CN104865246A - Method for detecting free residual chlorine in drinking water - Google Patents
Method for detecting free residual chlorine in drinking water Download PDFInfo
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- CN104865246A CN104865246A CN201510260932.4A CN201510260932A CN104865246A CN 104865246 A CN104865246 A CN 104865246A CN 201510260932 A CN201510260932 A CN 201510260932A CN 104865246 A CN104865246 A CN 104865246A
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Abstract
The invention discloses a method for detecting free residual chlorine in drinking water and belongs to the field of detection of disinfection by-products of the drinking water. According to the method, an oxidizing agent is added firstly to remove residual organic matters in the water, the content of the free residual chlorine in the water is guaranteed, an o-tolidine dihydrochloride solution is dropwise added to a standard residual chlorine solution to serve as a reagent, and the content of the residual chlorine in the water is calculated finally. The method has the benefits as follows: during detection, chemical reactions of the free residual chlorine with residual compounds in the water can be inhibited, the concentration of the free residual chlorine in the water can be accurately monitored, and the method has the characteristics of good stability, high sensitivity and high accuracy.
Description
Technical field
The present invention relates to a kind of detection method of potable water free chlorine, belong to the detection field of disinfection by-product of drinking water.
Background technology
When free chlorine refers to and exists without ammonia chlorine in water, the chlorine added exists with hypochlorous acid and hypochlorite state, this kind of chlorine residue oxidizing force and sterilizing ability strong, but its disinfecting power is not strong, and free chlorine easily contains nitrogen compound generation chemical reaction with ammonium and some produces into combined chlorine, extremely harmful to human body, this project is a very important sanitary index in Drinking Water, contents of residual chlorine in mensuration water and the state of existence, to carrying out drinking water disinfection work and ensureing that water hygiene safety is very important.
At present, having the free chlorine residual in 3 kinds of methods detection potable water, is DPD spectrophotometric method, TMB visual colorimetry and Portable belt chlorine residue instrument method respectively; First being DPD spectrophotometric method, by measuring chlorine residue in the absorbance log of particular range of wavelengths interior focusing, realizing the method for chlorine residue quantitative test, what it detected is limited to 0.01mg/L, there is good degree of accuracy, but all spectrophotometers not Portable belt, be not suitable for Site Detection; Next is TMB visual colorimetry, the method that the absorbance of relevant coloring matter under specific wavelength and residual chlorine concentration meet Lambert-beer's law is generated by chlorine residue and different developer effects, it detects and shows for 0.005mgL, be easy to carry, but the method is easily subject to the factor such as concentration, the nitrite concentration interference of sample acidity, iron; Be finally that Portable belt chlorine residue instrument method detects and is limited to 0.01mg/L, the chlorine residue instrument of use and test paper carrying portable, owing to not being listed in China's national standard detection method, are only used by water factory as self checking method.
Combined chlorine is produced into ammonium and some containing nitrogen compound generation chemical reaction in order to free chlorine residual is easy when solving detection, cause detecting the low problem of free chlorine residual content, the invention discloses free chlorine residual detection method in a kind of potable water, the residual compounds in free chlorine residual and water can be suppressed to carry out chemical reaction, and accurate measurements is to the concentration of the free chlorine residual in water.
Summary of the invention
The present invention can not suppress the residual compounds in free chlorine residual and water to carry out chemical reaction around current chlorine residue detection method, cause detecting the low problem of free chlorine residual content, provide free chlorine residual detection method in a kind of potable water, achieve and content free in water is accurately detected.
In order to achieve the above object, the technical solution adopted in the present invention is:
(1) take out mass concentration juice, be made into mass concentration and be respectively 20 ~ 60g/L concentrated hydrochloric acid, 40 ~ 80g/L o-tolidine solution, stirs, for subsequent use as indicator;
(2) by its mass ratio, the chlorine of 10-30%, the potassium permanganate of 25-40%, the hydrogen peroxide solution Homogeneous phase mixing of 30-65%, places 2-5 minute, preserves at the temperature of 10-25 degree Celsius;
(3) getting sodium hypochlorite is diluted in 25-100ml iodine flask, add 18-90mL potassium iodide, add the pure water of 75-500mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 2-5 minute, carry out titration with 0.1-0.5mol/L sodium sulphate, with the existing 5-10g/L starch prepared as indicator, calculate its concentration.
