Lovibond Tintometer MD 100 Manual De Instrucciones página 18

Chemical Method
Phenol Red
Appendix
Interferences
Removeable Interferences
1. Salt error Correction of test results (average values) for samples with salt contents
of:
2.
Salt content of the sample
30 g/l (seawater)
60 g/l
120 g/l
180 g/l
according to Kolthoff (1922)
1)
3. When testing chlorinated water the residual chlorine contents can influence the
colour reaction of the liquid reagent. This can be avoided by adding a small crystal
of Sodiumthiosulphate (Na
PHENOL RED solution.
Bibliography
Colorimetric Chemical Analytical Methods, 9th Edition, London
EN Method Reference Book 1.0
Correction
-0.15
-0.21
-0.26
-0.29
according to Parson and Douglas
2)
(1926)
S O ⋅5 H O) to the sample solution before adding the
2 2 3 2
pH value L / M331
1)
2)
2)
2)
EN
19