A method for detecting chlorine dioxide content in life drinking water

A technology of domestic drinking water and chlorine dioxide, which is applied in the direction of chemical analysis using microanalysis, etc., can solve the problems of inaccurate chlorine dioxide content, unfavorable wide use, and insufficient sensitivity, so as to eliminate other ion interference, suitable for promotion, The effect of easy operation

Inactive Publication Date: 2009-09-16
隆昌山川机械有限责任公司
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Problems solved by technology

However, these methods are only practical for units with good infrastructure, and the detection limit is high, and the sensitivity is not enough, which is not conducive to widespread use
[0003] Among them, the iodometric method is relatively simple to operate, but it is easily interfered by other ions, and the detected chlorine dioxide content is not accurate enough.
Because there are many by-products of chlorine dioxide, the chlorine dioxide measured by the general iodometric method may contain its by-product ClO 2 - (chlorite ion), ClO 3 - (chlorate ion), etc., so the content of chlorine dioxide cannot be measured more accurately

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Eliminate the decontaminant chlorine dioxide powder, prepare 12 parts of aqueous solutions of different concentrations respectively, calculate its theoretical concentration (see the table below), adopt the inventive method comprising following major steps to detect wherein the content of chlorine dioxide:

[0045] (1), the first titration:

[0046] Add phosphate buffer solution (containing 0.025mol / L KH 2 PO 4 and 0.025mol / L Na 2 HPO 4 .12H 2 O;) About 1ml;

[0047] Then add 10-200 ml of water samples (12 aqueous solution samples with different concentrations prepared above), and the pH of the solution is about 7.0 at this time;

[0048] Then add about 1 g of potassium iodide particles and shake to make potassium iodide and ClO in the water sample 2 , ClO 2 - , Cl 2 and other oxidizing substances; since the chlorine dioxide content in drinking water is very low, there is no obvious reaction at this time;

[0049] Add about 1ml of starch indicator solution with a...

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PUM

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Abstract

The invention discloses a method for detecting chlorine dioxide content in life drinking water, which includes: measuring ClO2 homologous to four fifth of the total amount residual and the total by a first titration; and then measuring all the ClO2[-] in the water sample by a second titration. The method adopts chemical analysis to detect chlorine dioxide content in water, can effectively exclude other ion interference, avoids affection of accessory substances ClO2[-], ClO3[-] and the like ions, thereby accurately detecting the content of chlorine dioxide in the life drinking water; the minimum detection amount of ClO2[-] can achieve 0.02mg, the minimum detectable amount of ClO2 can achieve 0.08mg / L; moreover, the method has simple operation, and suitable promotion.

Description

technical field [0001] The invention relates to the technical field of detecting the content of chlorine dioxide as a disinfectant, in particular to a method for detecting the content of chlorine dioxide in drinking water. Background technique [0002] Chlorine dioxide is a broad-spectrum bactericidal disinfectant, which has achieved good results in many fields. At present, the main detection method for disinfectant chlorine dioxide in China is to use monitoring equipment to detect automatically, but the equipment is expensive. In addition, there are amperometric titration, iodometric titration, UV-visible spectrophotometry, flow injection analysis, polarography and so on. However, these methods are only practical for units with good infrastructure, and the detection limit is high, and the sensitivity is not enough, which is not conducive to widespread use. [0003] Among them, the iodometric method is relatively simple to operate, but it is easily interfered by other ions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/20
Inventor 杜超
Owner 隆昌山川机械有限责任公司
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