L1 /
15
CH3041
EPA STANDARD
TITRATIONS
1Acid-Base
Total Acidity NaOH – pH8.2 (Ph.)
Total Alkalinity HCl – pH4.3 (M.O.)
2Redox titration Sulphide,
Sulphite
(Iodometric I- ® I2)
(Iodometric I- ® I2)
3Complexiometric Hardness with
EDTA
4Turbidimetric Sulphate with Ba2+
3. Ca2+ in water reacts with a known [EDTA].
4. The [SO42-]
in water is determined by measuring the turbidity
of water with a
turbidimeter (transmittance) – units NTU.
(NTU = Normal Turbidity Units)
turbidimeter (transmittance) – units NTU.
(NTU = Normal Turbidity Units)
• When [Ba2+] is added to SO42-(aq) ®BaSO4(s) a
suspension forms, the turbidity increases until the equivalence point
& then is stable.