Application process of the present invention is: first by adding the method for oxygenant, remove the remaining organism in water, suppress the residual compounds in free chlorine residual and water to carry out chemical reaction, then drip hydrochloric acid o-tolidine solution in standard chlorine residue solution, calculate contents of residual chlorine.
The invention has the beneficial effects as follows: during detection, the residual compounds in free chlorine residual and water can be suppressed to carry out chemical reaction, and accurate measurements, to the concentration of the free chlorine residual in water, has good stability, and sensitivity is high, accuracy is high, characteristic simple to operate.
Embodiment
Preparation method
First take out mass concentration juice, be made into mass concentration and be respectively 20 ~ 60g/L concentrated hydrochloric acid, 40 ~ 80g/L o-tolidine solution, stirs, for subsequent use; Again by its mass ratio, the chlorine of 10-30%, the potassium permanganate of 25-40%, the hydrogen peroxide solution Homogeneous phase mixing of 30-65%, places 2-5 minute, preserves at the temperature of 10-25 degree Celsius; Getting sodium hypochlorite is again diluted in 25-100ml iodine flask, add 18-90mL potassium iodide, add the pure water of 75-500mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 2-5 minute, carry out titration with 0.1-0.5mol/L sodium sulphate, with the existing 5-10g/L starch prepared as indicator, calculate its concentration.
Application process
First by adding the method for oxygenant, removing the remaining organism in water, suppressing the residual compounds in free chlorine residual and water to carry out chemical reaction, then drip hydrochloric acid o-tolidine solution in standard chlorine residue solution, calculating free state contents of residual chlorine.
Example 1
First take out mass concentration juice, be made into mass concentration and be respectively 20g/L concentrated hydrochloric acid, 40g/L o-tolidine solution, stirs, for subsequent use; Again by its mass ratio, the chlorine of 10%, the potassium permanganate of 25%, the hydrogen peroxide solution Homogeneous phase mixing of 65%, places 2 minutes, preserves at the temperature of 10 degrees Celsius; Getting sodium hypochlorite is again diluted in 25ml iodine flask, add 18mL potassium iodide, add the pure water of 75mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 2 minutes, carry out titration with 0.1mol/L sodium sulphate, with the existing 5g/L starch prepared as indicator, calculating free state residual chlorine concentration is 0.4mg/L.
Under oxygenant service condition to water in free chlorine residual detect, eliminate disturbing factor, detect the contents of residual chlorine in water.
Example 2
First take out mass concentration juice, be made into mass concentration and be respectively 40g/L concentrated hydrochloric acid, 60g/L o-tolidine solution, stirs, for subsequent use; Again by its mass ratio, the chlorine of 30%, the potassium permanganate of 40%, the hydrogen peroxide solution Homogeneous phase mixing of 3%, places 3 minutes, preserves at the temperature of 15 degrees Celsius; Getting sodium hypochlorite is again diluted in 50ml iodine flask, add 40mL potassium iodide, add the pure water of 200mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 3 minutes, carry out titration with 0.5mol/L sodium sulphate, with the existing 10g/L starch prepared as indicator, calculating free state contents of residual chlorine is 0.8mg/L.
Under oxygenant service condition to water in free chlorine residual detect, eliminate disturbing factor, detect the contents of residual chlorine in water.
Example 3
First take out mass concentration juice, be made into mass concentration and be respectively 45g/L concentrated hydrochloric acid, 55g/L o-tolidine solution, stirs, for subsequent use; Again by its mass ratio, the chlorine of 25%, the potassium permanganate of 35%, the hydrogen peroxide solution Homogeneous phase mixing of 40%, places 4 minutes, preserves at the temperature of 25 degrees Celsius; Getting sodium hypochlorite is again diluted in 80ml iodine flask, add 85mL potassium iodide, add the pure water of 400mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 4 minutes, carry out titration with 0.4mol/L sodium sulphate, with the existing 8g/L starch prepared as indicator, calculating free state contents of residual chlorine is 1.2mg/L.
