1）Determination of free residual chlorine in drinking water.

2）Determination of residual chlorine in artificial swimming pool water.

3）Determination of residual chlorine concentration on the surface of utensils disinfected with chlorine-containing decontamination agent in catering industry.

[Operation method]

1）Add water samples to both the narrow and wide pools of the colorimetric dish up to the mark,

2）Put a reagent into a narrow pool, cover it, and shake it up and down for about 60 seconds.

3）Stand still for about 10 seconds (no more than 60 seconds) to precipitate the undissolved particles,

4）Use a hollowed out board to find the same or similar color scale on the narrow pool and the color chart. The reading on this color scale is the content of free residual chlorine in the water sample in ppm (mg/L).

5）If the reading exceeds 1.0mg/L, take 1.0ml of water sample into a narrow pool, dilute with pure water to the 10ml mark, and then measure. The reading result is multiplied by 10 to obtain the residual chlorine content in the water in ppm (mg/L).

[Notes] When the chlorine concentration is too high, the test solution is yellow or not colorless. The sample solution should be diluted before measuring, and the reading result should be multiplied by the dilution multiple.

[Product Storage] Reagents should be stored under closed light, at room temperature, or refrigerated,

Produced by Beijing Shian Xunda Technology Co., Ltd., China

E-mail：bjzw@vip.163.com