Total Hardness Method:

1) Rinse the test tube with the water to be tested. And fill to the 5 ml mark.

2) Add 2 drops MB Indicator (Eriochrome Black T), place the stopper and shake it.

3) If color is blue, there is no hardness in the water to be tested.

4) If color is pink, add Total Hardness Titration Solution drop by drop until color changes pink to blue again.

5) Total drops of hardness titration solution =Total French Hardness of water to be tested.

6) Each drop of titration solution is equal to one French hardness degree.

Note: 1 Fr0 =10 mg/l(ppm) CaCO3 =0,2 epm =0,2 mval/ l

1 epm = 50 mg/l(ppm) CaCO3 = 1 mval/l


1) Remove only as many test strips as are required. Close the container immediately after removing a strip. Do not touch the test field.

2) Dip the test strip into the test solution (pH 2-12) for 1 sec.

3) Shake off excess liquid.

4) Wait 60 sec.

5) Compare with the color scale. If nitrite ions are present,the test field turns orange to red.


Measuring range:0.1-3 g/L NO2-,100-3000 PPM NO2


Color Gradation:        0=0 PPM NO2

0.1=100 PPM NO2

0.3=300 PPM NO2

0.6=600 PPM NO2

1=1000 PPM NO2

2=2000 PPM NO2

3=3000 PPM NO2


Chloride (Sensitivity 1 drop = 30 mg/l (ppm)) Method :

1) Rinse the test tube with the water to be tested and fill it using 5 ml injector.

2) Add 3 drops Chloride Indicator Solution and color change to yellow

3) Add Silver Nitrate Solution drop by drop until color changes to reddish brown.

4) Total drops of titration solution x 30 = Concentration of chloride (Cl-) in mg/l(ppm)


Use pH papers (0-14).