Rapid detection of free residual chlorine and available chlorine in disinfectant

1.

[Detection principle]

In chlorinated drinking water in the pipe network, after chlorinating for 30 minutes, the content of free residual chlorine in the water should not be less than 0.

The free residual chlorine content of the water towel at the end of the pipe network should not be less than 0.

The standard value of free residual chlorine in artificial swimming pool water is 0.

The content of free residual chlorine on the surface of food (drinking) utensils disinfected with chlorine-containing disinfectants should be less than 0.

(1) Determination of drinking water and artificial swimming pool water.

(2) Determination of free residual chlorine on the surface of food (drinking) utensils After detoxification of food (drinking) utensils bowls, plates, plates, cups, wine glasses, etc.

Note: The specific operation can be found in the instruction manual of the instrument

2.

(1) Available chlorine test paper method

[principle]

This method is suitable for testing various chlorine-containing disinfectants, including chlorine dioxide

[Operation method]

Remove the film on the tablet, insert the test paper into the test solution soaked and take it out, shake off the excess water, wait a while, after the test paper is stable, compare it with the standard color palette to determine the available chlorine content

(2) Chlorine test paper method

[principle]

Chlorine disinfectant is currently the most widely used disinfectant

The reaction range of the test paper: 10~50000mg/kg

[Operation method]

During the test, hold the test paper box with one hand, press the test paper with the thumb at the exit, and pull out the paper strip with the other hand, and cut it off on the chagrin tooth.

[Measurement solution concentration correction (adjustment) method]

(1) When the concentration of the prepared disinfectant is lower than the requirement, the amount of medicine to be added is calculated by the following formula, and the test paper is used to retest after preparation

(2) When the preparation concentration is higher than the requirement, the dilution method can be used to add water to adjust as follows:

(3) Rapid determination of the chlorine content of the original disinfectant solution or original powder in emergency situations: Take 1g of powder or 10mL of water solution and dissolve it in 1000mL of water, test with test paper, and obtain the following formula:

That is, the powder test result is divided by 10, and the water agent is divided by 100 to get the chlorine content of the mass fraction
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This method is also suitable for the preparation concentration test of the sodium hypochlorite generator and the preliminary experiment in the chemical analysis of the product
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When preparing effective chlorine disinfectant, it should be carried out according to the steps of "preliminary preparation-test-calibration-retest"
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The application solution concentration for different purposes can be prepared by referring to the attached table (Table 8-1)
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The disinfection time is for reference for the immersion disinfection method
.

Table 8-1 Effective chlorine concentration and disinfection time of disinfection objects

[Description]

The chlorine content detector can also be used for detection.
For specific operations, please refer to the instruction manual
.

Related links: rapid determination of food center, frying oil and ambient temperature