Rapid detection of residual chlorine of disinfectant in water
(instructions for use of residual chlorine rapid measuring tube)
1 scope of application: This product is applicable to the rapid detection of residual chlorine content after or during disinfection of swimming pool water, swimming pool foot soaking disinfection water, domestic drinking water, etc.
2 method principle: This product adopts DPD color development method, with high sensitivity, clear color and stable results. The detection range is 0~10mg / L, and the detection limit is 0.1mg/l.
3 operation method: take 1ml of the liquid to be tested into the rapid test tube containing solid reagent, shake the reagent, stand the rapid test tube upside down on the control color card, compare it with the color card within 3 ~ 5min, and find the same or similar color scale. The value marked under the color scale is the content of residual chlorine in the water sample, mg / L.
4 precautions: if the solution to be tested contains more than 0.1mg/l residual chlorine, the solution will change color, and the color depth of the solution is directly proportional to the residual chlorine content. When the residual chlorine content is high, the solution will become purplish red and finally purple. If it is found that part of the tube shows purplish red after sample addition and fades rapidly, it indicates that the chlorine content in the water may greatly exceed the upper limit of the detection tube. It is recommended to dilute it 10 ~ 1000 times before testing.
5 standard provisions:
5.1 the limit value of residual chlorine in the finished water of domestic drinking water and the end water of pipe network shall be ≤ 2mg / L, the residual chlorine in the finished water shall be ≥ 0.3mg/l, and the residual chlorine in the end water of pipe network shall be ≥ 0.05mg/l.
5.2 the residual chlorine in the water of artificial swimming pool shall be kept at 0.3 ~ 0.5mg/l.
5.3 the residual chlorine in the pool water should be kept at 5 ~ 10mg / L.
6 Product configuration: 30 detection tubes, 5 suction tubes (washed and reused), and 1 color card.
7 product storage and expiration date: the reagent is stored in closed light and cold storage, and the expiration date is 16 months.
（余氯速测管使用说明）（参照GB/T 5750.11 DPD法）