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Method for rapidly and accurately determining residual chlorine in drinking water on site

A technology for accurately measuring and drinking water, which is applied in the direction of chemical analysis by titration, can solve the problems of inconvenient portability of titration equipment, time-consuming measurement, and more time-consuming, so as to save reagents and accurately measure water. Same time, easy to carry effect

Inactive Publication Date: 2019-09-27
ZHEJIANG NORMAL UNIVERSITY
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  • Claims
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Problems solved by technology

The disadvantages of the traditional DPD titration method are as follows: 1. The titration equipment (burette, iron stand) is inconvenient to carry, and it is easy to be damaged during the carrying; 2. When measuring 100mL water samples on site, other equipment such as burettes are also required. Assistance, it is time-consuming to measure; 3. 5mL buffer and 5mL DPD reagents are used in large quantities, and 2 bottles of reagents (buffer and DPD), pipette gun, nozzle, and then pipetting are required during on-site operation , takes more time

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  • Method for rapidly and accurately determining residual chlorine in drinking water on site

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Embodiment Construction

[0015] 1. The burette is replaced by a pipette gun (10-100µL), which is easy to carry, and its minimum measurement level is 10µL, which is 4 times smaller than the minimum measurement unit of the burette, 1 drop (50µL), which greatly increases the measurement accuracy Spend;

[0016] 2. 5mL buffer solution and 5mL DPD reagent are replaced by 2mL buffer solution and 2mL DPD reagent, which not only saves reagents and reduces pollution, but also uses 2mL centrifuge tubes for subpackaging in the laboratory in advance, which is not only convenient to carry, but also saves A series of steps and procedures for pipetting on site temporarily;

[0017] 3. Since 5mL buffer solution and 5mL DPD can be used to determine the residual chlorine concentration in 100mL water samples in the traditional titration method, then 2mL buffer solution and 2mL DPD can be used to determine the residual chlorine concentration in 40mL (or less than 40mL) water samples. Since it is time-consuming to take a...

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Abstract

The invention discloses a method for rapidly and accurately determining residual chlorine in drinking water on site. The method comprises the following steps: sequentially adding 2mL of a buffer solution contained in a 2mL centrifuge tube, 2mL of DPD contained in a 2mL centrifuge tube and a water sample with a fixed volume, which is sampled by and full of a fixed test tube into a 100mL conical flask; then transferring 2.8 mmol / L ammonium ferrous sulfate standard solution by using a pipette and carrying out titration: firstly titrating by taking 100 mu L and 50 mu L as units, titrating by taking 20 mu L and 10 mu L as units when the color is faded, finally recording the total titration volume V1; finally realizing rapid and accurate determination of the residual chlorine concentration in the water sample according to a formula. The method has the advantages of being convenient to carry, accurate in measurement, wide in measurement range, time-saving, medicament-saving and the like.

Description

technical field [0001] The invention belongs to the technical field of measuring methods for residual chlorine in drinking water, and in particular relates to a method for quickly and accurately measuring residual chlorine in drinking water on site. Background technique [0002] Chlorination disinfection is currently the most common drinking water disinfection method in my country, and in order to ensure the sanitation and safety of tap water, the state stipulates that the limit value of residual chlorine in factory water is 4mg / L, not less than 0.3mg / L, and the terminal water is not less than 0.05mg / L. The determination of residual chlorine is usually carried out by DPD (N,N-diethyl-1,4-phenylenediamine) titration method or DPD photometric method. For details, see "Water and Wastewater Monitoring and Analysis Methods", Fourth Edition. The titration method must use titration equipment (the principle is that free chlorine reacts with DPD at pH=6.2-6.5 to form a red compound, ...

Claims

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Application Information

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IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 洪华嫦孙洪杰代晓云施佳燕孙芸吴抽叶
Owner ZHEJIANG NORMAL UNIVERSITY
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