its human health risks. In PCW, most added chlorine dioxide was rapidly reduced to chlorite and chlorate. The formation of chlorite was dependent on both chlorine dioxide dose and treatment time. The chlorine dioxide demand by PCW, the consumption at a given treatment time, was found to be independent of treatment dose. When used at the demand level, half of the added chlorine dioxide was reduced to a mixture of chlorite (90%) and chlorate (10%). On the basis of the acceptable daily intake of chlorite, 0.075 mg/kg, disinfecting PCW at the level of chlorine dioxide demand, 0.30 mM (20 mg/L), is not only effective but also has a low health risk from the standpoint of chlorite and chlorate contamination.

The yield of chlorine dioxide (ClO2) is influenced by chemical conditions (e.g., initial chlorine concentration, alkalinity) and by reactor design (e.g., detention time, method for mixing chemicals)....

1995

****{Summary of specific characteristics***a 35 mg/L chlorine dioxide solution stored in a high-density Polyethylene Terephthalate (PETE) container for 45 days resulted in a 3% loss.. In contrast, the same study stored chlorine dioxide in a clear glass container for 31 days which resulted in a 12% gain, possibly due to continuing formation of chlorine dioxide from chlorite. Another study showed a 6.2% overall gain in chlorine dioxide concentration after 252 days of storage in a PETE container... Chlorite and chlorate show no disinfection capabilities and may cause adverse health effects in children... CTs required for a 2-log virus inactivation were 13 – 20 times higher at a pH of approximately 6 compared to a pH of 9 and 10... two to three-fold increase in inactivation rates per 10° C water temperature increase... bentonite appeared to offer protection or shield the viruses from chlorine dioxide... disinfection capability decreases in more turbid waters since microorganisms are protected by solid particles in water, protected by aggregation or clumping, and protected by loss of chlorine dioxide residual from oxidation of organic matter... Chlorine dioxide should easily achieve a 6-log *bacteria* inactivation at low temperatures and low pHs if chlorine dioxide is used for disinfection of more resistant viruses and cysts." "Colder water temperatures require higher CT values. Use a two-fold increase in CT for every 10° C decrease. Use longer contact time instead of higher dosages to achieve higher CT values. "

"As an oxidizer chlorine dioxide is very selective. It has this ability due to unique one-electron exchange mechanisms.

Chlorine dioxide is a chemical compound with the formula ClO2. This yellowish-green gas crystallizes as bright orange crystals at −59 °C. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching.

*****"[Note: Some statements about corrosion, reaction with phenols, Cl also released during some specific reactions, etc may have some inaccuracies] Like ozone and chlorine, chlorine dioxide is an oxidizing biocide and not a metabolic toxin. This means that chlorine dioxide kills microorganisms by disruption of the transport of nutrients across the cell wall, not by disruption of a metabolic process." "Unlike chlorine, Chlorine dioxide is effective at pH between 4 and 10. No dumping and filling with fresh water required;" "Chlorine dioxide can be used as a spray. All parts therefore, can easily be reached;" In scrubbers: "In scrubbers, Usually, a very low chlorine dioxide residual, around 0.2-ppm, is sufficient to ensure odour control." {includes effects on specific foods when rinsed}

"equivalent weight = molecular weight/ basicity Citric acid could be anyhydrous as well as monohydrous, and so the molecular weight varies accordingly. anhydrous : C6H8O7 = 192.12 mg/mol hydrous: C6H8O7.H2O = 210 mg/mol also, cirtic acid is a weak acid and doesn't oxidize completely when added to a base; it donates only a few (about 3) protons (H+). This is the basicity of the acid. Therefore, equivalent weight of citric acid= 210/3= 70 (when it is monohydrous) or 192.12/3=64.4 ( when it is anyhydrous)"

"The following conversions will enable you to blend a 25% sodium chlorite solution from Technical Sodium Chlorite (dry) product."

{Lists many ingredients and %}

{ists references to all Gov regulatory info sources re. SC and CD}{includes % & ingredients of tech-grade and various other SC products} "Sodium chlorite is available in both dry and liquid forms. The dry forms contain approximately 80% Sodium chlorite and the solutions range from 7.5% to 40% sodium chlorite."

" it is normal practice to supply water with a chlorine dioxide residual of a few tenths of a milligram per litre to act as a preservative during distribution" "The taste and odour threshold for this compound is 0.4 mg/l."

****{Components of Sodium Chlorite} "Other materials are typically added to sodium chlorite powders or solutions before they are sold. Commercial sodium chlorite bleaching solutions contain special ingredients including anticorrosive agents, buffering agents, chlorine dioxide fume controllers, and surfactants. Anticorrosive agents are used to prevent the corrosion of stainless steel bleaching equipment. Buffer salts help liberate the chlorine dioxide that is produced during the bleaching process. Surfactants help stabilize solutions and allow for cleaning and penetration effects. Stabilized sodium chlorite solution can be stored for long periods without loss of activity. When the sodium chlorite is sold as a solid, sodium chloride is often included to make it safer to handle and store."

Create a 0.3% Chlorine Dioxide solution with Twin-Oxide two part powder system and treat up to 60,000l of potable water at up to 2ppm

Includes CD op. "APHIS uses antimicrobial products registered by EPA for use against influenza A viruses, and also uses the sterilant, chlorine dioxide, for disinfection of premises." "Chlorine dioxide, a frequently used gaseous sterilant for clean-up following an HPAI outbreak is a powerful oxidizer and unstable in light (HHS, 2004). Therefore, it is not expected to significantly impact air quality. When using chlorine dioxide and other disinfectants, label instructions should be followed to ensure proper use of the chemical and to minimize impacts to the environment"

There is increasing demand for safe and effective sanitizers for irrigation water disinfection to prevent transmission of foodborne pathogens to fresh produce. Here we compared the efficacy of pH-neutral electrolyzed oxidizing water (EOW), sodium hypochlorite ...

{Includes several links to CoronavirusCD.org}

ClorDiSys Solutions Inc blog about contamination control and biodecontamination.