Determination Of Chlorine Dioxide Research Articles

Research on Rapid Determination of Total Chlorine and Chlorine Dioxide by DPD Method in Drinking Water

Chlorine and chlorine dioxide are widely used for water disinfection nowadays. To establish standard technical process for total chlorine and chlorine dioxide determination, the factors affected total chlorine and chlorine dioxide determination by DPA method were researched in this paper. Temperature should be balanced at 20℃ in determination and pH value should be controlled between 5 and 9. The reaction time should be controlled within 5 minutes for the best results. The interference of metal ions can be eliminated by adding glycine or potassium iodide solution in determination of chlorine dioxide. The results using this method showed no significant difference with using the method GB/T 5749-2006. The research provides support on establishing the standard technical process for rapid determination of total chlorine and chlorine dioxide in drinking water.

The Use of Naphthol Green for the Determination of Chlorine Dioxide in Water

The determination of chlorine dioxide using Naphthol Green was investigated in the presence of various chlorinated species that can occur under normal water treatment conditions. Ammonium sulfamate (0.75 mol L−1) was used as a masking agent. Naphthol Green selectively reacts with 0–13 mg L−1 ClO2 at pH 9, yielding a linear response (0.9991) with a limit detection of 0.1 mg L−1 ClO2. Several species, , , ClO−, and free available chlorine (FAC), were studied as potential interferents using this method. There was found to be less than 2% interference due to 85 mg L−1 FAC, 23 mg L−1 ClO− and excess of other oxychlorine species could be tolerated without interference.

The Determination of Chlorine Dioxide in the Presence of other Oxychlorine Species

(1999). The Determination of Chlorine Dioxide in the Presence of other Oxychlorine Species. Transactions of the IMF: Vol. 77, No. 4, pp. 145-148.

An on-line determination of chlorine dioxide using chlorophenol red by gas diffusion flow-injection analysis

An on-line determination of chlorine dioxide (ClO2) in potable water using chlorophenol red (CPR) by gas diffusion flow-injection analysis (FIA) was investigated in the presence of various chlorinated species that can occur under normal water-treatment conditions. A gas diffusion membrane is used to separate the donor (sample) stream from the acceptor (detecting) stream (the donor stream transports the sample stream to the membrane separate device, and the acceptor stream collects all of the penetrated analytes and transports quantitatively to the detector) and makes it possible for this method to eliminate interference from metal ions, as well as other oxychlorinated compounds such as chlorite and chlorate. The system is more selective for chlorine dioxide than chlorine. The linear range of ClO2 concentration is 0–0.5 mg·mL−1 with a detection limit of 0.02 μg·mL−1 (S/N = 3) and a sampling frequency of 50 h−1. © 1999 John Wiley & Sons, Inc. Lab Robotics and Automation 11: 157–161, 1999

Determination of chlorine dioxide using 4-aminoantipyrine and phenol by flow injection analysis

The determination of chlorine dioxide (ClO 2) using 4-aminoantipyrine (4-AA) and phenol by flow injection analysis, was investigated in the presence of various chlorinated species that can occur under normal water-treatment conditions. The colorimetric method with 4-AA and phenol relies on the use of a Tris-HCl buffer. Adjusting the reagent to pH 9.0 with the Tris-HCl buffer gives high sensitivity and is effective in eliminating hypochlorite interference. Furthermore, using purge trap system for pretreatment makes it possible for this method to eliminate interferences from metal ions, as well as other oxychlorinated compounds, such as chlorite and chlorate.

Determination of Chlorine Dioxide in Process Gas with a Large Excess of Chlorine by a Voltammetric Membrane Electrode.

Chlorine dioxide (ClO2) in a gas exhausted from a factory involved in the electrolytical soda process was measured. Three absorbing vessels connected in series were used for the simultaneous collection of ClO2 and chlorine. Two vessels contained water to collect ClO2 and coexisting chlorine, and the third one contained dimethylsulfoxide (DMSO) to capture ClO2. DMSO was useful as an absorbing solution for ClO2, because more ClO2 was captured and remained in DMSO than in water. Moreover, DMSO eliminated interference from the coexisting chlorine. ClO2 collected in water was determined by a voltammetric membrane electrode after the addition of DMSO. Chlorine was determined by colorimetry using o-tolidine. The concentrations of ClO2 and chlorine in process gases ranged from 36 to 116 mg/m3 and from 16 to 51 g/m3, respectively.

An Evaluation of the Occupational Health and Safety Administration Method for the “Determination of Chlorine Dioxide in Workplace Atmosphere”

Findings of a study to evaluate the Occupational Safety and Health Administration (OSHA) ion chromatography Method 202 for chlorine dioxide are presented. The OSHA method was chosen for in-depth evaluation because it appeared to offer specificity and sensitivity in the presence of chlorine gas. This study critically evaluates the effects of chlorine, sulfur dioxide, and the pH of the collection solution as related to the recovery of chlorine dioxide as the chlorite ion. Results show that the buffer pH should be maintained above pH 9.5 and chlorine concentration below 20 µg.

An Evaluation of the Occupational Health and Safety Administration Method for the “Determination of Chlorine Dioxide in Workplace Atmosphere”

An Evaluation of the Occupational Health and Safety Administration Method for the “Determination of Chlorine Dioxide in Workplace Atmosphere”

Determination of chlorine dioxide in potable waters using chlorophenol red.

The determination of chlorine dioxide using chlorophenol red was investigated in the presence of various chlorinated species that can occur under normal water treatment conditions. Previously published methods employing chlorophenol red were found to be subject to unreported and significant interference from free chlorine (hypochlorous acid).Glycine, ammonium sulphate and sodium cyclamate were investigated as possible reagents to suppress this interference. Glycine was found to be an unsuitable reagent owing to the direct reaction with chlorine dioxide. Sodium cyclamate yielded the best performance. When combined with the addition of thioacetamide after chlorophenol red, free chlorine concentrations up to 20 mg l–1 could be tolerated without interference.The finalised procedure employing sodium cyclamate and thioacetamide is simple, selective for chlorine dioxide in the presence of other chlorinated species and has a range suitable for the determination of the low concentrations of chlorine dioxide employed in potable water treatment.

Determination of Chlorine Dioxide, Chlorine, Chlorite, and Chlorate in Water

This article describes a procedure for either amperometric or potentiometric determination of iodine formed by the oxidation of iodide by chlorine dioxide, chlorine, chlorite, and chlorate. Either phenylarsine oxide or sodium thiosulfate can be used as the titrant. Sample pretreatment and pH adjustment are used to differentiate among the various chlorine species.

Determination of Chlorine Dioxide in Treated Surface Waters

Determination of Chlorine Dioxide in Treated Surface Waters

Determination of Chlorine Dioxide and Other Active Chlorine Compounds in Water

Determination of Chlorine Dioxide and Other Active Chlorine Compounds in Water