Under oxygenant service condition to water in free chlorine residual detect, eliminate disturbing factor, detect the contents of residual chlorine in water.
Claims (3)
1. a free chlorine residual detection method in potable water, is characterized in that:
(1) by mass concentration, be made into mass concentration and be respectively 20 ~ 60g/L concentrated hydrochloric acid, 40 ~ 80g/L o-tolidine solution, stirs, for subsequent use;
(2) by its mass concentration, be made into the potassium permanganate of 25-40%, the hydrogen peroxide solution Homogeneous phase mixing of 30-65%, place 2-5 minute, preserve at the temperature of 10-25 DEG C.
(3) getting sodium hypochlorite is diluted in 25-100ml iodine flask, add 18-90mL potassium iodide, add the pure water of 75-500mL again, shake iodine flask, makes potassium iodide dissolve, and injection iodine flask mixes opens in dark place, leave standstill 2-5 minute, carry out titration with 0.1-0.5mol/L sodium sulphate, with the existing 5-10g/L starch prepared as indicator, calculate its concentration.
2. free chlorine residual detection method in a kind of potable water according to claim 1, is characterized in that: described oxygenant is potassium permanganate and hydrogen peroxide, by its mass ratio, and the potassium permanganate of 25-80%, the hydrogen peroxide of 30-65%.
3. free chlorine residual detection method in a kind of potable water according to claim 1, is characterized in that: described o-tolidine solution is hydrochloric acid o-tolidine solution.
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| CN201510260932.4A CN104865246A (en) | 2015-05-20 | 2015-05-20 | Method for detecting free residual chlorine in drinking water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770252A (en) * | 2016-12-31 | 2017-05-31 | 郑州贯奥仪器仪表有限公司 | A kind of Remanent Chloride In Drinking Water detection reagent and its application |
| CN108982487A (en) * | 2018-06-08 | 2018-12-11 | 铃木加普腾钢丝（苏州）有限公司 | A kind of steel wire hardened line chloride test device and method |
| CN110286196A (en) * | 2019-07-24 | 2019-09-27 | 浙江师范大学 | A method of with quick, Accurate Determining drinking water chlorine residue on site |
| CN111638211A (en) * | 2020-06-11 | 2020-09-08 | 山东信发化工有限公司 | Method for detecting chlorate in brine of electrolytic cell |
| CN113514454A (en) * | 2021-06-21 | 2021-10-19 | 宜都市友源实业有限公司 | Method for detecting free residual chlorine in chlorine-containing organic chemical products |
| CN115436130A (en) * | 2022-09-02 | 2022-12-06 | 中国计量科学研究院 | Standard substance for simulating free residual chlorine and preparation method thereof |
-
2015
- 2015-05-20 CN CN201510260932.4A patent/CN104865246A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770252A (en) * | 2016-12-31 | 2017-05-31 | 郑州贯奥仪器仪表有限公司 | A kind of Remanent Chloride In Drinking Water detection reagent and its application |
| CN108982487A (en) * | 2018-06-08 | 2018-12-11 | 铃木加普腾钢丝（苏州）有限公司 | A kind of steel wire hardened line chloride test device and method |
| CN110286196A (en) * | 2019-07-24 | 2019-09-27 | 浙江师范大学 | A method of with quick, Accurate Determining drinking water chlorine residue on site |
| CN111638211A (en) * | 2020-06-11 | 2020-09-08 | 山东信发化工有限公司 | Method for detecting chlorate in brine of electrolytic cell |
| CN113514454A (en) * | 2021-06-21 | 2021-10-19 | 宜都市友源实业有限公司 | Method for detecting free residual chlorine in chlorine-containing organic chemical products |
| CN115436130A (en) * | 2022-09-02 | 2022-12-06 | 中国计量科学研究院 | Standard substance for simulating free residual chlorine and preparation method thereof |
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