Water disinfection is done by chlorine for which either bleaching powder or liquid chlorine is used. For safe drinking water, it is must that water should be treated with a proper amount of chlorinating agent. The excess or inadequate quantity of chlorinating agent results in quantity will not kill all pathogenic many problems. An inadequate present in water while the excess quantity of chlorinating microorganism agent leaves a strong pungent odour in the water and also make the water unpalatable for drinking. Excess chlorination also results in gastric irritation and other problems in body. Health Authorities, For above reasons all Water Works Departments, tests the chlorinated water for its Municipalities, Gram Panchayats chlorine content.
Ltek's Chlorine Tester (Chloroscope):
To overcome these problems, LTEK has developed a simple compact, handy Chlorine Tester, which can be used by a layman.
O.T liquid is acidic in nature. Handle it carefully. If falls on hand, wash it immediately. Do not inhale it.
Estimation of Chlorine with the help of Ltek's Chlorine Tester:
The 'Chlorine Tester' uses the Acid Orthotolidine Method to determine the chlorine concentration in water. The test is based on the fact that when one or two drops of Orthotolidine reagent are added to a test tube containing the sample of chlorinated water, the water sample develops yellowish colour. The depth of developed yellow colour depends upon the chlorine content in the water sample.
Procedure to use Chlorine Tester:
Fill the water to be tested in transparent plastic/glass tubes.
Insert this third tube in the middle hole of chloroscope.
Keep one tube in right hole & another in left hole.
Close Chloroscope with the cap, yellow colour in the middle
In the third tube put two drops of O.T liquid & shake. lf chlorine is present then it will turn yellow
Obtained yellow colour in the middle tube, compare it with standard level and note the reading.
Keep away from light & moisture. Standard filter is likely to fed if not properly stored.
The yellow colour of this water sample in the test tube is compared with the colour standards in the chloroscope. Each colour standard in the chloroscope is labelled with the correct degree of chlorine concentration it represents such as 2.5 ppm, 2.0 ppm., 1.5 ppm, 1.0 ppm, 0.5 ppm, 0.2 ppm, 0.1 ppm and 0.0 ppm. The intensity of colour increases with an increase in the ppm figure. Thus by comparison with the colour standards in the chloroscope one can measure in ppm the chlorine content of the water sample. It is so easy to use the chlorine tester that even a layman himself can carry out the above test for chlorine content in water.
For proper chlorination of water, it is desirable that 0.2 ppm of residual chlorine should be present in the treated water